Photometric Periodicities of Be/X-ray Pulsars in the Small Magellanic Cloud

Details Photometric Periodicities of Be/X-ray Pulsars in the Small Magellanic Cloud Photometric Periodicities of Be/X-ray Pulsars in the Small Magellanic Cloud

2005-06-29

arxiv.org/abs/astro-ph/0506728v1

Astron.J.130:2220-2229,2005; Astron.J.132:919-925,2006

Astronomy and Astrophysics

Astrophysics

27 pages, 15 figures

Scientific paper

10.1086/491705 10.1086/505752

Analysis of the longterm photometric variability of 7 Be/X-ray-pulsar systems in the Small Magellanic Cloud has been carried out. We find a variety of types of variability are present, including: longterm irregular changes, periodic orbital outbursts due to interaction between the stars (weeks to months), low-amplitude quasi-periodic variations of the equatorial disk (days), and nonradial pulsations of the Be primary star (hours). This is the first time nonradial pulsations have been identified in Be/X-ray binaries, although they were previously known in some single Be stars.

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