ON THE SPECTACULAR VARIATIONS OF BE STARS - EVIDENCE FOR A TEMPORARILY TILTED CIRCUMSTELLAR DISK

Authors
HUMMEL W
Citation
W. Hummel, ON THE SPECTACULAR VARIATIONS OF BE STARS - EVIDENCE FOR A TEMPORARILY TILTED CIRCUMSTELLAR DISK, Astronomy and astrophysics, 330(1), 1998, pp. 243-252
Citations number
65
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
330
Issue
1
Year of publication
1998
Pages
243 - 252
Database
ISI
SICI code
0004-6361(1998)330:1<243:OTSVOB>2.0.ZU;2-6
Abstract
A new explanation for the spectacular emission line variations occurin g in the Be stars gamma Cas and 59 Cyg is presented. We propose a circ umstellar Keplerian disk, tilted with respect to the equatorial plane. The precessing nodal and apsidal line causes a variation in the emiss ion line widths and profile shapes. In particular the sequence of alte rnating shell-phases and narrow single-peak phases is proposed to be d ue to an apparent variation in the disk inclination.