2019A&A...627A.170M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET02:47:27

2019A&A...627A.170M - Astronomy and Astrophysics, volume 627A, 170-170 (2019/7-2)

Massive stars in the young cluster VVV CL074.

MARTINS F., CHENE A.-N., BOURET J.-C., BORISSOVA J., GROH J., RAMIREZ ALEGRIA S. and MINNITI D.

Abstract (from CDS):

Context. The evolution of massive stars is not fully constrained. Studies of young massive clusters hosting various populations of massive stars can help refine our understanding of the life and fate of massive stars. Aims. In this context, our goal is to study the massive stellar content of the young massive cluster VVV CL074. Methods. We obtained K-band spectroscopy of the brightest cluster members in order to identify the massive star population. We also determined the stellar properties of the cluster's massive stars to better quantify the evolutionary sequences linking different types of massive stars. We collected integral field spectroscopy of selected fields in the cluster VVV CL074 with SINFONI on the ESO/VLT. We performed a spectral classification based on the K-band spectra and comparison to infrared spectral atlases. We determined the stellar parameters of the massive stars from analysis with atmosphere models computed with the code CMFGEN. Results. We uncover a population of 25 early-type (OB and Wolf-Rayet) stars, 19 being newly discovered by our observations out of which 15 are likely cluster members. The cluster's spectrophotometric distance is 10.2±1.6kpc, placing it close to the intersection of the galactic bar and the Norma arm, beyond the galactic center. This makes VVV CL074 one the farthest young massive clusters identified so far. Among the massive stars population, three objects are Wolf-Rayet stars, the remaining are O and B stars. From the Hertzsprung-Russell diagram we find that most stars have an age between 3 and 6Myr according to the Geneva evolutionary tracks. WN8 and WC8-9 stars are the descendants of stars with initial masses between 40 and 60M. The massive star population of VVV CL074 is very similar to that of the cluster DBS2003-179 and to a lesser extent to that of the Quintuplet cluster, indicating the same age. The central cluster of the Galaxy is ∼3Myr older. From the comparison of the massive stars populations in these four clusters, one concludes that galactic stars with an initial mass in the range 40-60M likely go through a WN8-9 phase.

Abstract Copyright: © F. Martins et al. 2019

Journal keyword(s): stars: massive - stars: evolution - open clusters and associations: general - stars: fundamental parameters

Nomenclature: Table 1: [CBB2013] VVV CL074 NN (Nos 12-51) added.

Simbad objects: 55

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Number of rows : 55

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [CBB2013] VVV CL074 12 s*b 06 32 07.080 -47 49 39.83           B0.5-2I 1 0
2 NAME Nor Arm PoG 16 00 -50.0           ~ 354 0
3 [CBB2013] VVV CL074 26 * 16 32 03.050 -47 49 42.59           CO 1 0
4 [CBB2013] VVV CL074 27 * 16 32 03.120 -47 49 45.59           CO 1 0
5 [CBB2013] VVV CL074 24 s*b 16 32 03.380 -47 49 08.01           B7+I 1 0
6 [CBB2013] VVV CL074 28 * 16 32 03.400 -47 49 42.34           B 1 0
7 [CBB2013] VVV CL074 25 * 16 32 03.480 -47 49 09.51           CO 1 0
8 [CBB2013] VVV CL074 30 * 16 32 03.810 -47 49 32.46           CO 1 0
9 [CBB2013] VVV CL074 29 * 16 32 04.100 -47 49 32.21           CO 1 0
10 [CBB2013] VVV CL074 23 * 16 32 04.440 -47 49 07.51           CO 1 0
11 [CBB2013] VVV CL074 49 s*b 16 32 04.840 -47 49 31.41           O7-9.5I 1 0
12 [CBB2013] VVV CL074 50 s*b 16 32 04.860 -47 49 33.41           O7-9.5I 1 0
13 [CBB2013] VVV CL074 44 * 16 32 04.880 -47 49 21.21           B 1 0
14 [CBB2013] VVV CL074 31 * 16 32 04.990 -47 49 51.64           CO 1 0
15 [CBB2013] VVV CL074 33 * 16 32 05.270 -47 49 45.01           CO 1 0
16 [CBB2013] VVV CL074 41 * 16 32 05.270 -47 49 22.96           B3+ 1 0
17 [CBB2013] VVV CL074 43 * 16 32 05.270 -47 49 17.46           CO 1 0
18 WR 75-27 WR* 16 32 05.27 -47 49 14.3           WC8 4 0
19 [CBB2013] VVV CL074 42 * 16 32 05.340 -47 49 17.21           O7-8III-I 1 0
20 [CBB2013] VVV CL074 34 * 16 32 05.340 -47 49 40.01           ~ 1 0
21 WR 75-28 WR* 16 32 05.46 -47 49 28.1           WN8 4 0
22 [CBB2013] VVV CL074 4 s*b 16 32 05.47 -47 49 34.0           O7-9.5I 2 0
23 [CBB2013] VVV CL074 32 * 16 32 05.550 -47 49 49.89           B 1 0
24 [CBB2013] VVV CL074 6 s*b 16 32 05.55 -47 49 33.2           O8-O9III 2 0
25 [CBB2013] VVV CL074 51 * 16 32 05.620 -47 49 32.56           O6-8III 1 0
26 [CBB2013] VVV CL074 7 * 16 32 05.67 -47 49 30.0           O7-8III 3 0
27 [CBB2013] VVV CL074 8 RG* 16 32 05.86 -47 49 30.5           M2-3III 2 0
28 WR 75-29 s*b 16 32 05.93 -47 49 30.9           WN7/O4-6If+ 4 0
29 VVV CL074 OpC 16 32 06 -47 49.5           ~ 7 0
30 [CBB2013] VVV CL074 38 * 16 32 06.260 -47 49 21.33           CO 1 0
31 [CBB2013] VVV CL074 36 * 16 32 06.370 -47 49 43.71           CO 1 0
32 [CBB2013] VVV CL074 39 * 16 32 06.460 -47 49 24.83           B? 1 0
33 [CBB2013] VVV CL074 45 * 16 32 06.520 -47 49 12.93           CO 1 0
34 [CBB2013] VVV CL074 40 * 16 32 06.530 -47 49 22.58           CO 1 0
35 [CBB2013] VVV CL074 37 * 16 32 06.550 -47 49 43.83           ~ 1 0
36 [CBB2013] VVV CL074 35 * 16 32 06.660 -47 49 52.21           CO 1 0
37 [CBB2013] VVV CL074 20 * 16 32 07.220 -47 49 31.79           B3+ 1 0
38 [CBB2013] VVV CL074 21 * 16 32 07.430 -47 49 29.79           B3+ 1 0
39 [CBB2013] VVV CL074 18 s*b 16 32 07.610 -47 49 21.17           O9.5-B2I 1 0
40 [CBB2013] VVV CL074 19 * 16 32 07.670 -47 49 33.79           CO 1 0
41 [CBB2013] VVV CL074 22 * 16 32 07.770 -47 49 31.54           CO 1 0
42 [CBB2013] VVV CL074 15 * 16 32 07.970 -47 49 45.03           CO 1 0
43 [CBB2013] VVV CL074 46 * 16 32 08.120 -47 49 07.18           CO 1 0
44 [CBB2013] VVV CL074 17 * 16 32 08.210 -47 49 42.45           O7-8V-III 1 0
45 [CBB2013] VVV CL074 47 * 16 32 08.400 -47 49 07.31           OB 1 0
46 [CBB2013] VVV CL074 16 * 16 32 08.410 -47 49 41.95           CO 1 0
47 [CBB2013] VVV CL074 13 WR* 16 32 08.430 -47 49 44.70           WC9 1 0
48 [CBB2013] VVV CL074 14 * 16 32 08.500 -47 49 46.08           CO 1 0
49 [CBB2013] VVV CL074 48 * 16 32 08.680 -47 49 32.41           ~ 1 0
50 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 19 0
51 VVV CL086 OpC 16 48 15 -45 26.1           ~ 9 0
52 [DBS2003] 179 OpC 17 11 32.0 -39 10 38           ~ 35 0
53 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 649 0
54 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 462 0
55 WR 102ha WR* 17 46 15.86544 -28 49 45.6312           WC8/9d+OB 55 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-02:47:27

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