J/ApJS/254/20 Stellar groups in Taurus field from Gaia DR2 & LAMOST (Liu+, 2021)
The old moving groups in the field of Taurus.
Liu J., Fang M., Tian H., Liu C., Yang C., Xue X.
<Astrophys. J. Suppl. Ser., 254, 20-20 (2021)>
=2021ApJS..254...20L 2021ApJS..254...20L (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar; Stars, distances; Spectral types;
YSOs; Star Forming Region
Keywords: Pre-main sequence stars; Young stellar objects; Stellar accretion
Accretion; Stellar accretion disks; Star clusters
Stellar associations; Star formation; Star-forming regions
Abstract:
In this work, we present a systematic search for stellar groups in the
Taurus field by applying the DBSCAN algorithm to the data from
Gaia DR2. We find 22 groups, consisting of 8 young groups (Groups 1-8)
at ages of 2-4Myr and distances of ∼130-170pc, and 14 old groups
(Groups 9-22) at ages of 8-49Myr and distances of ∼110-210pc. We
characterize the disk properties of group members and find 19 new
disk-bearing stars, 8 of which are in the young groups with 11 others
belonging to the comparatively old groups at the ages of 8-11Myr. We
characterize the accretion properties of the group members with
Hα emission lines in their Large Sky Area Multi-Object Fibre
Spectroscopic Telescope spectra, and discover one source in Group 10
at an age of 10Myr which still shows accretion activity. We
investigate the kinematic relations among the old groups, find that
Group 9 is kinematically related to the known Taurus members, and
exclude any kinematic relations between Groups 10-22 and the known
Taurus members.
Description:
In order to fully explore the Taurus region, we use a large searching
area: 55°≤RA≤90° and 10°≤DEC≤35°.
The spectroscopic data used in this work are taken from the Large Sky
Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) DR5. LAMOST
is a 4m Schmidt telescope of the National Astronomical Observatories
of China, located at Xinglong Observing Station, China. In this work,
we use the LAMOST DR5 data set.
In order to construct the spectral energy distribution of each source
and estimate its extinction, we used optical photometry in the g, r,
i, z, and y bands from Pan-STARRS (Cat. II/349) and G, GBP, and
GRP bands from Gaia DR2 (Cat. I/345), near-infrared photometry in
the J, H, and KS bands from the Two-Micron All Sky Survey (2MASS;
see Cat. II/246), and near- and mid-infrared photometry in the
W1 (3.4um), W2 (4.6um), W3 (12um), and W4 (22um) bands from the WISE
(see Cat. II/311) all-sky survey.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 89 630 A list of members in each group
table2.dat 80 22 A list of the groups identified in this work
--------------------------------------------------------------------------------
See also:
III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
V/153 : LAMOST DR4 catalogs (Luo+, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)
J/A+A/468/353 : XMM-Newton Extended Survey of Taurus (Guedel+, 2007)
J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)
J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)
J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)
J/AJ/139/1338 : UV-selected stars in Tau and Upper Sco (Findeisen+, 2010)
J/ApJS/196/4 : New young star candidates in Taurus-Auriga (Rebull+, 2011)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)
J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)
J/ApJS/216/26 : GALEX search for TT in Taurus-Auriga (Gomez de Castro+, 2015)
J/AJ/153/188 : Spectroscopy of the foreground pop. in Orion A (Fang+, 2017)
J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)
J/A+A/601/A19 : Gaia DR1 open cluster members (Gaia Collaboration+, 2017)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/AJ/154/134 : Planetary-mass brown dwarfs in the Taurus SFR (Esplin+, 2017)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/ApJ/858/41 : PS1 proper-motion survey for BDs. I. Taurus (Zhang+, 2018)
J/ApJ/860/43 : BANYAN. XII. New members from Gaia-Tycho data (Gagne+, 2018)
J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)
J/A+A/623/A72 : Binarity of Hipparcos stars from Gaia (Kervella+, 2019)
J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)
J/AJ/158/54 : New Taurus members (Esplin+, 2019)
J/A+A/638/A85 : 3D view of Taurus with Gaia & Herschel (Roccatagliata+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Group [1/22] Group number as in Table 2
4- 6 I3 --- Seq [1/630] Sequential running number
8- 36 A29 --- Name Object name
38- 45 F8.5 deg RAdeg [55/90] Right Ascension (ICRS) at Epoch=J2000 (1)
47- 54 F8.5 deg DEdeg [12/32.5] Declination (ICRS) at Epoch=J2000 (1)
56- 60 F5.1 pc Dist [101.4/218.2] Gaia DR2 distance
62- 65 A4 --- SpT Spectral type
67- 68 I2 --- r_SpT [1/14]? Spectral type reference (2)
70 A1 --- Mm Status of membership (3)
72- 73 I2 --- Disk [5/18]? References for disk signatures (2)
74- 74 A1 --- f_Disk [f] Flags on unconfirmed stars (4)
77- 82 F6.2 0.1nm EWHa [1/271.3]? LAMOST Hα equivalent widths,
in Angstroms units
84- 84 A1 --- TTS [CW] Classical or Weak-lined T-Tauri
categorization (5)
86- 89 F4.2 mag AJ [0/1.7] J-band extinction used in this work
--------------------------------------------------------------------------------
Note (1): As calculated by CDS/Vizier in Cat. I/345 (Gaia DR2).
Note (2): References as follows:
1 = Muller (1950JO.....33..105M 1950JO.....33..105M);
2 = Heintz (1975ApJS...29..315H 1975ApJS...29..315H);
3 = Slesnick et al. (2006, J/AJ/132/2665);
4 = Dunkin & Crawford (1998MNRAS.298..275D 1998MNRAS.298..275D);
5 = Esplin & Luhman (2019, J/AJ/158/54);
6 = from the LAMOST catalog (V/164);
7 = This work;
8 = Cannon & Pickering (III/135);
9 = Nesterov et al. (III/182);
10 = Biazzo et al. (2012A&A...542A.115B 2012A&A...542A.115B);
11 = Herczeg & Hillenbrand (2014, J/ApJ/786/97);
12 = Gagne et al. (2018, J/ApJ/860/43);
13 = Kervella et al. (2019, J/A+A/623/A72)
14 = Maheswar et al. (2002A&A...387.1003M 2002A&A...387.1003M);
15 = Jensen & Akeson (2003ApJ...584..875J 2003ApJ...584..875J);
16 = Eisner et al. (2004ApJ...613.1049E 2004ApJ...613.1049E);
17 = Rebull et al. (2011, J/ApJS/196/4);
18 = Menu et al. (2015A&A...581A.107M 2015A&A...581A.107M)
Note (3): New members ("Y"; 17 stars) or non-members ("N"; 30 stars) of the
young groups (2-4Myr) identified in this work.
Note (4):
f = The 20 disk bearing stars of Esplin & Luhman (2019, J/AJ/158/54)
that not confirmed in this work.
Note (5): Categorization as follows:
C = Classical T-Tauri stars (CTTSs; 38 occurrences)
W = Weak-line T-Tauri stars (WTTSs; 179 occurrences)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Group [1/22] Group number
4- 5 I2 --- Nm [7/57] Number of members
7- 8 I2 --- Nspt [0/55] Number of members with literature
spectral types (1)
10- 37 A28 --- OName Other name for Group (2)
39- 43 F5.2 deg RAdeg Mean Group Right Ascension (J2000)
45- 49 F5.2 deg DEdeg Mean Group Declination (J2000)
51- 55 F5.2 mas/yr pmRA [-2.4/24] Mean Group proper motion,
Right Ascension
57- 59 I3 mas/yr pmDE [-37/-14] Mean Group proper motion,
Declination
61- 63 I3 pc Dist [109/211] Mean Group distance
65- 66 I2 pc E_Dist [3/15] Upper uncertainty on Dist
68- 69 I2 pc e_Dist [2/22] Lower uncertainty on Dist
71- 72 I2 Myr Age1 [2/49] Age, individual extinction(s) (3)
74- 75 I2 Myr Age2 [2/59] Age, group extinction (4)
77- 80 F4.2 mag AJ [0.02/0.6] Mean Group J-band extinction
--------------------------------------------------------------------------------
Note (1): Numbers of the stars with known spectral types in the literature --
Slesnick et al. (2006, J/AJ/132/2665); Kraus et al. (2017, J/ApJ/838/150);
Esplin & Luhman (2019, J/AJ/158/54).
Note (2): Other names include --
"A" - "F" denote the Groups of Roccatagliata+ (2020, J/A+A/638/A85);
Oh17 and Oh17-X(c/t) indicate Oh+ (2017, J/AJ/153/257) and the star
pair of it. "X" denotes the name of the star pair, "t" denotes the
total members of the star pair, while "c" denotes how many members
contains in the catalogue of this work.
Note (3): The ages of the groups that derived by fitting the dereddened
color-magnitude diagrams with the isochrones of PARSEC models. The
extinction of each individual star is considered;
Note (4): The ages derived by fitting the observed color-magnitude diagrams
with the isochrones of PARSEC models, but assuming that all members
of a group share the same extinction and treating the extinction as
a free parameter.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Aug-2021