2007A&A...468..233M


Query : 2007A&A...468..233M

2007A&A...468..233M - Astronomy and Astrophysics, volume 468, 233-254 (2007/6-2)

Stellar and wind properties of massive stars in the central parsec of the Galaxy.

MARTINS F., GENZEL R., HILLIER D.J., EISENHAUER F., PAUMARD T., GILLESSEN S., OTT T. and TRIPPE S.

Abstract (from CDS):

How star formation proceeds in the Galactic Center is a debated question. Addressing this question will help us understand the origin of the cluster of massive stars near the supermassive black hole, and more generally, starburst phenomena in galactic nuclei. In that context, it is crucial to know the properties of young massive stars in the central parsec of the Galaxy. The main goal of this study is to derive the stellar and wind properties of the massive stars orbiting the supermassive black hole SgrA* in two counter-rotating disks. We use non-LTE atmosphere models including winds and line-blanketing to reproduce H and K band spectra of these stars obtained with SINFONI on the ESO/VLT. The GC massive stars appear to be relatively similar to other Galactic stars. The currently known population of massive stars emit a total 6.0x1050s–1 (resp. 2.3x1049s–1) H (resp. HeI) ionising photons. This is sufficient to produce the observed nebular emission and implies that, in contrast to previous claims, no peculiar stellar evolution is required in the Galactic Center. We find that most of the Ofpe/WN9 stars are less chemically evolved than initially thought. The properties of several WN8 stars are given, as well as two WN/C stars confirmed quantitatively to be stars in transition between the WN and WC phase. We propose the sequence (Ofpe/WN9←>LBV)->WN8->WN/C for most of the observed GC stars. Quantitative comparison with stellar evolutionary tracks including rotation favour high mass loss rates in the Wolf-Rayet phase in these models. In the OB phase, these tracks nicely reproduce the average properties of bright supergiants in the Galactic Center.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: Wolf-Rayet - stars: atmospheres - stars: fundamental parameters - stars: winds, outflows - Galaxy: center

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15990 1
2 HD 62910 WR* 07 44 58.2217347768 -31 54 29.554957188 10.08 10.44 10.10 10.17   WN6/WC4 123 0
3 [BSD96] 33 WR* 17 45 39.54 -29 00 35.0           Ofpe/WN9 40 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12905 0
5 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 110 0
6 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 56 0
7 GCIRS 34NW WR* 17 45 39.749 -29 00 25.36           WN7 19 0
8 GCIRS 13E4 WR* 17 45 39.7974 -29 00 29.503           WC9 28 0
9 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 42 0
10 GCIRS 7W WR* 17 45 39.86 -29 00 22.2           WC9 36 0
11 GCIRS 15SW WR* 17 45 39.92 -29 00 18.1           WN8/WC9 36 0
12 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 329 0
13 GCIRS 33SE Em* 17 45 40.02 -29 00 31.0           Ofpe/WN9 24 0
14 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3865 3
15 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 129 0
16 GCIRS 33E WR* 17 45 40.0941 -29 00 31.213           Ofpe/WN9 53 0
17 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 175 1
18 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 150 0
19 GCIRS 15NE WR* 17 45 40.15 -29 00 16.5           WN8/9 55 0
20 GCIRS 9W WR* 17 45 40.26 -29 00 33.7           WN8 30 0
21 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 43 0
22 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 145 0
23 GCIRS 7SE * 17 45 40.2638 -29 00 24.703           ~ 20 0
24 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 472 2
25 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 685 0
26 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 490 0
27 HD 164270 WR* 18 01 43.1453595672 -32 42 55.161329040 8.52 8.97 8.74 9.51   WC9d+? 221 0
28 EM* AS 422 WR* 20 32 06.2786571432 +40 48 29.527101576   13.46 11.83     WN7o/CE+O7V(f) 98 0
29 GCIRS 7E2 * ~ ~           ~ 13 0

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2022.05.23-10:11:38

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