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Astron. Astrophys. 324, 959-964

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AN Lyn: an unusual medium amplitude Sct star

E. Rodríguez1, S.F. González-Bedolla2,*, A. Rolland1, V. Costa1, and P. López de Coca1

1Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, E-18080 Granada, Spain
2Instituto de Astronomía, UNAM, Apartado 70-264, CP-4510 México D.F., Mexico

Received 14 October 1996 / Accepted 24 February 1997


Simultaneous uvby FORMULA photometric observations of the medium amplitude FORMULA Sct star AN Lyn have been collected and new times of light maxima have been obtained. The Fourier transform and classical O-C methods are used to analyse the pulsation of this star. The light curves are peculiar in the sense that the descending branches are steeper than the ascending ones. Amplitude variations are shown to be present from season to season. The analysis of the phase shifts between observed light and colour variations suggests that this star is a radial pulsator. In addition, intrinsic b-y, m1 and c1 values are also derived and the physical parameters are determined indicating that this variable is a nearly cold and evolved FORMULA Sct star showing solar metal abundances and pulsating in the second overtone.

Key words: stars: variables: FORMULA Scu - stars: individual: AN Lyn - stars: oscillations - techniques: photometric

Send offprint requests to: E. Rodríguez (eloy@iaa.es) *Deceased

© European Southern Observatory (ESO) 1997