The radial pulsation of AI Aurigae

Details The radial pulsation of AI Aurigae The radial pulsation of AI Aurigae

2001-02-13

arxiv.org/abs/astro-ph/0102231v1

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20010237

We present an analysis of eleven years of Stromgren 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 0.6 mag 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.

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