Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...394..603s&link_type=abstract
Astronomy and Astrophysics, v.394, p.603-615 (2002)
Astronomy and Astrophysics
Astrophysics
16
Line: Profiles, Stars: Early-Type, Oscillations, Rotation, Stars: Variables: Beta Cephei Stars, Stars: Individual: Nu Cen
Scientific paper
We present time series of high-resolution spectra of the beta Cephei star nu Cen, showing multi-periodic variations in the SiIII lambda 4552 and lambda 4567 line profiles. After correction for the binary motion, we analyse the time series of spectra by Fourier transforms for each position in the line profile. For selected frequencies we perform a direct fit of multiple sinusoids. Four frequencies are needed to describe the pattern of moving bumps in the line profiles. We present the distributions of variational amplitude and phase across the line profile and use these diagnostics to show that most of the variability can be explained by multiple non-radial pulsations. From the phase distributions across the line profiles we derive estimates for the degree l of the individual pulsation modes in nu Cen. We find l values ranging from 6 to 10. We find no trace of a previously reported low-degree l <~ 2 pulsation with a period of 0.17 day. We briefly discuss these observations, and those of the other close-binary beta Cephei stars alpha Vir and psi 2 Ori, in terms of tidal effects on pulsation-mode stability. Based on data taken at ESO La Silla.
Schrijvers Coen
Telting John H.
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