Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...53..319a&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 53, Sept. 1983, p. 319-338. In French.
Astronomy and Astrophysics
Astrophysics
61
Astronomical Catalogs, B Stars, H Alpha Line, Stellar Spectra, Variable Stars, Emission Spectra, Spectral Line Width, Stellar Rotation
Scientific paper
The author presents the second catalogue of Hα line profile in 55 Be star spectra. With those published in the first catalogue, the sample is now relative to 127 stars. It appears clearly that the Hα emission is so strong that in most cases (64%) the underlying photospheric absorption line is not visible. Owing to the high resolution used, the author has detected a central absorption in the Hα emission line for 73% of the stars; this absorption feature presents a large diversity of aspects. The widths measured at half maximum of emission intensity are correlated with the rotational velocity of the star. As far as the extension of wings is concerned, it is correlated with the spectral type and with the rotational velocity of the star. The Be stars of group I, characterized by many emission lines are well separated from those of the other groups where the emission lines are rare or absent.
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