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X-ray selected Wolf-Rayet stars: The discovery of Th35-42 and prospects for future X-ray surveys

Published online by Cambridge University Press:  07 August 2017

S. Mereghetti ,
T. Belloni ,
F. Haberl  and
W. Voges
S. Mereghetti
Affiliation:
Istituto di Fisica Cosmica, Milano, Italy
T. Belloni
Affiliation:
Astronomical Institute Anton Pannekoek, Amsterdam, The Netherlands
F. Haberl
Affiliation:
Max-Planck-Institut, Garching bei München, B.R. Deutschland
W. Voges
Affiliation:
Max-Planck-Institut, Garching bei München, B.R. Deutschland

Abstract

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The X-ray source 1E 1024.0-5732, serendipitously discovered with the Einstein Observatory, was previously interpreted as a rapidly spinning neutron star, accreting matter from its massive early-type companion, the emission-line star Th35-42. However, new ROSAT data do not support the presence of a neutron star in this source. A more likely scenario, also indicated by recent optical spectroscopy, involves X-ray emission from the colliding winds of a WR+O binary. Surprisingly, this star remained unnoticed during an extensive optical search for new Wolf-Rayet stars, carried out in this region of sky. Stimulated by the discovery of this first X-ray selected WR star, we have undertaken a search for similar objects in the data from the ROSAT All Sky Survey.

Keywords

stars: Wolf-RayetX-raysbinariescolliding winds
Type
Session VII - Hydrodynamics and high-energy physics of colliding winds
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 481 - 485
Copyright
Copyright © Kluwer 1995 

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