Radial and nonradial oscillations of 63 Her (HD155514=HR6391)

Özet

An attempt has been made toward explaining the observed frequencies in 63 Her. A sequence of evolutionary models have been calculated up to a point where stellar parameters match the observed luminosity and effective temperature of 63 Her. Radial and nonradial oscillations frequencies were obtained for a series of masses 1.85, 1.90 and 1.95 $M_\odot$ and eigth models which represent best the pulsations of 63 Her are given in this paper. Calculations are restricted to low harmonic degrees ( l= 0,1,2,3 ). Six of the eigth observed frequencies quoted in literature were obtained. These we obtained for the model of mass 1.90 $M_\odot$. The observationally measured frequency 220.7 m Hz, which is classified as a second harmonic radial oscillation, and five of the observed nonradial modes were obtained at the harmonic degree 1=3. The difference between the observed and calculated frequencies are $(\nu_{n/l,c} - \nu_{obs})$ = 0.3, 0.8, 0.7, 0.2, and 0.7 $\mu$ Hz with n/l= -15/3, -12/3, -9/3, -7/3, -3/3, respectively.