Journal Article

Light curve morphology study of UW CrB – evidence for a 5 d superorbital period

Pasi Hakala, Linnea Hjalmarsdotter, Diana C. Hannikainen and Panu Muhli

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 2, pages 892-899
Published in print April 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14374.x
Light curve morphology study of UW CrB – evidence for a 5 d superorbital period

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Since its discovery in 1990, UW CrB (also known as MS1603+2600) has remained a peculiar source without firm classification. Our current understanding is that it is an accretion disc corona (ADC) low-mass X-ray binary. In this paper, we present results from our photometric campaign dedicated to studying the changing morphology of the optical light curves. We find that the optical light curves show remarkable evidence for strongly evolving light curve shapes. In addition, we find that these changes show a modulation at a period of ∼5 d. We interpret these changes as either due to strong periodic accretion disc warping or due to other geometrical changes because of disc precession at a period of 5 d. Finally, we have detected 11 new optical bursts, the phase distribution of which supports the idea of a vertically extended asymmetric accretion disc.

Keywords: accretion, accretion discs; binaries: close

Journal Article.  4586 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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