Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011bsrsl..80..578c&link_type=abstract
Société Royale des Sciences de Liège, Bulletin, vol. 80, p. 578-589 (Proceedings of the 39th Liège Astrophysical Colloquium, hel
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
In January 2009, the enigmatic, extremely massive and luminous star ec went through one of its periodic ``minimum'' states in which the excitation of its circumstellar nebula, along with the 2-10 keV emission from the star, collapses for a brief period. Current understanding associates this minimum state with the occurrence of periastron passage of a massive, unseen hot companion star around the much more luminous, much more massive ec. These events offer a direct probe of the mass loss from ec and the system as a whole, with circumstantial evidence tying these events to the spectacular ``Great'' and ``Lesser'' eruptions of the 19^{th} century. As such these events have attracted the interest of a broad community of stellar and nebular astrophysicists. I report here on the results obtained during a nearly pan-chromatic campaign of observations of the January 2009 minimum, with some emphasis on the unique aspects of this particular minimum.
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