Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-23
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics. This submission does not include Figure 1 (lightcurves & power spectra).
Scientific paper
10.1051/0004-6361:20077084
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.
Christian Damian Joseph
Collier Cameron Andrew
Enoch B.
Gallaway M.
Haswell Carole A.
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