J/ApJ/903/96 The µTau Association (MUTA) (Gagne+, 2020)
The µTau Association: a 60 Myr old coeval group at 150pc from the Sun
Gagne J., David T.J., Mamajek E.E., Mann A.W., Faherty J.K., Bedard A.
<Astrophys. J., 903, 96 (2020)>
=2020ApJ...903...96G 2020ApJ...903...96G
ADC_Keywords: Associations, stellar; Stars, brown dwarf; Proper motions;
Radial velocities; Parallaxes, trigonometric; Optical;
Photometry, infrared
Keywords: Astrometry ; Stellar associations ; Proper motions ; Brown
dwarfs ; Stellar kinematics ; Low mass stars
Abstract:
We present an analysis of the newly identified µTau Association
(MUTA) of young stars at ∼150pc from the Sun that is part of the large
Cas-Tau structure, coeval and comoving with the αPersei cluster.
This association is also located in the vicinity of the Taurus-Auriga
star-forming region and the Pleiades association, although it is
unrelated to them. We identify more than 500 candidate members of MUTA
using Gaia DR2 data and the BANYAN Σ tool, and we determine an
age of 62±7Myr for its population based on an empirical comparison
of its color-magnitude diagram sequence with those of other nearby
young associations. The MUTA association is related to the Theia 160
group of Kounkel & Covey and corresponds to the e Tau group of Liu et
al. It is also part of the Cas-Tau group of Blaauw. As part of this
analysis, we introduce an iterative method based on spectral templates
to perform an accurate correction of interstellar extinction of Gaia
DR2 photometry, needed because of its wide photometric bandpasses. We
show that the members of MUTA display an expected increased rate of
stellar activity and faster rotation rates compared with older stars,
and that literature measurements of the lithium equivalent width of
nine G0- to K3-type members are consistent with our age determination.
We show that the present- day mass function of MUTA is consistent with
other known nearby young associations. We identify WD0340+103 as a
hot, massive white dwarf remnant of a B2 member that left its
planetary nebula phase only 270000yr ago, posing an independent age
constraint of 60-6+8 Myr for MUTA, consistent with our isochrone
age. This relatively large collection of comoving young stars near the
Sun indicates that more work is required to unveil the full kinematic
structure of the complex of young stars surrounding α Persei and
Cas-Tau.
Description:
This paper presents the discovery and characterization the µTau
Association (MUTA) association, based on an initial list of massive
comoving and coeval members that had been discovered in historical
surveys but have never before been published. The advent of Gaia DR2
allowed us to complete this list and characterize MUTA such that it
will become yet another important laboratory for the investigation of
stellar evolution and the grounds for discovery of age-calibrated
brown dwarfs and exoplanets.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 88 33 Initial members of MUTA
table2.dat 69 25 Core members of MUTA used in the construction of a
kinematic model
table3.dat 116 503 List of new candidate members of MUTA identified in
Gaia DR2 with BANYAN Σ
table4.dat 147 56 Wide multiple systems recovered in MUTA
table5.dat 56 33 MUTA objects in common with Oh+, 2017, J/AJ/153/257
table6.dat 140 32 Wide multiple candidate systems in MUTA visually
identified but not recovered in Section 4.1.
table10.dat 56 10 Lithium equivalent width measurements for MUTA
table11.dat 66 201 TESS and K2 potation periods
table12.dat 677 566 Main list of all systems of interest to MUTA
identified in this work
--------------------------------------------------------------------------------
See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
III/23 : MK Classification for OB Stars (Lesh 1968)
III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
III/231 : The Tycho-2 Spectral Type Catalog (Wright+, 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
III/254 : 2nd Cat. Radial Velocities with Astrometric Data (Kharchenko+, 2007)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/359 : The VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+AS/124/449 : Young stars south of Taurus-Auriga (Magazzu+ 1997)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/A+AS/137/451 : Radial velocities. IX. (Grenier+, 1999)
J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)
J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)
J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)
J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006)
J/AN/328/889 : Mean Radial Velocities of open clusters (Kharchenko+, 2007)
J/AJ/133/2524 : Spectra of young nearby stars (White+, 2007)
J/ApJS/176/216 : MK spectral types of Visual Multiples (Abt, 2008)
J/A+A/508/355 : Scaled solar tracks and isochrones (Bertelli+, 2009)
J/AN/331/349 : O, B-type & red supergiant masses luminosities (Hohle+, 2010)
J/ApJ/723/1542 : Optical high-resolution spectroscopy of WTTSs (Xing, 2010)
J/MNRAS/413/2218 : Stellar rotation in Hyades and Praesepe (Delorme+, 2011)
J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)
J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)
J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)
J/ApJ/753/156 : T/Y brown dwarfs with WISE photometry (Kirkpatrick+, 2012)
J/AJ/143/93 : Rotational velocities in early-M stars (Reiners+, 2012)
J/AN/334/860 : Catalogue eclipsing variables. Version 2 (Avvakumova+, 2013)
J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)
J/ApJ/762/88 : Young stellar kinematic group candidate members (Malo+, 2013)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/783/121 : BANYAN II. Nearby young assoc. candidate member (Gagne+, 2014)
J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)
J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)
J/A+A/575/A120 : DANCe study of M35 (NGC 2168) (Bouy+, 2015)
J/ApJ/810/158 : M,L,T dwarfs fundamental parameters & SEDs (Filippazzo+, 2015)
J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)
J/A+A/588/A103 : Second ROSAT all-sky survey source catalog (Boller+, 2016)
J/ApJ/822/47 : K2 rotation periods for 65 Hyades members (Douglas+, 2016)
J/ApJS/225/10 : Kinematic analysis of M7-L8 dwarfs (Faherty+, 2016)
J/AJ/152/40 : Spectroscopy of 341 bright A-& B-type stars (Gullikson+, 2016)
J/ApJ/833/96 : Hawaii infrared plx program. II. Ultracool dwarfs (Liu+, 2016)
J/AJ/152/113 : Pleiades members K2 light curves. I. Periods (Rebull+, 2016)
J/ApJ/842/83 : Praesepe members rotational periods K2 LCs (Douglas+, 2017)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/AJ/153/95 : Catalog of Suspected Nearby Young Stars (Riedel+, 2017)
J/AJ/154/69 : ACRONYM II. The β Pictoris Moving Group (Shkolnik+, 2017)
J/A+A/616/A10 : 46 openclusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/A+A/613/A63 : Lithium content for 148 Pleiades stars (Bouvier+, 2018)
J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia DR2 (Gagne+, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/ApJ/860/43 : BANYAN. XII. New members from Gaia-Tycho data (Gagne+, 2018)
J/MNRAS/480/1547 : Full Evolutionary Sequences of Massive WDs (Lauffer+, 2018)
J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)
J/MNRAS/477/3197 : Radial velocities of Hyades members (Reino+, 2018)
J/A+A/616/A7 : Gaia DR2 radial velocity std stars catalog (Soubiran+, 2018)
J/AJ/158/93 : Regression of stellar Teff in GaiaDR2 (Bai+, 2019)
J/A+A/625/A87 : Ultra-massive white dwarfs evolution models (Camisassa+, 2019)
J/AJ/158/77 : Cand. & members of the Pisces-Eridanus stream (Curtis+, 2019)
J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)
J/AJ/158/122 : Local structure & star formation history of MW (Kounkel+,2019)
J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)
J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)
J/A+A/627/A4 : Praesepe (NGC 2632) and its tidal tails (Roeser+, 2019)
J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)
J/ApJ/877/12 : Coma Ber & a Neighbor Stellar Group tidal tails (Tang+, 2019)
J/AJ/159/105 : 2 new stellar associations in vicinity of the Sun (Liu+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- MUTA [1/30] MUTA identification number
4- 4 A1 --- Comp Binary component
6- 28 A23 --- Name Main target name
30- 34 A5 --- SpT Literature Spectral Type
36- 37 I2 h RAh [03/04] Hour of Right Ascension (ICRS, 2015.5)
39- 40 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
42- 47 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
49- 49 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
50- 51 I2 deg DEd Degree of Declination (ICRS, 2015.5)
53- 54 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
56- 60 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
62- 66 F5.1 pc Dist [129/187] Distance (1)
68- 70 F3.1 pc e_Dist [0.9/9] Uncertainty in Dist
72- 78 F7.4 mag Gmag [3.93/14.8] Gaia DR2 G-band magnitude
80- 85 F6.4 mag e_Gmag [0.0002/0.004] Measurement error for Gmag
87- 88 I2 --- Ref [1/16]? Reference(s) used (2)
--------------------------------------------------------------------------------
Note (1): Gaia DR2 distances assuming a 0.029mas zero point,
Lindegren+, 2018A&A...616A...2L 2018A&A...616A...2L.
Note (2): References as follows:
1 = Cowley+, 1969AJ.....74..375C 1969AJ.....74..375C
2 = Magazzu+, 1997, J/A+AS/124/449
3 = Cannon & Pickering, 1989, III/135
4 = Beavers & Cook, 1980ApJS...44..489B 1980ApJS...44..489B
5 = Lesh, 1968, III/23
6 = Abt, 2008, J/ApJS/176/216
7 = White+, 2007, J/AJ/133/2524
8 = Wright+, 2003, III/231
9 = Cowley, 1968PASP...80..453C 1968PASP...80..453C
10 = Grenier+, 1999, J/A+AS/137/451
11 = Nesterov+, 1995, III/182
12 = Bidelman+, 1988PASP..100..828B 1988PASP..100..828B
13 = Cowley, 1972AJ.....77..750C 1972AJ.....77..750C
14 = Molnar, 1972ApJ...175..453M 1972ApJ...175..453M
15 = Jaschek & Jaschek, 1980A&AS...42..115J 1980A&AS...42..115J
16 = van Leeuwen, 2007, I/311
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- MUTA [1/30] µTau Association identification number
4- 4 A1 --- Comp Binary component
6- 20 A15 --- Name Main target name
22- 27 F6.3 mas/yr pmRA [13.51/32.84] Proper motion in right ascension,
including the cosDE jacobian term (1)
29- 33 F5.3 mas/yr e_pmRA [0.07/0.8] Measurement error for pmRA
35- 41 F7.3 mas/yr pmDE [-26.69/-13.65] Proper motion in declination (1)
43- 47 F5.3 mas/yr e_pmDE [0.05/0.7] Measurement error for pmDE (1)
49- 52 F4.2 mas plx [5.3/7.7] Parallax (1)
54- 57 F4.2 mas e_plx [0.04/0.3] Measurement error for parallax (1)
59- 62 F4.1 km/s RVel [1/23] Radial velocity measurement from literature
64- 67 F4.1 km/s e_RVel [0.1/10] Measurement error for RVel
69- 69 I1 --- r_RVel [1/6] Reference for RVel (2)
--------------------------------------------------------------------------------
Note (1): All proper motion and parallax measurements are from Gaia DR2,
except for the parallax of µEri, which is from Hipparcos
(van Leeuwen 2007). See section 3 for more details.
Note (2): References as follows:
1 = Gontcharov, 2006, III/252
2 = Gaia Collaboration+, 2018, I/345
3 = Evans, 1967IAUS...30...57E 1967IAUS...30...57E
4 = White+, 2007, J/AJ/133/2524
5 = Wilson+, 1953, III/21
6 = Kharchenko+, 2007, J/AN/328/889
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- MUTA [31/376]? MUTA identification number (1)
5- 5 A1 --- Comp Binary component (2)
7- 34 A28 --- Name Main target name
36- 37 I2 h RAh [2/4] Hour of Right Ascension (ICRS, 2015.5)
39- 40 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
42- 47 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
49- 49 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
50- 51 I2 deg DEd Degree of Declination (ICRS, 2015.5)
53- 54 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
56- 60 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
62- 67 F6.3 mas/yr pmRA [11.19/47.33] Gaia DR2 proper motion in right
ascension, including the cosDE jacobian term
69- 73 F5.3 mas/yr e_pmRA [0.03/4.4] Measurement error for pmRA
75- 81 F7.3 mas/yr pmDE [-40.59/-11.58] Gaia DR2 proper motion in
declination
83- 87 F5.3 mas/yr e_pmDE [0.02/3.1] Measurement error for pmDE
89- 94 F6.3 mas plx [4.53/10.43] Gaia DR2 parallax
96-100 F5.3 mas e_plx [0.02/3.3] Measurement error for plx
102-105 F4.1 km/s RVel [4/26.2]? Radial velocity measurement, Gaia DR2
107-109 F3.1 km/s e_RVel [0.2/9.0]? Measurement error for RVel
111-116 F6.3 mag Gmag [5.26/20.97] Gaia DR2 G-band magnitude
--------------------------------------------------------------------------------
Note (1): The MUTA identifiers listed in this table are defined in Section
4.4. Targets without a MUTA ID number (MUTA is null) were flagged as
problematic (i.e., low-likelihood candidates). See Section 4 for more
details.
Note (2): Some identifiers listed here contain only one component of a
binary system (either A or B) because the other component was recovered
in either comover searches of sections 4.1 and 4.4.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Sys [1/26] System group number
4- 6 I3 --- MUTA [5/375]? MUTA identification number
8- 8 A1 --- Comp Binary component
10- 37 A28 --- Name Main target name
39- 40 I2 h RAh [2/4] Hour of Right Ascension (ICRS, 2015.5)
42- 43 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
45- 50 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
52- 52 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
53- 54 I2 deg DEd Degree of Declination (ICRS, 2015.5)
56- 57 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
59- 63 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
65- 70 F6.3 mas/yr pmRA [10.89/35.75] Gaia DR2 proper motion in right
ascension, including the cosDE jacobian term
72- 76 F5.3 mas/yr e_pmRA [0.03/1.9] Measurement error for pmRA
78- 84 F7.3 mas/yr pmDE [-33.7/-9.83] Gaia DR2 proper motion in
declination
86- 90 F5.3 mas/yr e_pmDE [0.02/1.3] Measurement error for pmDE
92- 95 F4.2 mas plx [4.43/7.9] Gaia DR2 parallax
97-100 F4.2 mas e_plx [0.02/1.2] Measurement error for plx
102-108 F7.4 mag Gmag [5.29/20.2] Gaia DR2 G-band magnitude
110-115 F6.4 mag e_Gmag [0.0002/0.005]? Measurement error for Gmag
117-124 F8.4 arcsec Sep [0.9/164]? Separation from primary star
calculated from Gaia DR2 positions
126-131 F6.4 arcsec e_Sep [0.0001/0.0009]? Measurement error for Sep
133-140 F8.4 deg PA [7.39/353]? Position angle with respect to
primary star calculated from Gaia DR2 positions
142-147 F6.4 deg e_PA [0.0001/0.03]? Measurement error for PA
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- MUTA [10/382] MUTA identification number
5- 5 A1 --- Comp Binary component
7- 20 A14 --- Name Main target name
22- 40 I19 --- Comov Gaia DR2 identification number for comoving star
42- 45 I4 --- Group [39/1109] Comoving group ID number from
Oh+, 2017, J/AJ/153/257
47- 56 A10 --- OType Object type (1)
--------------------------------------------------------------------------------
Note (1): Types as follows:
Initial = members of MUTA from our initial list (Table 1; 15 occurrences)
Candidates = candidates of MUTA recovered in Section 4 (Table 3;
12 occurrences);
Incomplete = Targets missing from our list of MUTA initial members and new
candidates (6 occurrences).
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Sys [1/16] System group number
4- 6 I3 --- MUTA [3/386]? MUTA identification number
8- 8 A1 --- Comp Binary component
10- 37 A28 --- Name Main target name
39- 40 I2 h RAh [3/4] Hour of Right Ascension (ICRS, 2015.5)
42- 43 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
45- 50 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
52- 52 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
53- 54 I2 deg DEd Degree of Declination (ICRS, 2015.5)
56- 57 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
59- 63 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
65- 70 F6.3 mas/yr pmRA [-1.86/30.5] Gaia DR2 proper motion in right
ascension, including the cosDE jacobian term
72- 76 F5.3 mas/yr e_pmRA [0.04/2.2] Measurement error for pmRA
78- 84 F7.3 mas/yr pmDE [-31.2/-13.6] Gaia DR2 proper motion in
declination
86- 90 F5.3 mas/yr e_pmDE [0.02/1.4] Measurement error for pmDE
92- 96 F5.3 mas plx [4.74/8.29] Gaia DR2 parallax
98-102 F5.3 mas e_plx [0.02/1.3] Measurement error for plx
104-109 F6.3 mag Gmag [5.04/20.5] Gaia DR2 G-band magnitude
111-117 F7.4 arcsec Sep [1.11/43.2]? Separation from primary star
calculated from Gaia DR2 positions
119-124 F6.4 arcsec e_Sep [0.0001/0.0005]? Measurement error for Sep
126-133 F8.4 deg PA [18.4/355]? Position angle with respect to
primary star calculated from Gaia DR2 positions
135-140 F6.4 deg e_PA [0.0001/0.03]? Measurement error for PA
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table10.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- MUTA [24/376] MUTA identification number
5- 5 A1 --- Comp Binary component
7- 29 A23 --- Name Main target name
31- 45 A15 --- ROSAT ROSAT designation
47- 49 I3 10-13m EW [0/350] Li absorption line equivalent width (1)
51- 54 I4 K Teff [4028/5943] Effective temperature
56- 56 I1 --- r_Teff [1/3] Reference for Effective temperature (2)
--------------------------------------------------------------------------------
Note (1): All lithium equivalent width measurements are from
Magazzu+, 1997, J/A+AS/124/449. TYC665-150-1 was excluded from
Figure 22 because it is a low-likelihood candidate member of MUTA
(its separation from the MUTA model in UVW space is 8.1km/s).
See Section 6.5 for more details.
Note (2): References as follows:
1 = Bai+, 2019, J/AJ/158/93
2 = Xing, 2010, J/ApJ/723/1542
3 = Gaia Collaboration+, 2018, I/345
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table11.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Main target name
25- 26 I2 h RAh [0/23] Hour of Right Ascension (ICRS, 2015.5)
28- 29 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
31- 36 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
38- 38 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
39- 40 I2 deg DEd Degree of Declination (ICRS, 2015.5)
42- 43 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
45- 49 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
51- 54 F4.2 d Per1 [0.31/9.61] Period (1)
56- 59 F4.2 d Per2 [0.39/9.13]? Second rotation period candidate (1)
61- 64 A4 --- Assoc Young association (2)
66- 66 I1 --- Ref [1/2] References for periods (3)
--------------------------------------------------------------------------------
Note (1): Rotation periods are accurate to approximately 2%.
Note (2): The full names as follows:
CAR = Carina (16 occurrences)
COL = Columba (24 occurrences)
THA = Tucana-Horologium association (117 occurrences)
MUTA = µTau Association (44 occurrences)
Note (3): References as follows:
1 = TESS (Jenkins+, 2016SPIE.9913E..3EJ ; Ricker+, 2015JATIS...1a4003R 2015JATIS...1a4003R
2 = K2 (Vanderburg & Johnson, 2014PASP..126..948V 2014PASP..126..948V;
Howell+, 2014PASP..126..398H 2014PASP..126..398H; Borucki+, 2010Sci...327..977B 2010Sci...327..977B).
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Byte-by-byte Description of file: table12.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- MUTA [1/386]? MUTA identification number
5- 5 A1 --- Comp Binary component
7- 34 A28 --- Name Main target name
36- 54 I19 --- Gaia Gaia DR2 identification number
56- 71 A16 --- 2MASS 2MASS designation, JHHMMSSss+DDMMSSs
73- 91 A19 --- AllWISE AllWISE designation
93-108 A16 --- ROSAT ROSAT designation
110-120 A11 --- Tycho Tycho catalog designation
122-126 I5 --- Hipparcos [12799/23819]?=-1 Hipparcos catalog design.
128-151 A24 --- SIMBAD Principal SIMBAD identifier
153-163 A11 --- SpT Spectral type (1)
165-183 A19 --- r_SpT Reference (ADS bibcode) for SpT
185-186 A2 --- Memb-Type Membership type (2)
188-201 A14 --- Source Source from which the target was obtained (3)
203-207 F5.1 % Memb-Prob [0/100] BANYAN Σ probability for
membership in MUTA
209-212 F4.1 km/s UVW-sep [0.2/27] Smallest possible separation,
UVW space (4)
214-218 F5.1 km/s XYZ-sep [2.1/140.5] Smallest possible separation,
XYZ space (4)
220-221 I2 h RAh [2/5] of Right Ascension (ICRS, 2015.5)
223-224 I2 min RAm Minute of Right Ascension (ICRS, 2015.5)
226-231 F6.3 s RAs Second of Right Ascension (ICRS, 2015.5)
233-233 A1 --- DE- [±] Sign of the Declination (ICRS, 2015.5)
234-235 I2 deg DEd Degree of Declination (ICRS, 2015.5)
237-238 I2 arcmin DEm Arcminute of Declination (ICRS, 2015.5)
240-244 F5.2 arcsec DEs Arcsecond of Declination (ICRS, 2015.5)
246-251 F6.3 mas/yr pmRA [-1.86/47.4] Gaia DR2 proper motion in right
ascension, including the cosDE jacobian term
253-259 F7.3 mas/yr pmDE [-40.6/-9.83] Gaia DR2 proper motion in
declination
261-265 F5.3 mas/yr e_pmRA [0.03/4.4] Measurement error for pmRA
267-271 F5.3 mas/yr e_pmDE [0.02/3.1] Measurement error for pmDE
273-277 F5.2 mas plx [3.99/10.4] Gaia DR2 parallax
279-282 F4.2 mas e_plx [0.02/3] Measurement error for plx
284-287 F4.1 --- ruwe [0.8/11.3]? Re-normalized unit weight error
of Gaia DR2 astrometric solution Section 4.4
289-292 F4.1 km/s RVel [1/42.6]? Radial velocity measurement from
the literature
294-297 F4.1 km/s e_RVel [0.1/10]? Measurement error for RVel
299-317 A19 --- r_RVel Reference (ADS bibcode) for RVel
319-320 I2 km/s Pred-RV [2/26]? Predicted radial velocity (5)
322-322 I1 km/s e_Pred-RV [3/4]? 1σ error on Pred-RV
324-330 F7.4 mag Gmag [3.93/21] Gaia DR2 G-band magnitude
332-337 F6.4 mag e_Gmag [0.0002/0.02] Measurement error for Gmag
339-345 F7.4 mag RPmag [4.1/20.1]? Gaia DR2 GRP-band magnitude
347-352 F6.4 mag e_RPmag [0.0005/0.1]?=0.00 Error for RPmag
354-360 F7.4 mag BPmag [3.92/22]? Gaia DR2 GBP-band magnitude
362-367 F6.4 mag e_BPmag [0.0006/0.7]?=0.00 Error for BPmag
369-374 F6.3 mag Jmag [4.1/17.4]? 2MASS J-band magnitude
376-380 F5.3 mag e_Jmag [0.001/0.3]?=0.00 Error for Jmag
382-387 F6.3 mag Hmag [3.4/16.6]? 2MASS H-band magnitude
389-393 F5.3 mag e_Hmag [0.009/0.2]?=0.00 Error for Hmag
395-400 F6.3 mag Ksmag [3.1/16]? 2MASS Ks-band magnitude
402-406 F5.3 mag e_Ksmag [0.007/0.3]?=0.00 Error for Ksmag
408-412 F5.2 mag W1mag [2.35/17.6]? AllWISE W1-band magnitude
414-417 F4.2 mag e_W1mag [0.02/0.3]?=0.00 Error for W1mag
419-423 F5.2 mag W2mag [2.9/17.2]? AllWISE W2-band magnitude
425-428 F4.2 mag e_W2mag [0.02/0.5]?=0.00 Error for W2mag
430-434 F5.2 mag W3mag [3.11/13]? AllWISE W3-band magnitude
436-439 F4.2 mag e_W3mag [0.01/0.5]?=0.00 Error for W3mag
441-444 F4.2 mag E(B-V) [0.0/0.22] E(B-V) reddening (6)
446-449 F4.2 mag e_E(B-V) [0.01/0.1] Measurement error for E(B-V)
451-456 F6.3 mag NUVmag [11.2/22.4]? GALEX NUV-band magnitude
458-462 F5.3 mag e_NUVmag [0.002/0.5]? Measurement error for NUVmag
464-469 F6.3 mag FUVmag [12.5/21.6]? GALEX FUV-band magnitude
471-475 F5.3 mag e_FUVmag [0.005/0.4]? Measurement error for FUVmag
477-481 F5.2 --- HR1 [-1.0/1.0]? ROSAT hardness ratio HR1
483-487 F5.2 --- HR2 [-0.36/1.0]? ROSAT hardness ratio HR2
489-492 F4.2 ct/s Xray [0.01/0.21]? ROSAT X-ray counts
494-497 F4.2 ct/s e_Xray [0.01/0.03]? Measurement error for Xray
499-502 F4.1 [Lsun] logLX [29.3/30.5]? Absolute X-ray luminosity
log(LX/Lsun) (7)
504-506 F3.1 [Lsun] e_logLX [0.2/0.8]? Measurement error for logLX
508-510 I3 10-13m EW [0/350]? Li absorption line equivalent width
512-530 A19 --- r_EW Reference (ADS bibcode) for EW
532-535 I4 K Teff [4028/5943]? Effective temperature
537-555 A19 --- r_Teff Reference (ADS bibcode) for Teff
557-557 I1 --- Primary [0/1] Is primary or single? (8)
559-560 A2 --- Multi Identifier letter for multiple system
components
562-569 F8.4 arcsec Sep [0.9/164]? Separation from primary star
calculated from Gaia DR2 positions
571-576 F6.4 arcsec e_Sep [0.0001/0.0009]? Error for Sep
578-585 F8.4 deg PA [7.39/355]? Position angle with respect to
primary star calculated from Gaia DR2 pos.
587-592 F6.4 deg e_PA [0.0001/0.03]? Measurement error for PA
594-672 A79 --- Comov ? Gaia DR2 identification number for comoving
star (primary or companion or list)
674-677 I4 --- Group [39/1109]? Comoving group identification
number from Oh+, 2017, J/AJ/153/257
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Note (1): Literature spectral type. Spectral type estimates based on Gaia DR2
colors are given between parentheses. (WD) indicates likely white dwarfs.
Note (2): Membership as follows:
IM = Member from our initial list (Table 1; 36 occurrences)
CM = Candidate member (Table 3; 357 occurrences)
LM = Low-priority candidate member (Table 3; no MUTA id; 155 occurrences)
R = Rejected candidate member (18 occurrences)
Note (3): Sources as follows:
INIT = Initial list described in Section 2;
GAIA = Originates from our Gaia DR2-based search for additional candidate
members described in Section 4;
COM = Originates from our comover search described in Section 4.1;
VIS = Originates from our visual identification of comover candidates
described in Section 4.5;
OH2017 = Originates from a Oh+, 2017, J/AJ/153/257 group with a
partial match to our MUTA members and candidates.
Note (4): Smallest possible separation from the center of the BANYAN Σ
model in UVW or XYZ space.
Note (5): Predicted radial velocity that maximizes MUTA membership probability
obtained from BANYAN Σ, only listed for targets without a radial
velocity measurement.
Note (6): E(B-V) reddening based on the STILISM reddening map combined with
Gaia DR2 distance and sky position. See Section 5 for more details.
Note (7): Absolute X-ray luminosity log LX/Lsun calculated from ROSAT X-ray
data and Gaia DR2 trigonometric distance.
Note (8): Code as follows:
1 = Single stars or primary (brightest) star in a multiple system;
0 = Companion star in a multiple system.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 02-Feb-2022