Observational evidence for a prograde one-armed density structure in the equatorial disc of a Be star

Details Observational evidence for a prograde one-armed density structure in the equatorial disc of a Be star Observational evidence for a prograde one-armed density structure in the equatorial disc of a Be star

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..558t&link_type=abstract

Astronomy and Astrophysics 288, 558-560 (1994)

Astronomy and Astrophysics

Astrophysics

42

Stars: Emission-Line, Be, Circumstellar Matter, Individual: {Beta}^1^ Mon

Scientific paper

We discuss the implications of the observations of the Be star β^1^ Mon, as presented by Cowley & Gugula (1973), for the theory of one-armed density perturbations in the equatorial discs of Be stars. This theory aims to describe the nature of the long-term (cycles of a few to several years) V/R variations of the Balmer and other emission lines of these stars (Okazaki 1991 and Papaloizou et al. 1992). From the observations of β^1^ Mon we infer that a one-armed density structure revolved around the star in the same direction as the nearly Keplerian orbits of the disc material. We conclude that these observations are consistent with a model which predicts prograde precession of a one-armed density perturbation.

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