I. M. Brandão, H. Bruntt, M. S. Cunha, D. W. Kurtz
We present new constraints on the rapidly oscillating Ap star alpha Cir, derived from a combination of interferometric and photometric data obtained with the Sydney University Stellar Interferometer (SUSI) and the WIRE satellite. The highlights of our study are:
- the determination, for the first time, of the angular diameter of a rapidly oscillating Ap star;
- an independent determination of the effective temperature of alpha Cir, which is found to be lower than the values previously estimated;
- two additional oscillation frequencies, which provide a new determination of the large separation of the star.
XVIII Encontro Nacional de Astronomia e Astrofísica