Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924010h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #240.10
Other
Scientific paper
The X-ray observing campaign of the wind-wind colliding (WWC) binary system, Eta Carinae, targeted at its periastron passage in 2003, discovered extended X-ray emission from the bipolar nebula around the star during X-ray minimum (Corcoran et al. 2004, ApJ). The X-ray spectrum showed a strong fluorescent iron line at 6.4 keV, which was suggested to originate in emission from the central star, absorbed and re-emitted by the bipolar nebula. The X-ray emission would be one of the clearest examples of a reflection component, in which both the emitting source and reflector are clearly identified.
We launched another focused campaign of X-ray observations for Eta Car during its 2009 periastron passage. We again observed the X-ray reflection nebula during the X-ray faintest phase. A Chandra spectrum generated from multiple exposures confirmed strong emission lines at 1.8 and 1.4 keV. The spectrum also showed smaller photo-electric absorption than that in 2003, which is similar to a recent NH decrease of direct emission from Eta Carinae. We dis
Corcoran Michael F.
Eta Carinae Team
Hamaguchi Kenji
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