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Title: New periodic variable stars coincident with ROSAT sources discovered using SuperWASP
Authors: Norton, A. J.
Haswell, C. A.
Enoch, B.
Gallaway, M.
Wheatley, P. J.
Nicholas, J. P.
West, R. G.
Street, R. A.
Christian, D. J.
Pollacco, D.
Ryans, R.
Collier Cameron A
Horne, K.
Clarkson, W. I.
Hellier, C.
Lister, T. A.
Wilson, D. M.
Irwin, J.
Kane, S. R.
Parley, N.
Skillen, I.
First Published: May-2007
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2007, 467 (2), pp. 785-905
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.
DOI Link: 10.1051/0004-6361:20077084
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2007 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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