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Issue A&A Volume 411, Number 3, December I 2003 Page(s) 503 - 507 Section Stellar atmospheres DOI 10.1051/0004-6361:20031485

A&A 411, 503-507 (2003)
DOI: 10.1051/0004-6361:20031485

Modelling the oscillating star V1162 Ori

R. Civelek, N. Kiziloglu and H. Kirbiyik

Department of Physics, Middle East Technical University, Inönü Bulvari, 06531 Ankara, Turkey
(Received 12 May 2003 / Accepted 12 August 2003)

Abstract
Evolutionary stellar models of V1162 Ori, with the latest observations of a multiperiodic Scuti star, have been calculated theoretically and compared with the observations. Theoretical models representative of the star indicate that it is at an advanced stage of its main-sequence evolution. Calculations have been made for two different masses, 1.80 and 1.82  , at different rotational speeds. Rotation was treated as a perturbation and only the first-order effect was considered. The evolutionary models were used to obtain the radial and non-radial adiabatic oscillation frequencies and the oscillation equations were treated linearly. The radial fundamental frequency (12.7082 d ^-1) named so by the observers and the other observed frequencies were theoretically found from the model (model 4) that is claimed to represent the observed star the best. The agreement with the observations is within a few hundredths of a cycle or better. Since an observational rotational value of  km s ^-1 is published in the literature, rotational effects on the oscillation modes were also considered. It is shown that the oscillation frequencies increase with rotational speed for rotational velocities larger than about 50 km s ^-1.

Key words: stars: oscillations -- stars: variables: Scuti -- stars: individual: V1162 Ori

Offprint request: R. Civelek, rikkat@photon.physics.metu.edu.tr

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