New periodic variable stars coincident with ROSAT sources discovered using SuperWASP

A. J. Norton, P. J. Wheatley, R. G. West, C. A. Haswell, R. A. Street, Andrew Collier Cameron, D. J. Christian, W. I. Clarkson, B. Enoch, M. Gallaway, C. Hellier, Keith Douglas Horne, J. Irwin, S. R. Kane, T. A. Lister, J. P. Nicholas, N. Parley, D. Pollacco, R. Ryans, I. SkillenD. M. Wilson

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

We present optical lightcurves of 428 periodic variable stars coincident with ROSAT X-ray sources, detected using the first run of the SuperWASP photometric survey. Only 68 of these were previously recognised as periodic variables. A further 30 of these objects are previously known pre-main sequence stars, for which we detect a modulation period for the first time. Amongst the newly identified periodic variables, many appear to be close eclipsing binaries, their X-ray emission is presumably the result of RS CVn type behaviour. Others are probably BY Dra stars, pre-main sequence stars and other rapid rotators displaying enhanced coronal activity. A number of previously catalogued pulsating variables (RR Lyr stars and Cepheids) coincident with X-ray sources are also seen, but we show that these are likely to be misclassifications. We identify four objects which are probable low mass eclipsing binary stars, based on their very red colour and light curve morphology.
Original languageEnglish
Pages (from-to)785-905
JournalAstronomy & Astrophysics
Volume467
Issue number2
DOIs
Publication statusPublished - May 2007

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