Volume 414, Number 3, February II 2004
|Page(s)||L45 - L48|
|Published online||27 January 2004|
Letter to the Editor
On the Wolf-Rayet counterpart to IC 10 X-1
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2 Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK
Corresponding author: J. S. Clark, email@example.com
Accepted: 19 December 2003
Recent Chandra observations of the starburst galaxy IC 10 have resulted in an improved position for the bright (>1038 erg s-1) X-ray source IC 10 X-1. We discuss arguments in favour of the Wolf-Rayet star #17-A from Massey et al. and Crowther et al. being the optical counterpart; alternative possibilities are also considered. We discuss the properties of Massey et al. 17-A, finding it to be amongst the most luminous – and hence massive – WNE stars known and make comparisons with Cyg X-3. Finally we examine evolutionary constraints relating to the nature of the compact companion, finding that a putative neutron star companion would place stringent constraints on the minimum progenitor mass required to form a black hole in close binaries.
Key words: galaxies: individual: IC 10 / stars: Wolf Rayet / X-rays: binaries
© ESO, 2004
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