A new bright beta Cephei star: line-profile variability in omega^1 SCO

Details A new bright beta Cephei star: line-profile variability in omega^1 SCO A new bright beta Cephei star: line-profile variability in omega^1 SCO

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..150t&link_type=abstract

Astronomy and Astrophysics, v.339, p.150-158 (1998)

Other

16

Line: Profiles, Stars: Early-Type, Stars: Oscillations, Stars: Rotation, Stars: Variables: Other, Stars: Individual: Omega (1) Sco

Scientific paper

We present a time series of high-resolution spectra, showing the line-profile variations in the Siiii triplet (lambda 4552, 4567, 4574 Angstroms) of the rotating early-type star omega (1) Sco. The profile variations can be explained by a non-radial pulsation mode. We analyse the spectral time series by making Fourier transforms for each position in the line profile. Significant power is found only at a frequency of 15.0 cycles/day, suggesting that the profile variations are due to one dominant pulsation mode. From the difference in phase of the variations of the blue and the red wings of the profiles we infer that the star pulsates in a mode with pulsational degree l=9+/-1. From comparison with model calculations we estimate the velocity amplitude of this pulsation to be ga 10 km/s at the stellar surface.

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