2003A&A...402..755O


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET08:34:02

2003A&A...402..755O - Astronomy and Astrophysics, volume 402, 755-765 (2003/5-1)

The conspicuous absence of X-ray emission from carbon-enriched Wolf-Rayet stars.

OSKINOVA L.M., IGNACE R., HAMANN W.-R., POLLOCK A.M.T. and BROWN J.C.

Abstract (from CDS):

The carbon-rich WC5star WR114 was not detected during a 15.9 ksec XMM-Newton observation, implying an upper limit to the X-ray luminosity of LX≲2.5x1030erg/s and to the X-ray to bolometric luminosity ratio of LX/Lbol≲4x10–9. This confirms indications from earlier less sensitive measurements that there has been no convincing X-ray detection of any single WC star. This lack of detections is reinforced by XMM-Newton and Chandra observations of WC stars. Thus the conclusion has to be drawn that the stars with radiatively-driven stellar winds of this particular class are insignificant X-ray sources. We attribute this to photoelectronic absorption by the stellar wind. The high opacity of the metal-rich and dense winds from WC stars puts the radius of optical depth unity at hundreds or thousands of stellar radii for much of the X-ray band. We believe that the essential absence of hot plasma so far out in the wind exacerbated by the large distances and correspondingly high ISM column densities makes the WC stars too faint to be detectable with current technology. The result also applies to many WC stars in binary systems, of which only about 20% are identified X-ray sources, presumably due to colliding winds.

Abstract Copyright:

Journal keyword(s): stars: individual: WR 114 (HD 196010) - stars: winds, outflows - stars: early-type - X-rays: stars

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 4004 WR* 00 43 28.3971235391 +64 45 35.383738645 10.28 10.718 10.138     WN4-s 184 0
2 HD 17638 WR* 02 52 11.6616623898 +56 56 07.129636750 10.99 10.86 10.41     WC6 112 0
3 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 748 0
4 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 853 0
5 HD 88500 WR* 10 10 31.9111494342 -60 38 42.417239257   10.84 10.65 10.67   WC5 79 0
6 HD 92809 WR* 10 41 38.3243559450 -58 46 18.721755258 8.95 9.28 9.03 9.60   WC6 143 0
7 * tet Mus WR* 13 08 07.1527888825 -65 18 21.679641155 4.71 5.50 5.53 5.44 5.40 WC5+B0III 298 0
8 HD 115473 WR* 13 18 27.9938060343 -58 08 13.603603690 9.09 9.68 9.00 9.72   WC5 106 0
9 HD 119078 WR* 13 43 16.3585170935 -67 24 04.971391283 9.11 9.737 9.40 10.08   WC7/8 99 0
10 HD 121194 WR* 13 55 48.4480921364 -61 09 48.458279758 14.34 13.65 12.20 12.12 10.31 WC8 38 0
11 WRAY 15-1297 WR* 15 13 41.7098852670 -59 11 44.971320833 16.25 15.58 13.65 13.11   WC9d+OB? 58 0
12 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 802 1
13 HD 152270 WR* 16 54 19.6991728950 -41 49 11.535393651 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 287 0
14 HD 156385 WR* 17 19 29.9012727857 -45 38 23.874796927 6.55 6.97 6.92 8.11   WC7 157 0
15 HD 157504 WR* 17 25 08.8534998754 -34 11 12.502902170 12.80 12.10 10.68 10.39 11.546 WC7+O7-9 111 0
16 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 920 0
17 [BSD96] 22 WR* 17 45 39.38 -29 00 33.4           WC8/9 27 0
18 WR 102a WR* 17 45 48.57 -28 50 05.7           WN8 12 0
19 HD 313643 WR* 18 04 43.6647304100 -21 09 30.557213987 13.58 13.27 12.02 11.67   WC9d 89 0
20 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 147 0
21 HD 165763 WR* 18 08 28.4691215895 -21 15 11.182287576 7.16 7.54 7.82 8.55   WC6 271 0
22 XMMU J182258.1-135324 X 18 22 58.1 -13 53 24           ~ 1 0
23 XMMU J182304.3-135038 X 18 23 04.3 -13 50 38           ~ 1 0
24 HD 169010 WR* 18 23 16.3425134513 -13 43 26.103469647 13.53 12.99 12.02 11.95   WC 75 0
25 XMMU J182319.8-134011 X 18 23 19.8 -13 40 11           ~ 2 0
26 XMMU J182321.2-134645 X 18 23 21.2 -13 46 45           ~ 1 0
27 PSR B1820-13.8 Psr 18 23 24.25 -13 47 54.0           ~ 5 0
28 XMMU J182342.8-134949 X 18 23 42.8 -13 49 49           ~ 1 0
29 RAFGL 2179 WR* 18 31 42.2117071870 -09 59 16.687501795   25.0 22.0     WC9 86 0
30 EM* AS 320 WR* 18 44 13.1527220304 -03 47 57.779718279 13.7 13.340 13.983     WC9d 114 0
31 MR 93 WR* 19 28 15.6144084163 +19 33 21.527872339   14.83       WC7+O9(III) 101 0
32 HD 192103 WR* 20 11 53.5274946554 +36 11 50.523501826 7.77 8.13 8.11     WC8+OB: 324 0
33 HD 192641 WR* 20 14 31.7667382048 +36 39 39.597237795 7.80 8.20 7.91     WC7pd+O9V 313 0
34 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 657 1
35 MR 110 WR* 20 32 03.0200838781 +41 15 20.497485753   15.99 13.97     WC5 75 0
36 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1798 2
37 HD 213049 WR* 22 27 17.8189297929 +56 15 11.768608852   11.71 10.99     WC6 82 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-08:34:02

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