A period analysis of the optical line variability of β Cephei: evidence for multi-mode pulsation and rotational modulation.

Details A period analysis of the optical line variability of β Cephei: evidence for multi-mode pulsation and rotational modulation. A period analysis of the optical line variability of β Cephei: evidence for multi-mode pulsation and rotational modulation.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..493t&link_type=abstract

Astronomy and Astrophysics, v.322, p.493-506

Astronomy and Astrophysics

Astrophysics

45

Line: Profiles, Stars: Early-Type, Oscillations, Rotation, Stars: Individual: Beta Cep

Scientific paper

We investigate the optical line-profile variability of the prototype of the β Cephei stars. From more than 600 spectra, with a typical signal to noise ratio of over 200 and high spectral resolution, we deduce that the variations show periodicity with at least five different frequencies. We find variability at the previously known frequencies f_1_=5.25cycles/day (radial pulsation) and f_2_=5.38c/d and f_3_=4.92c/d. Additionally, we report two new frequencies f_4_=5.08c/d and f_5_=5.42c/d. These five frequencies are present in periodograms of the velocity moments of all of the absorption lines considered (SiIII λ 4552, 4567, 4574 and OII λ 4591), and also in periodograms of the intensity variations in these lines. The variations at frequencies f_1_ and f_2_ can be successfully modelled by a radial and a non-radial (l=2 or l=1, m=1) pulsation, respectively. Following results of studies of the UV resonance lines of β Cep, we interpret the frequency spacings f_1_-f_3_=~0.33c/d, f_1_-f_4_=~0.17c/d, f_5_-f_1_=~0.17c/d as multiples of the rotation frequency of the star. We discuss the influence of the presence of a (surface) magnetic field on the apparent modulation of the line-profile variability of the radial pulsation mode.

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