Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..283b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 283-286.
Astronomy and Astrophysics
Astrophysics
18
B Stars, Stellar Envelopes, Stellar Spectrophotometry, Emission Spectra, H Beta Line, High Resolution, Stellar Mass Ejection
Scientific paper
High resolution high signal-to-noise observations show significant spectroscopic variations of Eta Cen on a timescale of hours. The observing frequency is not sufficient to decide if the variations are periodic. In June 1982, Eta Cen was observed outside a shell phase, but at the bottom of H-beta a very faint, rapidly variable emission feature was detected. This is reminiscent of Doazan's (1975) observations of Omicron And during its intershell phase of 1973, shortly before new shell lines became visible. The observations of Eta Cen are interpreted as further evidence that rapid variability is the variability of the central star. It is speculated that the rapid variability of the faint central emission line is directly related to the ejection of matter into a circumstellar envelope. This assumption is supported by the recent observation that by January 1983 Eta Cen had in fact entered into a new shell phase.
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