Observation of the onset of an emission episode in the Be star MU Centauri

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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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