Monitoring Dynamical Mass Loss from Eta Car with the HETG

Details Monitoring Dynamical Mass Loss from Eta Car with the HETG Monitoring Dynamical Mass Loss from Eta Car with the HETG

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2779c&link_type=abstract

Chandra proposal ID #11200668

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Scientific paper

Eta Car is a key object for understanding how mass and angular momentum change as a star heads towards hypernova. Periodic minima in X-rays and other wavebands show it as an extremely eccentric binary with a massive companion. A surprising change in the X-ray emission during the January 2009 X-ray minimum probably indicates a large-scale variation in the system mass loss which implies a significant change in the luminosity of one of the stars. X-ray line profiles are the best diagnostic of the wind-wind collision and the structure of the interacting winds. We propose to obtain HETGS spectra of the system during AO11 in a phase interval never before sampled, along with STIS mapping which will constrain the 3-D shape of the wind-wind interaction regions on scales of 1-1000AU.

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