1996A&A...314..521V


Query : 1996A&A...314..521V

1996A&A...314..521V - Astronomy and Astrophysics, volume 314, 521-540 (1996/10-2)

The Wolf-Rayet counterpart of Cygnus X-3.

VAN KERKWIJK M.H., GEBALLE T.R., KING D.L., VAN DER KLIS M. and VAN PARADIJS J.

Abstract (from CDS):

We present orbital-phase resolved I and K-band spectroscopy of Cygnus X-3. All spectra show emission lines characteristic of Wolf-Rayet stars of the WN subclass. On time scales longer than about one day, the line strengths show large changes, both in flux and in equivalent width. In addition, the line ratios change, corresponding to a variation in spectral subtype of WN6/7 to WN4/5. We confirm the finding that at times when the emission lines are weak, they shift in wavelength as a function of orbital phase, with maximum blueshift coinciding with infrared and X-ray minimum, and maximum redshift half an orbit later. Furthermore, we confirm the prediction - made on the basis of previous observations - that at times when the emission lines are strong, no clear wavelength shifts are observed. We describe a simplified, but detailed model for the system, in which the companion of the X-ray source is a Wolf-Rayet star whose wind is at times ionised by the X-ray source, except for the part in the star's shadow. With this model, the observed spectral variations can be reproduced with only a small number of free parameters. We discuss and verify the ramifications of this model, and find that, in general, the observed properties can be understood. We conclude that Cyg X-3 is a Wolf-Rayet/X-ray binary.

Abstract Copyright:

Journal keyword(s): stars: individual: Cygnus X-3 - stars: Wolf-Rayet - X-rays: stars

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 17638 WR* 02 52 11.6613087600 +56 56 07.131052500 10.99 10.86 10.41     WC6 116 0
2 V* GP Vel HXB 09 02 06.8608812864 -40 33 16.899168060 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1435 0
3 HD 151932 WR* 16 52 19.2477039480 -41 51 16.270066224 6.06 6.79 6.51 7.64   WN7h 302 0
4 PSR J1915+1606 Psr 19 15 27.99999 +16 06 27.4034     22.5     ~ 954 1
5 HD 187282 WR* 19 48 32.1967360032 +18 12 03.695582124 9.60 10.49 10.51     WN4(h)-w 190 0
6 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4137 0
7 HD 191765 WR* 20 10 14.1928045152 +36 10 35.070683376 7.64 8.08 8.08     WN6-s 434 0
8 HD 193576 WR* 20 19 32.4229160448 +38 43 53.959035756 8.15 8.53 8.00     WN5+O6II-V 693 0
9 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 569 0
10 * 44 Cyg * 20 30 59.2290678096 +36 56 09.023582544 7.93 7.160 6.216 6.90 4.64 F5Ib 155 0
11 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1873 2
12 * nu. Cyg ** 20 57 10.4190684 +41 10 01.699109 3.96 3.96 3.94 3.89 3.89 A0IIIn 153 0
13 HD 211853 WR* 22 18 45.6057566664 +56 07 33.898679364 8.84 9.39 9.00     WN6o+O6I 268 0
14 HD 214419 WR* 22 36 53.9548302648 +56 54 20.989190232 8.68 9.21 8.80     WN6o+O9Ib/II 366 1

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2022.09.28-01:01:12

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