New periodic variable stars coincident with ROSAT sources discovered using SuperWASP

Scopus Pub Date : 2007-02-23 DOI:10.1051/0004-6361:20077084

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

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引用次数: 70

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.

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新的周期变星与使用超级黄蜂发现的ROSAT源一致

我们展示了428颗周期变星的光学光曲线，这些恒星与ROSAT x射线源一致，使用第一次SuperWASP光度调查检测到。其中只有68个以前被认为是周期变量。另外30个天体是以前已知的主序前恒星，我们第一次探测到它们的调制周期。在新发现的周期变量中，许多似乎是近食双星，它们的x射线发射可能是RS CVn型行为的结果。其他可能是BY Dra星，主序前星和其他快速旋转星，显示出增强的日冕活动。许多先前编目的脉动变星(RR Lyr星和造父变星)也与x射线源一致，但我们表明这些可能是错误的分类。根据它们非常红的颜色和光曲线形态，我们确定了四个可能是低质量食双星的物体。

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