1997A&A...325..700N

Query : 1997A&A...325..700N

1997A&A...325..700N - Astronomy and Astrophysics, volume 325700-708 (1997/9-2)

Quantitative spectroscopy of the HeI cluster in the Galactic Center.

NAJARRO F., KRABBE A., GENZEL R., LUTZ D., KUDRITZKI R.P. and HILLIER D.J.

Abstract (from CDS):

We present first results on quantitative infrared spectroscopy of the brightest HeI emission line stars in the Galactic center. The observed HeI and H broad emission lines are caused by extremely strong stellar winds ({dot}(M)∼5 to 80x10–5M☉/yr) with relatively small outflow velocities (V∞∼300 to 1000km/s). The effective temperatures of the objects range from 17,000K to 30,000K with corresponding stellar luminosities of 1 to 30x105L☉. Strongly enhanced helium abundances (NHe/NH>.5) are found. These results indicate that the HeI emission line stars are evolved blue supergiants close to the evolutionary stage of Wolf-Rayet stars. They power the central parsec and belong to a young stellar cluster of massive stars which formed a few million years ago.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - stars: mass-loss - stars: supergiants - stars: emission-line - Galaxy: center - infrared: stars

Nomenclature: GCIRS NNWN No. 13E1

Simbad objects: 21

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Number of rows : 21
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 [HS80] B5 WR* 01 32 37.72 +30 40 05.6 16.445 17.498 17.627 17.447 17.473 Ofpe/WN9 35 0
2 HD 86161 WR* 09 54 52.9033957968 -57 43 38.274644604 7.94 8.65 8.36 8.93   WN8h 230 0
3 CPD-33 4347 WR* 17 18 49.7249262168 -33 57 41.388161760   13.93 12.56 12.21   WN8/WC9 69 0
4 NAME Sgr A West HII 17 45 39.4 -29 00 24           ~ 381 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 133 0
7 GCIRS 13E1 s*b 17 45 39.8166 -29 00 29.730           B0/1I 39 0
8 GCIRS 7W WR* 17 45 39.86 -29 00 22.2           WC9 39 0
9 GCIRS 15SW WR* 17 45 39.92 -29 00 18.1           WN8/WC9 41 0
10 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 144 0
11 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 197 1
12 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 167 0
13 GCIRS 15NE WR* 17 45 40.15 -29 00 16.5           WN8/9 62 0
14 GCIRS 16SE1 WR* 17 45 40.181 -29 00 29.26           WC8/9 50 0
15 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 50 0
16 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 156 0
17 NAME Sgr A East SNR 17 45 41 -29 00.8           ~ 523 2
18 HD 316285 s*b 17 48 14.0372119152 -28 00 53.121269592 11.88 11.27 9.60 9.28   B0Ieq 197 2
19 EM* AS 268 WR* 18 02 23.4574037952 -23 34 37.491692196   14.38 12.31 11.43   WN9h 106 0
20 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1316 2
21 HD 177230 WR* 19 03 59.0233422072 -04 19 01.910240688 11.32 11.60 11.12     WN8 177 0

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