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Optical Counterparts to Be/X-ray Binaries in the Magellanic Clouds

Published online by Cambridge University Press:  25 May 2016

David A. H. Buckley ,
James B. Stevens  and
Malcolm J. Coe
David A. H. Buckley
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
James B. Stevens
Affiliation:
Dept. of Physics & Astronomy, University of Southampton, Southampton SO 17 1BJ, UK
Malcolm J. Coe
Affiliation:
Dept. of Physics & Astronomy, University of Southampton, Southampton SO 17 1BJ, UK

Abstract

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We discuss the optical identification of 9 Be/X-ray binary optical counterparts of X-ray sources in the Magellanic clouds, most of them discovered in ROSAT observations. Imaging CCD photometry (using BV RC and Hα filters) was employed to search the typically 20 arcsec radius error circles for early-type stars exhibiting Hα emission. Spectroscopy of 5 candidates confirmed the presence of Hα emission. Based on the positional coincidences, we propose Be star optical counterparts to all of 9 X-ray sources: 6 from ROSAT and one each from ASCA, EXOSAT and HEAO-1. All of the sources exhibit the typical X-ray characteristics of Be/neutron star X-ray binaries: transient nature or strong variability, relatively hard X-ray spectra and, in 5 cases, detections of probable neutron star spin periods in the range 8.9 to 91.1 seconds.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 112 - 115
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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