Periodically Variable B-type Supergiants: Empirical Evidence for Non-Radial Gravity-Mode Oscillations

Details Periodically Variable B-type Supergiants: Empirical Evidence for Non-Radial Gravity-Mode Oscillations Periodically Variable B-type Supergiants: Empirical Evidence for Non-Radial Gravity-Mode Oscillations

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..388..193l&link_type=abstract

Mass Loss from Stars and the Evolution of Stellar Clusters ASP Conference Series, Vol. 388, proceedings of the conference held 2

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We studied a sample of 28 periodically variable B supergiants discovered from HIPPARCOS. Our goal was to investigate a possible correlation between mass-loss and photometric variability in supergiants. We analyzed high resolution spectra of the sample stars gathered during several years, using the NLTE atmosphere code FASTWIND. The obtained fundamental parameters strongly suggest that the periodic variability is caused by non-radial gravity modes. We find only marginal evidence that the mass loss depends on the oscillation amplitude.

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