X-ray Monitoring of Eta Car in 2009: Unveiling the Deep X-ray Minimum

Details X-ray Monitoring of Eta Car in 2009: Unveiling the Deep X-ray Minimum X-ray Monitoring of Eta Car in 2009: Unveiling the Deep X-ray Minimum

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2539h&link_type=abstract

Chandra proposal ID #10200901

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray observations of Eta Car near the 2003 periastron passage confirmed that the X-ray emission primarily arises from wind-wind collision (WWC) in a binary system, but raised fundamental questions about the cause of the 3 month-long minimum. The current promising mechanism is either an eclipse of the WWC plasma by primary winds or a fading of the WWC activity due to an increase in gas density, which relates to the mass loss mechanism which influences the evolution of massive stars. To test these scenarios, we propose key, targeted high signal-to noise observations of the faintest phase missed in 2003 to track both the flux and spectral variations. We request joint observations of Eta Car with Chandra and XMM-Newton around the 2009 minimum.

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