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| Paper: |
Eclipse and Collapse of the Colliding Wind X-ray Emission from Eta Carinae |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
325 |
| Authors: |
Hamaguchi, K.; Corcoran, M. F.; Eta Carinae Team |
| Abstract: |
X-ray emission from the massive stellar binary system, η Carinae, drops strongly around periastron passage.
We launched a focused observing campaign in early 2009 to understand the mechanism, which causes the X-ray minimum.
During the campaign, hard X-ray emission (< 10 keV) from η Carinae declined as in the previous minimum, though it recovered a month earlier.
Extremely hard X-ray emission between 15–25 keV, closely monitored for the first time with the Suzaku HXD/PIN, decreased similarly to the hard X-rays,
but it reached minimum only after hard X-ray emission from the star had already began to recover.
This indicates that the X-ray minimum is produced by two composite mechanisms: the thick primary wind first obscured
the hard, 2–10 keV thermal X-ray emission from the wind-wind collision (WWC) plasma;
the WWC activity then decays as the two stars reach periastron. |
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