Survey for δ Sct components in eclipsing binaries and new correlations between pulsation frequency and fundamental stellar characteristics

Abstract

CCD observations of 68 eclipsing binary systems, candidates for containing\n{\\delta} Scuti components, were obtained. Their light curves are analysed using\nthe PERIOD04 software for possible pulsational behaviour. For the systems QY\nAql, CZ Aqr, TY Cap, WY Cet, UW Cyg, HL Dra, HZ Dra, AU Lac, CL Lyn and IO UMa,\ncomplete light curves were observed due to the detection of a pulsating\ncomponent. All of them, except QY Aql and IO UMa, are analysed with modern\nastronomical softwares in order to determine their geometrical and pulsational\ncharacteristics. Spectroscopic observations of WY Cet and UW Cyg were used to\nestimate the spectral class of their primary components, while for HZ Dra\nradial velocities of its primary were measured. O - C diagram analysis was\nperformed for the cases showing peculiar orbital period variations, namely CZ\nAqr, TY Cap, WY Cet and UW Cyg, with the aim of obtaining a comprehensive\npicture of these systems. An updated catalogue of 74 close binaries including a\n{\\delta} Scuti companion is presented. Moreover, a connection between orbital\nand pulsation periods, as well as a correlation between evolutionary status and\ndominant pulsation frequency for these systems, is discussed.\n