Suggested new observational criteria and a new working hypothesis for the structural modeling of Be-star envelopes

Details Suggested new observational criteria and a new working hypothesis for the structural modeling of Be-star envelopes Suggested new observational criteria and a new working hypothesis for the structural modeling of Be-star envelopes

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148...59b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. 59-66.

Astronomy and Astrophysics

Astrophysics

17

B Stars, Stellar Envelopes, Stellar Models, Stellar Oscillations, Stellar Structure, Stellar Winds, Emission Spectra, H Alpha Line, Phase Shift, Stellar Mass Ejection, Ultraviolet Spectra, Variable Stars

Scientific paper

Observational criteria are proposed for structural models of Be star envelopes. The purposes of the criteria were: (1) to make it possible to distinguish between axisymmetric and nonaxisymmetric models; and (2) to determine whether Be star envelopes are flattened or not. The observational criteria include the starting phase angles of quasi-sinusoidal shell variations; the phase lags between V/R curves of different emission lines; and the detectability of photospheric variations in H-alpha observations of pole-on stars. Several effects of nonradial pulsations on Be star envelopes are considered. A new working hypothesis is proposed concerning the modulation of mass losses with time; inhomogeneities of radiation-driven wind in stars whose luminosity is insufficient to generate wind; and the transport of angular momentum between different regions of a Be star envelope.

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