Multiband photometric re-classification of ROTSE-I delta Scuti type stars

Astronomy and Astrophysics – Astrophysics

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Stars: Variables: Delta Sct, Stars: Binaries: Eclipsing, Techniques: Photometric

Scientific paper

We present multi-passband CCD photometry of 20 ROTSE-I delta Scuti type pulsating stars and 1 RR Lyrae star to re-classify their variable types using the comparison of amplitudes between V and I passbands. For the re-classification, we used a criterion that pulsating stars have larger amplitude differences between passbands than eclipsing binaries because brightness changes of pulsating stars are mainly due to the temperature variations. As a result, only six stars were re-confirmed as delta Scuti variables and thirteen stars turned out to be W UMa type eclipsing binaries. The other two stars were identified as one cataclysmic variable and one non-variable, respectively. Our results suggest that a number of ROTSE-I delta Scuti type stars, which do not show typical pulsating light curves of high amplitude delta Scuti stars, are W UMa type eclipsing binaries.
Table 3 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/404/621

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