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Astron. Astrophys. 340, 196-202 (1998)

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The eclipsing binary system AB Cas: binarity and pulsation

E. Rodríguez 1, A. Claret 1, J.L. Sedano 1, J.M. García 2 and R. Garrido 1

1 Instituto de Astrofísica de Andalucía, CSIC, P.O. Box 3004, E-18080 Granada, Spain
2 Departamento de Física, E.U.I.T. Industriales, UPM, Ronda de Valencia 3, E-28012 Madrid, Spain

Received 8 June 1998 / Accepted 18 September 1998

Abstract

This paper presents uvby light curves for the Algol-type binary system AB Cas, in which the primary component is a [FORMULA] Sct-type pulsating star. Additional Crawford [FORMULA] data were also obtained. A detailed photometric analysis based on these observations is presented for both binarity and pulsation. The Wilson-Devinney code was used as the most appropriate for modelling the binary light curve whereas the pulsation of the primary component is analysed using the Fourier Transform and classical O-C methods. The pulsation analysis suggests the hotter component as monoperiodic with a period Pp=0.d05828741 oscillating in the fundamental radial mode. It is also shown that binarity, in this case, has no special effect on the pulsation.

Key words: techniques: photometric – stars: oscillations – stars: individual: AB Cas – stars: variables: ffi Sct – stars: binaries: eclipsing

Send offprint requests to: E. Rodríguez (eloy@iaa.es)
Tables 1 and 2 will be accessible only in electronic form at the CDS (http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/340/196 or ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/340/196)

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© European Southern Observatory (ESO) 1998

Online publication: November 3, 1998
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