J/A+A/626/A17 Young population in Vela-Puppis region (Cantat-Gaudin+, 2019)
Expanding associations in the Vela-Puppis region.
3D structure and kinematics of the young population.
Cantat-Gaudin T., Jordi C., Wright N.J., Armstrong J.J., Vallenari A.,
Balaguer-Nunez L., Ramos P., Bossini D., Padoan P., Pelkonen V.M.,
Mapelli M., Jeries R.D.
<Astron. Astrophys. 626, A17 (2019)>
=2019A&A...626A..17C 2019A&A...626A..17C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, early-type
Keywords: open clusters and associations: individual: Vela OB2 -
open clusters and associations: individual: Trumpler 10 -
open clusters and associations: individual: NGC 2547 -
open clusters and associations: individual: NGC 2451B -
stars: pre-main sequence
Abstract:
The Vela-Puppis region is known to host the Vela OB2 association as
well as several young clusters featuring OB and pre-main-sequence
stars. Several spatial and kinematic subgroups have been identified in
recent years. By grouping stars based on their positions and velocity,
we can address the question of the dynamical history of the region and
the mechanisms that drove stellar formation. The Gaia DR2 astrometry
and photometry enables us to characterise the 3D spatial and 3D
kinematic distribution of young stars and to estimate the ages of the
identified components. We used an unsupervised classification method
to group stars based on their proper motions and parallax. We studied
the expansion rates of the different identified groups based on 3D
velocities and on corrected tangential velocities. We used theoretical
isochrones to estimate ages. The young stars can be separated into
seven main groups of different ages and kinematical distribution. All
groups are found to be expanding, although the expansion is mostly not
isotropic. The size of the region, the age substructure, and the
anisotropic expansion rates are compatible with a prolonged period of
star formation in a turbulent molecular cloud. The current kinematics
of the stars cannot be explained by internal processes alone (such as
gas expulsion).
Description:
List of members of the young populations established in this study.
All columns from Gaia DR2 archive, except: probability (computed with
the code UPMASK) x,y,z (computed from Gaia DR2 ra,dec,parallax)
population (grouping from 1 to 7 as established in this study)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
listmemb.dat 554 11843 List of members of the young populations
established in this study
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
Byte-by-byte Description of file: listmemb.dat
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Bytes Format Units Label Explanations
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1- 18 F18.14 deg RAdeg Gaia DR2 Barycentric right ascension (ICRS)
at Ep=2015.5 (ra)
20- 38 F19.15 deg DEdeg Gaia DR2 Barycentric declination (ICRS)
at Ep=2015.5 (dec)
40- 58 I19 --- Source Gaia DR2 Unique source identifier
(source_id)
60- 77 F18.14 deg GLON Gaia DR2 Galactic longitude (l)
79-101 E23.19 deg GLAT Gaia DR2 Galactic latitude(b)
103-120 F18.16 mas Plx Gaia DR2 Absolute stellar parallax
(parallax)
122-141 F20.18 mas e_Plx Gaia DR2 Standard error of parallax
(parallax_error)
143-162 F20.16 mas/yr pmRA Proper motion in right ascension direction
(pmRA*cosDE) (pmra)
164-183 F20.18 mas/yr e_pmRA Standard error of proper motion in right
ascension direction (pmra_error)
185-203 F19.16 mas/yr pmDE Proper motion in declination direction
(pmdec)
205-224 F20.18 mas/yr e_pmDE Standard error of proper motion in
declination direction (pmdec_error)
226-238 E13.10 --- RADEcor Correlation between right ascension and
declination (radeccorr)
240-252 E13.10 --- RAPlxcor Correlation between right ascension and
parallax (raparallaxcorr)
254-266 E13.10 --- RApmRAcor Correlation between right ascension and
proper motion in right ascension
(rapmracorr
268-280 E13.10 --- RApmDEcor Correlation between right ascension and
proper motion in declination
(rapmdeccorr)
282-294 E13.10 --- DEPlxcor Correlation between declination and
parallax (decparallaxcorr)
296-308 E13.10 --- DEpmRAcor Correlation between declination and
proper motion in right ascension
(decpmracorr)
310-322 E13.10 --- DEpmDEcor Correlation between declination and
proper motion in declination
(decpmdeccorr)
324-336 E13.10 --- PlxpmRAcor Correlation between parallax and proper
motion in right ascension
(parallaxpmracorr)
338-350 E13.10 --- PlxpmDEcor Correlation between parallax and proper
motion in declination
(parallaxpmdeccorr)
352-364 E13.10 --- pmRApmDEcor Correlation between proper motion in
right ascension and proper motion in
declination (pmrapmdeccorr)
366-368 I3 --- o_Gmag Number of observations contributing to G
photometry (photgn_obs)
370-379 F10.7 mag Gmag G-band mean magnitude (Vega)
(photgmean_mag)
381-390 F10.7 mag BPmag ? Integrated BP mean magnitude (Vega) (bp)
392-401 F10.7 mag RPmag ? Integrated GP mean magnitude (Vega) (rp)
403-412 F10.7 mag Gmag2 G-band mean magnitude (Vega) (g)
414-426 E13.10 mag BP-RP ? BP-RP colour (bp_rp)
428-449 F22.18 km/s RV ? Gaia DR2 Spectroscopic radial velocity in
the solar barycentric reference frame
(radial_velocity)
451-470 F20.17 km/s e_RV ? Radial velocity error
(radialvelocityerror)
472-483 F12.6 --- chi2AL AL chi-square value (astrometricchi2al)
485-487 I3 --- NgAL Number of good observations AL
(astrometricngoodobsal)
489-497 F9.7 --- E(BR/RP) ? BP/RP excess factor
(photbprpexcessfactor)
499-517 F19.17 --- Prob Clustering score from UPMASK (probability)
519-528 F10.6 pc X Galactic X position (x)
530-540 F11.6 pc Y Galactic Y position (y)
542-552 E11.6 pc Z Galactic Z position (z)
554 I1 --- Pop [1/7] Population, see Sect. 5 (population)
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Acknowledgements:
Tristan Cantat-Gaudin, tcantat(at)fqa.ub.edu
(End) Patricia Vannier [CDS] 03-Jun-2019