Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..211b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 211-222.
Astronomy and Astrophysics
Astrophysics
31
B Stars, H Alpha Line, Stellar Mass Ejection, Astronomical Photometry, Centaurus Constellation, Spectral Resolution, Stellar Spectrophotometry
Scientific paper
An H-alpha outburst of Mu Centauri in February 1987 is examined in detail, using both high-resolution spectroscopy, medium-resolution spectrophotometry, and VBLUW photometry. Observations show that the total equivalent width of H-alpha emission decreased by 1.5 A in two days. The outburst was accompanied by line profile variability of the C II 6578, 6583 A doublet which included V/R variations of emission components after the event. The outburst was followed by two comparable, slightly fainter ones 17 and 19 days after the original event. Using a synopsis of a similar event, the general pattern of such outbursts is abstracted, outlining problems of elliptical ring and decelerated, balloon filling models. The processes governing the mass loss from Be stars and the evolution of their envelopes are also discussed.
Baade Dietrich
Daachs J.
de Weygaert Rien van
Steeman F.
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