J/A+A/630/A137 Structure and kinematics of the Taurus region (Galli+, 2019)
Structure and kinematics of the Taurus star-forming region from Gaia-DR2 and
VLBI astrometry.
Galli P.A.B., Loinard L., Bouy H., Sarro L.M., Ortiz-Leon G.N.,
Dzib S.A., Olivares J., Heyer M., Hernandez J., Roman-Zuniga C.,
Kounkel M., Covey K.
<Astron. Astrophys. 630, A137 (2019)>
=2019A&A...630A.137G 2019A&A...630A.137G (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Clusters, open ; Stars, distances
Keywords: open clusters and associations: individual: Taurus -
stars: formation - stars: distances - methods: statistical
Abstract:
We take advantage of the second data release of the Gaia space mission
and the state-of-the-art astrometry delivered from very long baseline
interferometry observations to revisit the structure and kinematics of
the nearby Taurus star-forming region. We apply a hierarchical
clustering algorithm for partitioning the stars in our sample into
groups (i.e., clusters) that are associated with the various molecular
clouds of the complex, and derive the distance and spatial velocity of
individual stars and their corresponding molecular clouds. We show
that the molecular clouds are located at different distances and
confirm the existence of important depth effects in this region
reported in previous studies. For example, we find that the L∼1495
molecular cloud is located at d=129.9+0.4-0.3pc, while the
filamentary structure connected to it (in the plane of the sky) is at
d=160.0+1.2-1.2pc. We report B215 and L1558 as the closest
(d=128.5+1.6-1.6pc) and most remote (d=198.1+2.5-2.5pc)
substructures of the complex, respectively. The median inter-cloud
distance is 25pc and the relative motion of the subgroups is on the
order of a few km/s. We find no clear evidence for expansion (or
contraction) of the Taurus complex, but signs of the potential effects
of a global rotation. Finally, we compare the radial velocity of the
stars with the velocity of the underlying 13CO molecular gas and
report a mean difference of 0.04±0.12km/s (with r.m.s. of 0.63km/s)
confirming that the stars and the gas are tightly coupled.
Description:
Kinematic properties of 519 stars in the Taurus star-forming region.
For each star we provide identifiers, positions, proper motion,
parallax, radial velocity, membership status, distance,
three-dimensional position and spatial velocity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 230 519 Proper motions, parallaxes, radial velocities
tablea3.dat 280 174 Distance and spatial velocity
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- 2MASS Source identifier from 2MASS catalogue
27- 54 A28 --- GaiaDR2 Source identifier from Gaia-DR2 catalogue
57- 80 A24 --- Name Other source identifier
85- 86 I2 h RAh Right ascension (J2000.0)
88- 89 I2 min RAm Right ascension (J2000.0)
91- 95 F5.2 s RAs Right ascension (J2000.0)
98 A1 --- DE- Declination sign (J2000.0)
99-100 I2 deg DEd Declination (J2000.0)
102-103 I2 arcmin DEm Declination (J2000.0)
105-108 F4.1 arcsec DEs Declination (J2000.0)
110-116 F7.3 mas/yr pmRA ? Proper motion in right ascension
120-124 F5.3 mas/yr e_pmRA ? Error in proper motion in right ascension
128-134 F7.3 mas/yr pmDE ? Proper motion in declination
138-142 F5.3 mas/yr e_pmDE ? Error in proper motion in declination
145-150 F6.3 mas plx ? Parallax
155-159 F5.3 mas e_plx ? Error in parallax
163-169 A7 --- r-astro Source of astrometric data (GaiaDR2 or VLBI)
172-178 F7.3 km/s rv ? Radial velocity
181-186 F6.3 km/s e_rv ? Error in radial velocity
190-191 A2 --- r_rv Source of radial velocity (1)
198-199 A2 --- Cluster HMAC cluster
206 I1 --- Member [0/1] Membership status
214 I1 --- J17 [0/1] Membership status by Joncour et al.
2017, Cat. J/A+A/599/A14
222 I1 --- L18-t1 [0/1] Membership status by Luhman
2018, Cat. J/AJ/156/271 (table 1)
230 I1 --- L18-t6 [0/1] Membership status by Luhman
2018, Cat. J/AJ/156/271 (table 6)
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Note (1): References for radial velocities:
1 = Wilson, 1953GCRV..C......0W 1953GCRV..C......0W, Cat. III/21
2 = Hartmann et al., 1986ApJ...309..275H 1986ApJ...309..275H
3 = Hartmann et al., 1987AJ.....93..907H 1987AJ.....93..907H
4 = Herbig & Bell, 1988cels.book.....H 1988cels.book.....H, Cat. V/73
5 = Reipurth et al., 1990A&A...235..197R 1990A&A...235..197R
6 = Duflot et al., 1995A&AS..114..269D 1995A&AS..114..269D, Cat. III/190
7 = Mathieu et al., 1997AJ....113.1841M 1997AJ....113.1841M
8 = Wichmann et al., 2000A&A...359..181W 2000A&A...359..181W
9 = White & Basri, 2003ApJ...582.1109W 2003ApJ...582.1109W
10 = Muzerolle et al., 2003ApJ...592..266M 2003ApJ...592..266M
11 = Gontcharov, 2006AstL...32..759G 2006AstL...32..759G, Cat. III/252
12 = Torres et al., 2006A&A...460..695T 2006A&A...460..695T, Cat. J/A+A/460/695
13 = Kharchenko et al., 2007AN....328..889K 2007AN....328..889K, Cat. J/AN/328/889
14 = Scelsi et al., 2008A&A...490..601S 2008A&A...490..601S
15 = Nguyen et al., 2012ApJ...745..119N 2012ApJ...745..119N, Cat. J/ApJ/745/119
16 = Kraus et al., 2017ApJ...838..150K 2017ApJ...838..150K, Cat. J/ApJ/838/150
17 = Kounkel et al., 2019AJ....157..196K 2019AJ....157..196K, Cat. J/AJ/157/196
18 = Gaia-DR2, 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- 2MASS Source identifier from 2MASS catalogue
25- 52 A28 --- GaiaDR2 Source identifier from Gaia-DR2 catalogue
54- 67 A14 --- Name Other source identifier
69- 73 F5.1 pc dist-inv Distance from the inverse of the parallax
75 A1 --- --- [-]
76- 79 F4.1 pc e_dist-inv Lower uncertainty for the distance
81- 84 F4.1 pc E_dist-inv Upper uncertainty for the distance
86- 90 F5.1 pc dist Distance from Bayesian inference
92 A1 --- --- [-]
93- 96 F4.1 pc e_dist Lower uncertainty for the distance
98-102 F5.1 pc E_dist Upper uncertainty for the distance
105-110 F6.1 pc Xgal X-coordinate
112 A1 --- --- [-]
113-117 F5.1 pc e_Xgal Lower uncertainty of X
119-122 F4.1 pc E_Xgal Upper uncertainty of X
124-128 F5.1 pc Ygal Y-coordinate
131 A1 --- --- [-]
132-134 F3.1 pc e_Ygal Lower uncertainty of Y
136-139 F4.1 pc E_Ygal Upper uncertainty of Y
143-147 F5.1 pc Zgal Z-coordinate
149 A1 --- --- [-]
150-154 F5.1 pc e_Zgal Lower uncertainty of Z
156-158 F3.1 pc E_Zgal Upper uncertainty of Z
162-166 F5.1 km/s Ugal ? U-component of the velocity
168 A1 --- --- [-]
169-171 F3.1 km/s e_Ugal ? Lower uncertainty of U
174-176 F3.1 km/s E_Ugal ? Upper uncertainty of U
180-184 F5.1 km/s Vgal ? V-component of the velocity
186 A1 --- --- [-]
187-189 F3.1 km/s e_Vgal ? Lower uncertainty of V
192-194 F3.1 km/s E_Vgal ? Upper uncertainty of V
198-202 F5.1 km/s Wgal ? W-component of the velocity
204 A1 --- --- [-]
205-207 F3.1 km/s e_Wgal ? Lower uncertainty of W
210-212 F3.1 km/s E_Wgal ? Upper uncertainty of W
216-220 F5.1 km/s uLSR ? u-component of the LSR velocity
222 A1 --- --- [-]
223-225 F3.1 km/s e_uLSR ? Lower uncertainty of u
228-230 F3.1 km/s E_uLSR ? Upper uncertainty of u
234-237 F4.1 km/s vLSR ? v-component of the LSR velocity
240 A1 --- --- [-]
241-243 F3.1 km/s e_vLSR ? Lower uncertainty of v
246-248 F3.1 km/s E_vLSR ? Upper uncertainty of v
252-255 F4.1 km/s wLSR ? w-component of the LSR velocity
258 A1 --- --- [-]
259-261 F3.1 km/s e_wLSR ? Lower uncertainty of w
264-266 F3.1 km/s E_wLSR ? Upper uncertainty of w
269-274 F6.2 km/s rvLSR ? Radial velocity converted to LSR
277-280 F4.2 km/s e_rvLSR ? Uncertainty of rvLSR
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Acknowledgements:
Phillip Galli, phillip.galli(at)u-bordeaux.fr
(End) Phillip Galli [LAB, France], Patricia Vannier [CDS] 16-Sep-2019