منابع مشابه
The Wolf - Rayet counterpart of CygnusX - 3 ⋆
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 ...
متن کاملChandra and Hst Confirmation of the Luminous and Variable X-ray Source Ic 10 X-1 as a Possible Wolf-rayet, Black-hole Binary
We present a Chandra and HST study of IC 10 X-1, the most luminous X-ray binary in the closest starburst galaxy to the Milky Way. Our new hard X-ray observation of X-1 confirms that it has an average 0.5–10 keV luminosity of 1.5× 1038 erg s−1, is strongly variable (a factor of ≈2 in .3 ks), and is spatially coincident (within 0.23±0.30) with the Wolf-Rayet (WR) star [MAC92] 17A in IC 10. The sp...
متن کاملOn the massive star content of the nearby dwarf irregular Wolf - Rayet galaxy IC 4662
Aims. We investigate the massive stellar content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662, and consider its global star forming properties in the context of other metal-poor galaxies, the SMC, IC 10 and NGC 1569. Methods. Very Large Telescope/FORS2 imaging and spectroscopy plus archival Hubble Space Telescope/ACS imaging datasets permit us to spatially identify the location, numb...
متن کاملSs 433: the Second Wolf-rayet X-ray Binary ?
We present mid-infrared spectrophotometric observations of SS 433 with ISOPHOT. The HeI+HeII lines in both spectra of SS 433 and of the Wolf-Rayet star WR147, a wind-colliding WN8+BO5 binary system, closely match. The 2.5-12 μm continuum radiation is due to an expanding wind free-free emission in an intermediate case between optically thick and optically thin regimes. The inferred mass loss rat...
متن کاملOptical Counterpart of the Ultraluminous X-ray Source Ic 342 X-1
We present Chandra and HST observations of the ultraluminous X-ray source (ULX) IC 342 X-1. The Chandra and HST images are aligned using two X-ray emitting foreground stars. The astrometry corrected position for X-1 is R.A. = 03 h 45 m 55. s 61, Decl. = +68 • 04 ′ 55. ′′ 3 (J2000) with an error circle of 0.2 ′′. One extended optical source is found in the error circle, which could be the optica...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031762