Radial and Nonradial Oscillations of 63 Her (HD155514 = HR6391)


Abstract: 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 \mu Hz, which is classified as a second harmonic radial oscillation, and five of the observed nonradial modes were obtained at the harmonic degree l=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.

Keywords: Stars: 63 Her, pulsations, evolution

Full Text: PDF