Long-term and mid-term spectroscopic variations of the Be-shell star HD 184279 (V 1294 Aql) - Towards a model

Astronomy and Astrophysics – Astrophysics

Scientific paper

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B Stars, Shell Stars, Stellar Models, Stellar Spectrophotometry, Balmer Series, H Beta Line, Radial Velocity, Spectral Line Width, Stellar Envelopes, Stellar Structure

Scientific paper

On the basis of the spectroscopic data described by Ballereau and Chauville (1987), a structural modeling is developed for the shell of the Be star HD 184279 (V 1294 Aql, B1 IV-V). After a review of the main spectroscopic features and their variations betwen 1976 and 1987, several structural modelings are summarized to explain the V/R variations undergone by the spectrum of this star. Two possibilities can be retained: the hypothesis of the elongated disk model with orbital and apsidal motions (geometrical model) and the axisymmetric rotating-pulsating model (physical model). After comparison of the spectroscopic variations observed with those predicted, the elongated disk is selected.

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