2015A&A...574L...7S

Query : 2015A&A...574L...7S

2015A&A...574L...7S - Astronomy and Astrophysics, volume 574L7-7 (2015/2-1)

The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association.

SACCO G.G., JEFFRIES R.D., RANDICH S., FRANCIOSINI E., JACKSON R.J., COTTAAR M., SPINA L., PALLA F., MAPELLI M., ALFARO E.J., BONITO R., DAMIANI F., FRASCA A., KLUTSCH A., LANZAFAME A., BAYO A., BARRADO D., JIMENEZ-ESTEBAN F., GILMORE G., MICELA G., VALLENARI A., ALLENDE PRIETO C., FLACCOMIO E., CARRARO G., COSTADO M.T., JOFRE P., LARDO C., MAGRINI L., MORBIDELLI L., PRISINZANO L. and SBORDONE L.

Abstract (from CDS):

The nearby (distance∼350-400pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15Myr) cluster immediately surrounding γ2 Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35Myr cluster located two degrees south of γ2 Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distinct from and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a colour-magnitude diagram of this secondary population are consistent with those of one of the components discovered around γ2 Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around γ2 Velorum that expanded after gas expulsion or formed in a less dense environment that is spread over the whole Vela OB2 region.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: pre-main sequence - techniques: spectroscopic - stars: individual: gamma2 Velorum - open clusters and associations: individual: Vela OB2 - open clusters and associations: individual: NGC 2547

VizieR on-line data: <Available at CDS (J/A+A/574/L7): table1.dat>

Simbad objects: 79

goto Full paper

goto View the references in ADS

Number of rows : 79
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J08073463-4904107 Y*O 08 07 34.6245987240 -49 04 10.778674296       14.46 13.59 K4.8 20 0
2 2MASS J08073999-4903023 Y*O 08 07 39.9941609448 -49 03 02.341782900       16.58 15.11 ~ 13 0
3 2MASS J08074194-4908306 Y*O 08 07 41.9362992240 -49 08 30.734833740       17.40 16.02 ~ 8 0
4 2MASS J08074750-4911093 Y*O 08 07 47.5066254432 -49 11 09.450408480       18.26 16.45 ~ 13 0
5 2MASS J08081196-4930268 Y*O 08 08 11.9655615240 -49 30 26.873292348       17.75 16.05 ~ 13 0
6 2MASS J08081758-4914493 Y*O 08 08 17.5845917568 -49 14 49.365590532       16.95 15.40 ~ 16 0
7 2MASS J08082095-4902029 Y*O 08 08 20.9562601272 -49 02 03.048377856       15.95 14.68 ~ 13 0
8 2MASS J08082690-4859131 Y*O 08 08 26.9023759320 -48 59 13.171638804       14.76 13.99 K3.4 24 0
9 2MASS J08083389-4907176 Y*O 08 08 33.8970208272 -49 07 17.704690644   16.063 14.93 14.20 13.76 K2.7 24 0
10 2MASS J08083830-4932320 Y*O 08 08 38.3040457800 -49 32 32.056393344       16.72 15.39 M1.8 20 0
11 2MASS J08083910-4904025 Y*O 08 08 39.1088679144 -49 04 02.547776100     17.73 16.63 15.09 ~ 13 0
12 2MASS J08083983-4855229 Y*O 08 08 39.8301262416 -48 55 22.954094580       18.34 16.56 ~ 10 0
13 2MASS J08084459-4934202 Y*O 08 08 44.5912213488 -49 34 20.291650896       13.46 12.82 ~ 10 0
14 Cl* NGC 2547 NTJ 7-2323 LM* 08 09 00.2278100976 -49 20 33.290298708   15.692 14.596 13.940 13.370 K1.4 30 0
15 2MASS J08090250-4858172 Y*O 08 09 02.5063872816 -48 58 17.289559668     13.13 12.73 12.32 G6-G7 45 0
16 2MASS J08090287-4906022 Y*O 08 09 02.8786573008 -49 06 02.208636972   12.280 11.782 11.494 11.257 ~ 27 0
17 GES J08090471-4933274 LM* 08 09 04.7150242272 -49 33 27.482124456     17.39 16.51 14.86 ~ 17 0
18 Cl* NGC 2547 JND 7-58 LM* 08 09 07.2178616698 -49 19 14.489251112   16.130 15.035 14.680 13.61 K5e 32 0
19 GES J08091025-4902250 LM* 08 09 10.2616317288 -49 02 25.032880248     16.06 15.25 14.11 K5.9 26 0
20 2MASS J08091307-4925401 Y*O 08 09 13.0790993112 -49 25 40.237432392   14.881 13.99 13.44 12.99 K3 28 0
21 2MASS J08091332-4857599 Y*O 08 09 13.3234544664 -48 58 00.024654540     13.90 13.32 12.88 ~ 14 0
22 GES J08091385-4933181 LM* 08 09 13.8546897360 -49 33 18.190440720     18.34 17.28 15.60 ~ 16 0
23 2MASS J08091657-4909309 Y*O 08 09 16.5797549880 -49 09 31.053557160   17.494 16.102 15.203 14.235 K4.3 30 0
24 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 307 0
25 2MASS J08092276-4916309 Y*O 08 09 22.7641869432 -49 16 30.918655380   14.433 13.608 13.080 12.696 ~ 30 0
26 2MASS J08092293-4907575 Y*O 08 09 22.9411497384 -49 07 57.522822708   12.717 12.189 11.870 11.564 ~ 32 0
27 GES J08092586-4932443 LM* 08 09 25.8691014048 -49 32 44.311788996     16.99 16.07 14.66 ~ 14 0
28 * gam01 Vel Y*O 08 09 29.3175369840 -47 20 43.013412312   3.995 4.173     B2III 158 0
29 * 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 951 0
30 Cl* NGC 2547 JND 18-593 LM* 08 09 34.4385213288 -49 06 02.726186868     19.526 18.183 16.353 ~ 18 0
31 2MASS J08094083-4923503 Y*O 08 09 40.8279601320 -49 23 50.360359056   14.012 13.295 12.949 12.441 ~ 30 0
32 2MASS J08094507-4856307 Y*O 08 09 45.0820044576 -48 56 30.799151916     12.41   11.77 ~ 27 0
33 Cl* NGC 2547 NTJ 8-2705 LM* 08 09 45.5573372328 -49 17 36.487679676   17.773 16.311 15.338 14.358 M0e 29 0
34 2MASS J08094684-4907198 Y*O 08 09 46.8438412704 -49 07 19.882005384   13.326 12.704 12.284 11.967 ~ 30 0
35 2MASS J08094807-4936236 Y*O 08 09 48.0773974560 -49 36 23.672630016       13.89 13.41 ~ 8 0
36 GES J08095507-4858140 LM* 08 09 55.0752305520 -48 58 14.143955448     16.08 15.24 14.34 K4.3 25 0
37 Cl* NGC 2547 NTJ 8-1868 LM* 08 09 56.4410630112 -49 22 10.939502676   17.299 15.915 15.093 14.187 M0e 32 0
38 2MASS J08095786-4849182 Y*O 08 09 57.8595214272 -48 49 18.262425936       13.43 12.94 ~ 24 0
39 2MASS J08095939-4859111 Y*O 08 09 59.4039355272 -48 59 11.231332764     13.94 13.45 12.98 ~ 10 0
40 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
41 GES J08100204-4939564 LM* 08 10 02.0430960000 -49 39 56.531926296     15.75 14.90 14.18 ~ 12 0
42 2MASS J08100380-4901071 Y*O 08 10 03.8007196224 -49 01 07.152159576   13.124 12.543   11.803 ~ 19 0
43 Cl* NGC 2547 NTJ 3-1984 LM* 08 10 07.4817998736 -49 10 44.741318304   17.675 16.279 15.351 14.415 M0e 33 0
44 2MASS J08100810-4912157 Y*O 08 10 08.0818002864 -49 12 15.831886428   14.168 13.365 12.901 12.402 K1.1 20 0
45 Cl* NGC 2547 JND 13-174 LM* 08 10 08.9346530880 -49 15 41.412828312   16.767 15.479 14.776 13.981 K3.9 34 0
46 2MASS J08101223-4913056 Y*O 08 10 12.2262943584 -49 13 05.656971324   13.116 12.542 12.176 11.866 ~ 34 0
47 2MASS J08101546-4905487 Y*O 08 10 15.4544865840 -49 05 48.737577876   13.211 12.539   11.692 ~ 22 0
48 2MASS J08101697-4854194 Y*O 08 10 16.9663287000 -48 54 19.440618264       12.91 12.51 ~ 24 0
49 2MASS J08101799-4923502 Y*O 08 10 17.9925966720 -49 23 50.339364828   14.785 13.899 13.396 12.898 ~ 33 0
50 GES J08101811-4858252 LM* 08 10 18.1118327016 -48 58 25.279025664     17.88 16.80 15.30 ~ 14 0
51 2MASS J08101987-4856000 Y*O 08 10 19.8708372648 -48 56 00.041553780     14.64 14.01 13.34 K2.7 14 0
52 2MASS J08102172-4845417 Y*O 08 10 21.7158263280 -48 45 41.723456112       13.57 12.92 ~ 10 0
53 2MASS J08102486-4901495 Y*O 08 10 24.8681124264 -49 01 49.531938348   13.47 12.66 12.305 11.933 ~ 31 0
54 2MASS J08102704-4908487 Y*O 08 10 27.0453548256 -49 08 48.807005532   14.09 13.24 12.73 12.373 ~ 34 0
55 2MASS J08102854-4856518 Y*O 08 10 28.5389072280 -48 56 51.850596012   14.474 12.62   11.89 ~ 33 0
56 Cl* NGC 2547 NTJ 8-729 LM* 08 10 31.8638677176 -49 21 29.724656400   16.481 15.230 14.408 13.655 K3.4 34 0
57 2MASS J08103470-4908399 Y*O 08 10 34.7071349760 -49 08 40.033783140   12.931 12.390 12.092 11.703 ~ 34 0
58 Cl* NGC 2547 JND 13-156 LM* 08 10 35.7208376904 -49 09 00.874241712   17.335 15.988 15.201 14.239 M0e 31 0
59 2MASS J08103812-4912284 Y*O 08 10 38.1305920056 -49 12 28.539499932   15.421 14.443 13.770 13.262 K0.5 32 0
60 2MASS J08103930-4929046 Y*O 08 10 39.2967081792 -49 29 04.666946784     15.77 14.91 13.82 K9.5 20 0
61 Cl* NGC 2547 NTJ 18-618 LM* 08 10 43.3601112024 -49 01 15.275395632   16.687 15.464 14.752 13.951 K3.1 28 0
62 2MASS J08104437-4939001 Y*O 08 10 44.3773772208 -49 39 00.127783044       18.57 16.78 ~ 12 0
63 2MASS J08104546-4901068 Y*O 08 10 45.4575224376 -49 01 06.821384592   12.85 12.11   11.506 ~ 32 0
64 2MASS J08104554-4905204 Y*O 08 10 45.5376710952 -49 05 20.410983672   14.725 13.759 13.277 12.643 ~ 16 0
65 2MASS J08104984-4911258 Y*O 08 10 49.8496128120 -49 11 25.861858188   12.238 11.769   11.165 ~ 26 0
66 2MASS J08110009-4906442 Y*O 08 11 00.0968303568 -49 06 44.269894692   14.03 13.29 12.87 12.48 ~ 28 0
67 2MASS J08110139-4900088 Y*O 08 11 01.4042635944 -49 00 08.889965352     13.47 13.06 12.57 ~ 29 0
68 2MASS J08110234-4916249 Y*O 08 11 02.3435797632 -49 16 24.940089948   13.781 13.088 12.635 12.279 ~ 28 0
69 2MASS J08110403-4852137 Y*O 08 11 04.0349789376 -48 52 13.807931628       14.19 13.51 ~ 12 0
70 2MASS J08110435-4853491 Y*O 08 11 04.3612135680 -48 53 49.178972328       14.49 13.81 ~ 10 0
71 Cl* NGC 2547 NTJ 9-1706 LM* 08 11 07.5958019808 -49 21 42.255483804   18.733 17.279 16.244 14.783 ~ 18 0
72 2MASS J08112074-4913100 Y*O 08 11 20.7374704248 -49 13 10.012706148   12.64 12.02 11.75 11.37 ~ 12 0
73 2MASS J08112121-4913280 Y*O 08 11 21.2209249944 -49 13 28.077114828     13.07 12.77 12.32 ~ 8 0
74 Cl* NGC 2547 NTJ 9-2368 LM* 08 11 22.1372302920 -49 21 47.099398176   17.477 16.049 15.110 14.152 ~ 15 0
75 2MASS J08112560-4927206 Y*O 08 11 25.6055728632 -49 27 20.570201280     18.50 17.23 15.63 ~ 12 0
76 2MASS J08112894-4921190 Y*O 08 11 28.9381295400 -49 21 18.982354104     18.38 17.19 15.52 ~ 12 0
77 2MASS J08113190-4930135 Y*O 08 11 31.90368 -49 30 13.5684     17.86   14.97 ~ 8 0
78 2MASS J08115134-4911410 Y*O 08 11 51.3505716552 -49 11 41.038291752   13.849 13.14 12.65 12.27 ~ 18 0
79 2MASS J08115737-4911322 Y*O 08 11 57.3849348336 -49 11 32.270942904     13.09   12.28 ~ 22 0

To bookmark this query, right click on this link: simbad:objects in 2015A&A...574L...7S and select 'bookmark this link' or equivalent in the popup menu