Mode identification with the moment method in four multiperiodic β Cephei stars: KK Velorum, ν Eri, β CMa, and V348 Normae

Details Mode identification with the moment method in four multiperiodic β Cephei stars: KK Velorum, ν Eri, β CMa, and V348 Normae Mode identification with the moment method in four multiperiodic β Cephei stars: KK Velorum, ν Eri, β CMa, and V348 Normae

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..136a&link_type=abstract

Astronomy and Astrophysics 286, 136-148 (1994)

Astronomy and Astrophysics

Astrophysics

21

Line: Profiles, Stars: Early-Type, Stars: Oscillations, Stars: Individual: Kk Vel, {Nu} Eri, {Beta} Cma, V348 Nor

Scientific paper

We present analyses of line profile variations obtained for four multiperiodic β Cephei stars: KK Velorum, ν Eri, β CMa, and V348 Normae. An identification of the modes has been attempted by means of the moment method. This quantitative identification technique was first proposed by Balona (1986) and was later refined by Aerts et al. (1992) in case of a monoperiodic pulsation in a slowly rotating star. Recently, Mathias et al. (1993) have proposed a generalisation of the moment method to multiperiodic pulsations. We apply their formalism to obtain the velocity parameters in the four mentioned stars. We have found that KK Velorum, instead of being a monoperiodic variable, pulsates in two modes of which the second one has a period that is half of the period of the already known mode. The Q-values for the two modes indicate that the main mode probably is a g-mode, while the second one definitely is a p-mode. Because we did not fully cover the overall beat-period in ν Eri and β CMa, we could treat only the most important modes present in these stars. We found it very useful for these cases to be able to combine photometric and spectroscopic results. The rapidly rotating star V348 Normae seems to pulsate in three high-degree modes with very large amplitudes, a confirmation of the result obtained from a photometric analysis presented by Waelkens & Cuypers (1985).

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