Study of H-alpha profile in 72 Be stars

Details Study of H-alpha profile in 72 Be stars Study of H-alpha profile in 72 Be stars

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...48...93a&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 48, Apr. 1982, p. 93-136. In French.

Astronomy and Astrophysics

Astrophysics

99

B Stars, H Alpha Line, Spectral Line Width, Stellar Envelopes, Stellar Spectra, Absorption Spectra, Astronomical Catalogs, Astronomical Spectroscopy, Echelette Gratings, Electron Scattering, Gauss Equation, Stellar Rotation

Scientific paper

An H-alpha profile catalog of 72 Be stars observed with the Multiphot system of the Haute Provence Observatory is presented which shows the structure of the H-alpha line emission to be both complex and variable, with a central absorption present in most cases. A correlation with the rotational velocity is confirmed by measurements of widths at mid-height of emission intensity, and the precision of the results presented is judged to have been enhanced by the Gauss function calculation of line profiles. A determination of the H-alpha line wing extension shows that there exist correlations with the mid-height width, the v sin i, and the spectral type; the Be stars of group I are then clearly separable from those of other groups, in agreement with the hypothesized broadening of the H-alpha line from electron scattering of the envelope.

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