J/AJ/152/24 Trigonometric parallaxes of 134 low-mass stars (Weinberger+, 2016)
Trigonometric parallaxes and proper motions of 134 southern late M, L, and T
dwarfs from the Carnegie Astrometric Planet Search program.
Weinberger A.J., Boss A.P., Keiser S.A., Anglada-Escude G., Thompson I.B.,
Burley G.
<Astron. J., 152, 24-24 (2016)>
=2016AJ....152...24W 2016AJ....152...24W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Stars, nearby ; Proper motions ; Spectral types ;
Parallaxes, trigonometric
Keywords: astrometry - brown dwarfs - stars: low-mass
Abstract:
We report trigonometric parallaxes for 134 low-mass stars and brown
dwarfs, of which 38 have no previously published measurement and 79
more have improved uncertainties. Our survey focused on nearby
targets, so 119 are closer than 30pc. Of the 38 stars with new
parallaxes, 14 are within 20pc and seven are likely brown dwarfs
(spectral types later than L0). These parallaxes are useful for
studies of kinematics, multiplicity, and spectrophotometric
calibration. Two objects with new parallaxes are confirmed as young
stars with membership in nearby young moving groups: LP 870-65 in AB
Doradus and G161-71 in Argus. We also report the first parallax for
the planet-hosting star GJ3470; this allows us to refine the density
of its Neptune-mass planet. T-dwarf 2MASSJ12590470-4336243, previously
thought to lie within 4pc, is found to be at 7.8pc, and the M-type
star 2MASSJ01392170-3936088 joins the ranks of nearby stars as it is
found to be within 10pc. Five stars that are overluminous and/or too
red for their spectral types are identified and deserve further study
as possible young stars.
Description:
CAPSCam operates on the 2.5-m du Pont telescope at the Las Campanas
Observatory in Chile. CAPSCam has no internal moving parts and employs
an astrometric quality filter as its window, which is approximately z
band (865nm with a bandpass of 100nm). The field of view is 6.7arcmin
on a side, with 2048*2048 pixels, each subtending 0.196''.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 134 *Observational information for CAPSCam targets
with solved parallaxes
table2.dat 124 134 Astrometric results
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Note on table1.dat: CAPSCam operates on the 2.5-m du Pont telescope at the Las
Campanas Observatory in Chile.
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)
J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014)
J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)
J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)
J/ApJ/752/56 : BDKP. III. Parallaxes for 70 ultracool dwarfs (Faherty+, 2012)
J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)
J/AJ/137/1 : Proper motions of late-type dwarfs (Faherty+, 2009)
J/AJ/136/452 : Astrometric studies of GAT stars (Gatewood, 2008)
J/AJ/133/2825 : Star beyond the NLTT catalog (Reid+, 2007)
J/A+A/446/515 : Distances of nearby ultracool dwarfs (Phan-Bao+, 2006)
J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006)
J/A+A/442/211 : Spectroscopic distances of 322 NLTT stars (Scholz+, 2005)
J/A+A/441/653 : 32 DENIS nearby red dwarfs (Crifo+, 2005)
J/A+A/440/1061 : Southern red high proper motion objects (Lodieu+, 2005)
J/A+A/435/363 : Southern Infrared Proper Motion Survey (Deacon+, 2005)
J/PASP/117/676 : LHS faint proper-motion stars (Reid+, 2005)
J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003)
J/AJ/123/2828 : Spectroscopy of northern NLTT stars (Cruz+, 2002)
J/AJ/108/2338 : Photographic astrometry. VIII. (Heintz 1994)
J/AJ/105/1571 : USNO Photographic Parallaxes IX (Harrington+ 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Target identifier
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 44 A6 --- SpT Spectral type, visual wavelength where available
46- 47 A2 --- r_SpT Reference for SpT (1)
49- 51 I3 s tFF [20/240] Full Field integration time
(tint,FF) (2)
53- 56 F4.1 s tGW [0.2/30]? Guide Window integration time
(tint,GW) (2)
58- 59 I2 --- Nr [6/57] Number of reference stars
61- 62 I2 --- Ne [4/28] Number of epochs
64- 72 F9.1 d JD0 Julian Date of the observation start
74- 82 F9.1 d JD1 Julian Date of the observation end
84- 86 F3.1 yr dT [1.1/8] Time between start and end of
observation (Δt)
88- 93 F6.3 mag Jmag [6.6/15.4] 2MASS J band magnitude (mJ)
95- 99 F5.3 mag e_Jmag [0.017/0.051] Uncertainty in Jmag (σmJ)
101-105 F5.2 mag [3.4] [5.7/15]? The 3.4µm band (W1) magnitude from
AllWISE catalog (Cutri et al. 2013, Cat. II/328)
107-110 F4.2 mag e_[3.4] [0.02/0.14]? Uncertainty in [3.4] (σmW1)
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Note (1): Reference codes for the spectral types are defined as follows:
1 = Reid et al. 1995 (Cat. III/198);
2 = Faherty et al. 2009 (Cat. J/AJ/137/1);
3 = Kendall et al. (2007MNRAS.374..445K 2007MNRAS.374..445K);
4 = Phan-Bao & Bessell 2006 (Cat. J/A+A/446/515);
5 = Hawley et al. 1996 (Cat. III/198);
6 = Cruz & Reid 2002 (Cat. J/AJ/123/2828);
7 = Reid et al. 2003 (Cat. J/AJ/126/3007);
8 = Riaz et al. 2006 (Cat. J/AJ/132/866);
9 = Bonfils et al. 2013 (Cat. J/A+A/556/A110);
10 = Bowler et al. (2010ApJ...710...45B 2010ApJ...710...45B);
11 = Crifo et al. 2005 (Cat. J/A+A/441/653);
12 = Reid & Gizis 2005 (Cat. J/PASP/117/676);
13 = Marshall 2008 (2008AJ....135.1000M 2008AJ....135.1000M);
14 = Scholz et al. 2005 (Cat. J/A+A/442/211);
15 = Lodieu et al. 2005 (Cat. J/A+A/440/1061);
16 = Reid et al. 2007 (Cat. J/AJ/133/2825).
Note (2): The field of view is 6.7' on a side, with 2048*2048 pixels, each
subtending 0.196''. A subarray, also known as the "guide window," is
arbitrarily sizable and locatable and may be read out independently from
the rest of the field. A bright target star is placed in the guide window,
which is then read out fast enough so the star does not saturate while the
rest of the pixels integrate on the reference stars; a mechanical shutter
in front of the entrance window ensures that the exposure time on the
bright star remains as commensurate as possible with that on the full
field. Thus, the camera can achieve high dynamic range without excessive
overhead.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Target identifier
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 44 F6.2 mas plx [9.1/412.5] Relative trigonometric parallax
(πrel)
46- 50 F5.2 mas e_plx [0.2/11.4] Uncertainty in plx (σπrel)
52- 56 F5.2 mas ZPt [-8.4/6.8] Zero point parallax correction
58- 61 F4.2 mas e_ZPt [0/2.5] Uncertainty in ZPt (σZPt)
63- 68 F6.2 mas PLX [12.3/418.9]? Literature trigonometric parallax
(πLit.) (3)
70- 74 F5.2 mas e_PLX [0.28/41]? Uncertainty in PLX (σπLit)
76- 82 A7 --- r_PLX Reference(s) for PLX (4)
84- 91 F8.2 mas/yr pmRA [-3808.1/3955.6] Relative proper motion along
Right Ascension (µRA*cosδ)
93- 96 F4.2 mas/yr e_pmRA [0.1/6] Relative uncertainty in pmRA
(σµRA)
98-105 F8.2 mas/yr pmDE [-5045/1595] Relative proper motion along
Declination (µδ)
107-111 F5.2 mas/yr e_pmDE [0.11/12.85] Relative uncertainty in pmDE
(σµδ)
113-118 F6.2 mas Plx [8.6/413.2] Final absolute trigonometric parallax
(πabs)
120-124 F5.2 mas e_Plx [0.31/11.4] Uncertainty in Plx (σπabs)
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Note (3): Literature parallaxes are weighted averages when more than one value
exists.
Note (4): Reference codes for the literature parallax are defined as follows:
1 = van Altena et al. (1995gcts.book.....V 1995gcts.book.....V);
2 = Tinney et al. (1995AJ....110.3014T 1995AJ....110.3014T);
3 = Costa et al. (2005AJ....130..337C 2005AJ....130..337C);
4 = Harrington & Dahn (1980AJ.....85..454H 1980AJ.....85..454H);
5 = Dahn et al. (1988AJ.....95..237D 1988AJ.....95..237D);
6 = Dahn et al. (2002AJ....124.1170D 2002AJ....124.1170D);
7 = Dahn et al. (1982AJ.....87..419D 1982AJ.....87..419D);
8 = Henry et al. (2006AJ....132.2360H 2006AJ....132.2360H);
9 = Costa et al. (2006AJ....132.1234C 2006AJ....132.1234C);
10 = Riedel et al. (2010AJ....140..897R 2010AJ....140..897R);
11 = Faherty et al. 2012 (Cat. J/ApJ/752/56);
12 = Tinney (1996MNRAS.281..644T 1996MNRAS.281..644T);
13 = Dieterich et al. 2014 (Cat. J/AJ/147/94);
14 = Vrba et al. (2004AJ....127.2948V 2004AJ....127.2948V);
15 = Riedel et al. 2014 (Cat. J/AJ/147/85);
16 = Marocco et al. (2013AJ....146..161M 2013AJ....146..161M);
17 = Gatewood et al. 2008 (Cat. J/AJ/136/452);
18 = Riedel et al. (2011AJ....142..104R 2011AJ....142..104R);
19 = Andrei et al. (2011AJ....141...54A 2011AJ....141...54A);
20 = Heintz 1994 (Cat. J/AJ/108/2338);
21 = Ianna & Fredrick (1995ApJ...441L..47I 1995ApJ...441L..47I);
22 = Anglada-Escude et al. (2012ApJ...746...37A 2012ApJ...746...37A);
23 = Smart et al. (2010A&A...514A..84S 2010A&A...514A..84S);
24 = Jao et al. (2005AJ....129.1954J 2005AJ....129.1954J);
25 = Jao et al. (2011AJ....141..117J 2011AJ....141..117J);
26 = Deacon & Hambly (2001A&A...380..148D 2001A&A...380..148D);
27 = van Leeuwen 2007 (Cat. I/311);
28 = Harrington et al. 1993 (Cat. J/AJ/105/1571);
29 = Deacon et al. 2005 (Cat. J/A+A/435/363);
30 = Dupuy & Liu 2012 (Cat. J/ApJS/201/19);
31 = Pravdo & Shaklan (2009ApJ...700..623P 2009ApJ...700..623P);
32 = Mamajek et al. (2013AJ....146..154M 2013AJ....146..154M).
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 14-Sep-2016