Observational evidence for global oscillations in Be star disks

Details Observational evidence for global oscillations in Be star disks Observational evidence for global oscillations in Be star disks

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.216...99h&link_type=abstract

Astrophysics and Space Science, vol. 216, no. 1-2, p. 99-103

Astronomy and Astrophysics

Astrophysics

5

B Stars, Emission Spectra, H Alpha Line, H Beta Line, Kepler Laws, Stellar Envelopes, Stellar Models, Stellar Oscillations, Stellar Spectra, Astronomical Spectroscopy, Iron, Spectrographs

Scientific paper

From a long-term spectroscopic observing campaign of Be stars we have found that their emission line profiles separate into two classes, the second of which is very asymmetric. The sign of asymmetry changes on a timescale of a few years. We show that these line profiles and the well-known enigmatic V/R variations observed in some Be stars are two aspects of the same phenomenon, one-armed global oscillations in a Keplerian disk. We present model profiles and a line fit to support this hypothesis and find good overall agreement.

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