Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..73..159a&link_type=abstract
Astrophysics and Space Science, vol. 73, no. 1, Nov. 1980, p. 159-174.
Astronomy and Astrophysics
Astrophysics
1
Angular Velocity, Stellar Interiors, Stellar Oscillations, Stellar Rotation, B Stars, Early Stars, Stellar Mass, Stellar Models, Variable Stars
Scientific paper
Some physical aspects of the effect of rotation on the nonradial oscillations are discussed by the perturbation method. A new method to estimate the inner rotational angular velocity in stars with use of the rotational frequency splitting of the nonradial oscillations is proposed, and the 'effective depth' for a specified mode is defined for practical procedure. The necessary quantities (frequencies, 'effective depths' and Ck,l values) to derive the inner rotational angular velocity through the observations by this method are calculated for models of several early type stars with masses ranging from 1.5 to 20 solar masses. The method is applied to three stars; B-type variable star, 53 Per, beta Cep star, 12 Lac and delta Sct star, 1 Mon for which good observations are available. It is shown that the rotational angular velocities obtained seem reasonable. However, whether or not the differential rotation in the stars is actually real cannot be confirmed in this paper because of the difficulty of getting exact information about the stellar mass and evolutionary stage.
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