2003A&A...404..483C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET14:51:22

2003A&A...404..483C - Astronomy and Astrophysics, volume 404, 483-493 (2003/6-3)

Gemini observations of Wolf-Rayet stars in the Local Group starburst galaxy IC 10.

CROWTHER P.A., DRISSEN L., ABBOTT J.B., ROYER P. and SMARTT S.J.

Abstract (from CDS):

We present Gemini-N GMOS and CFHT MOS spectroscopy of Wolf-Rayet candidates in the Local Group dwarf galaxy IC 10 that were previously identified by Massey et al. (1992AJ....103.1159M) and Royer et al. (2001A&A...366L...1R). From the present spectroscopic survey, the WC/WN ratio for IC 10 remains unusually high, given its low metallicity, although none of the WC9 stars suspected from narrow-band imaging are confirmed. Our spectroscopy confirms 9 newly discovered Wolf-Rayet candidates from Royer et al. (2001A&A...366L...1R), whilst spectral types of 14 Wolf-Rayet stars previously observed by Massey & Armandroff (1995AJ....109.2470M) are refined here. In total, there are 26 spectroscopically confirmed Wolf-Rayet stars in IC 10. All but one of the fourteen WC stars are WC4-6 stars, the exception being #10 from Massey et al. (1992AJ....103.1159M), a broad-lined, apparently single WC7 star. There are a total of eleven WN stars, which are predominantly early WN3-4 stars, but include a rare WN10 star, #8 from Royer et al. (2001A&A...366L...1R) #5 from Massey et al. (1992AJ....103.1159M) is newly identified as a transition WN/C star. Consequently, the WC/WN ratio for IC10 is 14/11∼1.3, unusually high for a metal-poor galaxy. Re-evaluating recent photometric data of Massey & Holmes (2002ApJ...580L..35M), we suggest that the true WC/WN ratio may not be as low as ∼0.3. Finally, we present ground-based finding charts for all confirmed WR stars, plus HST/WFPC2 charts for twelve cases.

Abstract Copyright:

Journal keyword(s): galaxies: individual: IC 10 - galaxies: starburst - stars: evolution - stars: Wolf-Rayet

Nomenclature: Table 1: [MAC92] NN-A N=11 added, RSMV NN-A (Nos 2-A, 2-B) added.

Simbad objects: 41

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Number of rows : 41

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#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 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
6 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
7 RSMV 13 WR* 00 20 15.70 +59 17 22.1           WN5 5 0
8 [MAC92] 6 WR* 00 20 20.39 +59 18 41.8           WN 4 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 [MAC92] 7 WR* 00 20 22.01 +59 17 41.6           WC4.5 9 0
12 LGGS J002022.68+591846.8 WR* 00 20 22.68 +59 18 46.8   23.45 23.22 22.66   WN3 8 0
13 RSMV 11 WR* 00 20 22.82 +59 17 53.9   23.96 22.8 22.15 20.92 WC4 6 0
14 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 983 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 RSMV 12 WR* 00 20 25.77 +59 16 48.9   23.53 22.7 21.93 21.31 WNE 9 0
17 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
18 [MAC92] 13-B * 00 20 26.62 +59 17 33.4     23.1     ~ 2 0
19 RSMV 10 WR* 00 20 26.63 +59 17 05.6   23.21 22.63 21.74 22.22 WC4 9 0
20 [MAC92] 13-A WR* 00 20 26.63 +59 17 33.2     20.8     WC5.5 2 0
21 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
22 [MAC92] 14-A WR* 00 20 26.87 +59 17 20.2     20.7     WC5 3 0
23 [MAC92] 14-B * 00 20 26.91 +59 17 20.3     22.4     ~ 2 0
24 LGGS J002027.02+591818.0 WR* 00 20 27.02 +59 18 18.0   22.95 22.27 21.69 21.14 ~ 9 0
25 [VSG2007] 8 * 00 20 27.447 +59 17 35.84     22.0   21.14 OV 4 0
26 [MAC92] 24-A mul 00 20 27.67 +59 17 37.7     18.8     WN+OB 4 0
27 [MAC92] 24 mul 00 20 27.73 +59 17 37.2           WN 11 0
28 [MAC92] 24-B mul 00 20 27.82 +59 17 37.5     21.3     ~ 4 0
29 RSMV 2-A WR* 00 20 28.00 +59 17 14.6     21.4     WN7 1 0
30 RSMV 2-B * 00 20 28.04 +59 17 14.9     25.1     ~ 1 0
31 RSMV 2 Em* 00 20 28.0450801719 +59 17 14.195814778 22.06 22.32 21.54 20.84 20.13 WN? 9 0
32 [MAC92] 17-B * 00 20 28.98 +59 16 51.9     22.2     OB 4 0
33 [MAC92] 17-A WR* 00 20 29.05 +59 16 52.3     22.5     WNE 14 0
34 [MAC92] 17 mul 00 20 29.15 +59 16 52.2     21.76     WNE+OB 14 0
35 [MAC92] 19-A WR* 00 20 31.01 +59 19 04.5     22.6     WN4 1 0
36 [MAC92] 19-B * 00 20 31.01 +59 19 05.2     24.0     ~ 1 0
37 LGGS J002031.05+591904.2 mul 00 20 31.05 +59 19 04.2   22.94 22.60 22.04 21.70 WN? 7 0
38 LGGS J002032.80+591716.4 WR* 00 20 32.79 +59 17 16.4   22.82 21.38 20.09 18.67 WN7 9 0
39 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
40 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
41 NAME Local Group GrG ~ ~           ~ 6697 0

    Equat.    Gal    SGal    Ecl

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2019.12.08-14:51:22

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