2019A&A...626A..17C -
Astronomy and Astrophysics, volume 626A, 17-17 (2019/6-1)
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. and JEFFRIES R.D.
Abstract (from CDS):
Context. 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. Aims. 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. Methods. 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. Results. 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. Conclusions. 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).
Journal keyword(s):
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
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<Available at CDS (J/A+A/626/A17): listmemb.dat>
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
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D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
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FK4
coord.
(ep=B1950 eq=1950) :
07 05 57.3258 -37 39 51.872
[
]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
Gal
coord.
(ep=J2000) :
248.8024842 -13.2530873
[
]
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References (4 between 1850 and 2020) (Total 4)
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