2007A&A...469L..31C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.09CET22:43:40

2007A&A...469L..31C - Astronomy and Astrophysics, volume 469, L31-34 (2007/7-1)

On the optical counterpart of NGC 300 X-1 and the global Wolf-Rayet content of NGC 300.

CROWTHER P.A., CARPANO S., HADFIELD L.J. and POLLOCK A.M.T.

Abstract (from CDS):

Surveys of Wolf-Rayet (WR) populations in nearby galaxies provide tests of evolutionary models plus type Ib/c supernova progenitors. This spectroscopic study complements the recent imaging survey of the spiral galaxy NGC 300 by Schild et al. (2003A&A...397..859S). Revisions to the known WR content of NGC 300 are presented. We investigate the WR nature of candidate #41 from Schild et al. (2003A&A...397..859S) which is spatially coincident with the bright X-ray point source NGC 300 X-1. VLT/FORS2 multi-object spectroscopy of WR candidates in NGC 300 is obtained. We establish an early-type WN nature of #41, i.e. similar to the optical counterpart of IC 10 X-1, which closely resembles NGC 300 X-1. We confirm 9 new WR stars, bringing the current WR census of the inner disk to 31, with N(WC)/N(WN) ∼0.9. If #41 is the optical counterpart for NGC 300 X-1, we estimate a WR mass of 38M based upon ground-based photometry, from which a black hole mass of ≥10M results from the 32.8 h period of the system and WR wind velocity of 1250km/s. We estimate an 95% completeness among WC stars and 70% among WN stars, such that the total WR content is ∼40, with N(WC)/N(WN)∼0.7. From the Hα-derived star formation rate of the inner galaxy, we infer N(WR)/N(O)∼0.04.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 300 - stars: Wolf-Rayet - X-rays: binaries - X-rays: individuals: NGC 300 X-1

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 - 2020
#notes
1 [MAC92] 17-A WR* 00 20 29.05 +59 16 52.3     22.5     WNE 14 0
2 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 147 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10608 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9134 1
5 [SCA2003] 3 WR* 00 54 42.61 -37 40 28.5           WNE 2 0
6 [SCA2003] 5 WR* 00 54 43.53 -37 39 49.9           WCe 2 0
7 [SCA2003] 8 WR* 00 54 45.28 -37 38 47.0           WNL 3 0
8 [BAT97] I 2 WR* 00 54 50.2 -37 38 23   21.4       WNE 4 0
9 2MASS J00545263-3741486 * 00 54 52.6387611008 -37 41 48.690213083     17.57     ~ 2 0
10 [SCA2003] 23 WR* 00 54 53.11 -37 43 47.3     19.71     ~ 2 0
11 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1272 2
12 [SCA2003] 27 WR* 00 54 55.99 -37 40 17.6     20.47     ~ 2 0
13 [SCA2003] 31 WR* 00 55 00.65 -37 38 51.5     22.14     WNE 2 0
14 [BAT97] II 1 WR* 00 55 02.7 -37 43 12   22.0       WCe 3 0
15 NAME NGC 300 X-1 HXB 00 55 09.990 -37 42 12.16     22.44     WNE 100 1
16 [SCA2003] 42 WR* 00 55 11.03 -37 37 55.5     22.39     WNL 2 0
17 [SCA2003] 52 WR* 00 55 13.18 -37 38 01.4     22.74     WCe 2 0
18 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5034 1
19 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 588 2
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14380 1
21 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2168 2

    Equat.    Gal    SGal    Ecl

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2019.12.09-22:43:40

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