2001A&A...366L...1R

Query : 2001A&A...366L...1R

2001A&A...366L...1R - Astronomy and Astrophysics, volume 366, L1-4 (2001/2-1)

The WR content of IC 10 - first detection of WC 9 stars in a low metallicity environment?

ROYER P., SMARTT S.J., MANFROID J. and VREUX J.-M.

Abstract (from CDS):

We present deep, narrow-band photometry of the Local Group starburst galaxy IC 10. Our dedicated photometric system provides detection of 13 new Wolf-Rayet (WR) stars and allows spectral subtypes to be assigned. Three of these new stars appear to be WC 9 subtypes. If confirmed, these would be the very first WC 9 stars ever detected in a low metallicity environment, hence putting strong new constraints on the formation and evolution models of massive stars. Eight of the new WR stars are of the WC subtype, which does not significantly modify the anomalously high WC/WN ratio in IC 10. However it is likely that a number of Wolf-Rayet stars of the WNE and WC spectral subtypes are still to be discovered in the heart of the galaxy.

Abstract Copyright: ∼

Journal keyword(s): stars: Wolf-Rayet - photometry: narrow bands - galaxies: starburst, Local Group

Nomenclature: Table 2: RSMV NN (Nos 1-13).

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 LGGS J001956.99+591707.5 WR* 00 19 56.99 +59 17 07.5 21.74 22.11 21.47 21.05 20.71 WC4.5 8 0
2 [MAC92] 2 WR* 00 19 59.72 +59 16 55.2           WC4 9 0
3 RSMV 6 WR* 00 20 03.01 +59 18 27.0   23.28 22.20 21.38 20.59 WC4 6 0
4 RSMV 5 WR* 00 20 04.32 +59 18 06.5 22.25 22.52 21.66 21.1 20.53 WC4.5 4 0
5 RSMV 7 WR* 00 20 11.30 +59 18 54.4           WC? 1 0
6 LGGS J002011.55+591857.9 WR* 00 20 11.55 +59 18 57.9 19.92 20.31 19.62 19.12 18.61 WC4.5 8 0
7 LGGS J002012.84+592008.1 WR* 00 20 12.84 +59 20 08.1 22.24 22.54 21.59 21.15 21.26 WNe 8 0
8 RSMV 13 WR* 00 20 15.70 +59 17 22.1           WN5 5 0
9 RSMV 9 WR* 00 20 20.41 +59 18 40.1           WNE 5 0
10 RSMV 8 WR* 00 20 20.56 +59 18 37.3 20.38 20.92 20.24 19.63 19.18 WN10 6 0
11 RSMV 1 WR* 00 20 21.60 +59 17 14.3           WC? 1 0
12 [MAC92] 7 WR* 00 20 21.8561110224 +59 17 40.979965524 19.13 19.76 19.09 18.64 18.19 WC4/5 13 0
13 RSMV 4 WR* 00 20 22.03 +59 17 55.6           WC? 1 0
14 RSMV 11 WR* 00 20 22.82 +59 17 53.9   23.96 22.8 22.15 20.92 WC4 6 0
15 LGGS J002023.35+591742.2 WR* 00 20 23.35 +59 17 42.2 21.25 20.93 20.52 20.04 19.94 WC7 12 0
16 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1119 1
17 RSMV 12 WR* 00 20 25.77 +59 16 48.9   23.53 22.7 21.93 21.31 WNE 9 0
18 LGGS J002026.20+591726.3 WR* 00 20 26.18 +59 17 26.3 21.77 22.23 21.15 20.19 18.85 WC4 11 0
19 RSMV 10 WR* 00 20 26.63 +59 17 05.6   23.21 22.63 21.74 22.22 WC4 10 0
20 LGGS J002026.69+591732.8 mul 00 20 26.69 +59 17 32.8 20.95 21.43 20.89 20.34 19.72 WC? 10 0
21 LGGS J002026.94+591719.9 mul 00 20 26.94 +59 17 19.9 21.18 21.19 20.61 19.97 19.07 WC? 9 0
22 RSMV 2 WR* 00 20 28.0451666928 +59 17 14.194661604 22.06 22.32 21.54 20.84 20.13 WN7/8 9 0
23 RSMV 3 WR* 00 20 28.83 +59 17 43.4           WC? 1 0
24 LGGS J002034.52+591714.6 WR* 00 20 34.52 +59 17 14.6 22.88 22.59 22.17 21.58 21.09 WC5 10 0
25 LGGS J002041.61+591624.8 WR* 00 20 41.61 +59 16 24.8   23.11 22.75 22.19 21.73 WN4 8 0
26 NAME Local Group GrG ~ ~           ~ 8392 0

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