Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301l..61p&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. L61-L65.
Astronomy and Astrophysics
Astrophysics
45
B Stars, Emission Spectra, H Alpha Line, Stellar Mass Ejection, Stellar Spectrophotometry, Ultraviolet Spectra, Charge Coupled Devices, Iue, Line Shape, Photosphere, Stellar Envelopes
Scientific paper
A series of recent CCD observations which shows the rapid development of Hα emission in the pulsating, transient Be star μ Cen in only 2 days and thus establishes a time scale for the physical changes in the photosphere that lead to the outburst, are presented. On 1985 March 25, Hα was in pure absorption in μ Cen but by 1985 March 27 a centrally reversed emission feature was observed. Postoutburst observations revealed that the Hα emission increased slightly in strength and then waned within a period 1 month. Complementary observations of He I 6678 as well as UV spectra from IUE are used to discuss the extent of photospheric activity associated with the outburst and line-of-sight mass flow into the circumstellar envelope.
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