Additional constraints on cool-disk models of Be stars based on long observational sequences in the visual range

Details Additional constraints on cool-disk models of Be stars based on long observational sequences in the visual range Additional constraints on cool-disk models of Be stars based on long observational sequences in the visual range

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..213h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 213-222.

Astronomy and Astrophysics

Astrophysics

20

B Stars, Cool Stars, Early Stars, Radial Velocity, Spectroscopic Analysis, Stellar Models, Variable Stars, Angular Momentum, Shell Stars, Stellar Envelopes

Scientific paper

The authors have examined the main common spectral properties of the 3 well-known early type (≡B2-B4) V/R variable shell stars EW Lac, ζ Tau, 48 Lib, before and during their variable shell phase characterized by long RV (radial velocity) and V/R (intensity ratio of violet to red emission) cycles. They then recall the two current cool envelope models which could explain the V/R or R/V cycles (in particular the V/R > 1 phase or positive R/V phase): (1) the non-axisymmetrical elliptical disk, and (2) the rotating-pulsating axisymmetrical envelope (or disk) model. The authors present the spectroscopic observations deduced from their comparison of the 3 V/R variable shell stars EW Lac, ζ Tau, 48 Lib which are in favour of or against these two models. They conclude that the 3 stars present signatures of both a geometrical model (elongated disk with apsidal motion) and a physical model (variable radial flux).

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