2018A&A...616L..12F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:12:04

2018A&A...616L..12F - Astronomy and Astrophysics, volume 616, L12-12 (2018/8-1)

The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure.

FRANCIOSINI E., SACCO G.G., JEFFRIES R.D., DAMIANI F., ROCCATAGLIATA V., FEDELE D. and RANDICH S.

Abstract (from CDS):

Gaia-ESO Survey observations of the young Gamma Velorum cluster led to the discovery of two kinematically distinct populations, Gamma Vel A and B, respectively, with population B extended over several square degrees in the Vela OB2 association. Using the Gaia DR2 data for a sample of high-probability cluster members, we find that the two populations differ not only kinematically, but are also located at different distances along the line of sight, with the main cluster Gamma Vel A being closer. A combined fit of the two populations yields pA=2.895±0.008mas and pB=2.608±0.017mas, with intrinsic dispersions of 0.038±0.011mas and 0.091±0.016mas, respectively. This translates into distances of 345.4+1.0+12.4–1.0–11.5pc and 383.4+2.5+15.3–2.5–14.2pc, respectively, showing that Gamma Vel A is closer than Gamma Vel B by ∼38pc. We find that the two clusters are nearly coeval, and that Gamma Vel B is expanding. We suggest that Gamma Vel A and B are two independent clusters located along the same line of sight.

Abstract Copyright: © ESO 2018

Journal keyword(s): open clusters and associations: individual: Gamma Velorum - stars: late-type - stars: pre-main sequence - stars: distances - stars: kinematics and dynamics

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2457 G 07 54 54.448 +55 32 47.17   15.6       ~ 8 0
2 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 211 0
3 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 840 0
4 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 310 0
5 NAME Vela Field reg ~ ~           ~ 149 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:12:04

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