EDP Sciences
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Volume 370, Number 2, May I 2001
Page(s) 496 - 502
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010237

A&A 370, 496-502 (2001)
DOI: 10.1051/0004-6361:20010237

The radial pulsation of AI Aurigae

L. L. Kiss1 and B. A. Skiff2

1  Department of Experimental Physics and Astronomical Observatory, University of Szeged, Dóm tér 9., 6720 Szeged, Hungary
2  Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA

(Received 14 November 2000 / Accepted 12 February 2001 )

We present an analysis of eleven years of Strömgren by photometry of the red semiregular variable star AI Aurigae. An early period determination of 63.9 days is confirmed by the long-term light curve behaviour. The light curve shows semi-regular changes with a mean period of 65 days reaching an amplitude of 0 fraction of minute6 in some cycles. The b-y colour changes perfectly parallel the V light curve, suggesting radial oscillation to be the main reason for the observed variations. We estimate the main characteristics of the star (mass, radius, effective temperature) that suggest radial pulsation in fundamental or first overtone mode.

Key words: stars: pulsation -- stars: AGB -- stars: individual: AI Aur

Offprint request: L. L. Kiss, l.kiss@physx.u-szeged.hu

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