On the spectacular variations of Be stars. Evidence for a temporarily tilted circumstellar disk

Details On the spectacular variations of Be stars. Evidence for a temporarily tilted circumstellar disk On the spectacular variations of Be stars. Evidence for a temporarily tilted circumstellar disk

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...330..243h&link_type=abstract

Astronomy and Astrophysics, v.330, p.243-252 (1998)

Astronomy and Astrophysics

Astrophysics

30

Line: Formation, Line: Profiles, Stars: Circumstellar Matter, Stars: Emission-Line, Be, Stars: Individual: Gamma Cas, Stars: Individual: 59 Cyg

Scientific paper

A new explanation for the spectacular emission line variations occuring in the Be stars gamma Cas and 59 Cyg is presented. We propose a circumstellar Keplerian disk, tilted with respect to the equatorial plane. The precessing nodal and apsidal line causes a variation in the emission line widths and profile shapes. In particular the sequence of alternating shell-phases and narrow single-peak phases is proposed to be due to an apparent variation in the disk inclination.

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