منابع مشابه
XMM - Newton X - ray Observations of the Wolf - Rayet Binary System WR 147
We present results of a ≈20 ksec X-ray observation of the Wolf-Rayet (WR) binary system WR 147 obtained with XMM-Newton. Previous studies have shown that this system consists of a nitrogen-type WN8 star plus an OB companion whose winds are interacting to produce a colliding wind shock. X-ray spectra from the pn and MOS detectors confirm the high extinction reported from IR studies and reveal ho...
متن کاملLong - term photometry of the Wolf - Rayet stars WR 137 , WR 140 , WR 148 , and WR 153 ⋆
In 1991, a long term UBV -photometry campaign of four Wolf-Rayet stars was started using the 60 cm telescope of the National Astronomical Observatory Rozhen, Bulgaria. Here we report on our observational results and discuss the light variations. The star WR137 was observed during 1991 1998. No indications of eclipses were found, though random light variations with small amplitudes exist, which ...
متن کاملWR 20a is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
We present a high-precision I-band light curve for the Wolf-Rayet binary WR 20a, obtained as a sub-project of the Optical Gravitational Lensing Experiment. Rauw et al. have recently presented spectroscopy for this system, strongly suggesting extremely large minimum masses of 70.7± 4.0 M⊙ and 68.8± 3.8 M⊙ for the component stars of the system, with the exact values depending strongly on the peri...
متن کاملDiscovery of Extremely Large-amplitude Quasi-periodic Photo- Metric Variability in Wc9-type Wolf- Rayet Binary, Wr 104
We discovered that the Wolf-Rayet (WR)+OB star binary, WR 104, renowned for its associated “dusty pinwheel nebula” recently spatially resolved with infrared interferometry, exhibits strong quasi-periodic optical variations with a full amplitude of 2.7 mag. Such a large-amplitude, continuous variation has been unprecedented in a WR star. The optical quasi-period (∼241 d) is in almost perfect agr...
متن کاملA bipolar outflow in the M 1 - 67 nebula around the Wolf - Rayet star WR 124 ?
Ground based high resolution coronographic images of the inner M 1-67 nebula (' 40′′ × 60′′) around the Wolf Rayet WR 124 have been obtained with the Johns Hopkins Adaptive Optic Coronograph at the Swope 40′′ telescope, Las Campanas, in the light of Hα + [NII]. The inner M 1-67 nebula appears very clumpy and remarkably axisymmetric. In addition, we present new high signal-to-noise long slit spe...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2006
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2005.09693.x