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High Resolution Temporal and Spectral Monitoring of Eta Carinae's X-ray Emission Through the June Eclipse
Corcoran, M. F.; Hamaguchi, K.; Henley, D.; Pittard, J. M.; Gull, T. R.; Davidson, K.; Swank, J. H.; Petre, R.; Ishibashi, K.; Eta Car HST Treasury Team
AA(USRA & NASA-GSFC/LHEA), AB(NRC & NASA-GSFC/LHEA), AC(University of Birmingham), AD(The University of Leeds), AE(NASA-GSFC/LASP), AF(University of Minnesota), AG(NASA-GSFC/LHEA), AH(NASA-GSFC/LHEA), AI(MIT)
American Astronomical Society Meeting 203, #58.02; Bulletin of the American Astronomical Society, Vol. 35, p.1302
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The supermassive and luminous star Eta Carinae undergoes strong X-ray variations every 5.5 years when its 2-10 keV X-ray emission brightens rapidly with wild fluctuations before dropping by a factor of 100 to a minimum lasting 3 months. The most recent X-ray ``eclipse" began in June 2003 and during this time Eta Carinae was intensely observed throughout the electromagnetic spectrum. Here we report the first results of frequent monitoring of the 2-10 keV band X-ray emission by the Rossi X-ray Timing Explorer along with high resolution X-ray spectra obtained with the transmission gratings on the Chandra X-ray Observatory. We compare these observations to those results obtained during the previous X-ray eclipse in 1998, and interpret the variations in the X-ray brightness, in the amount of absorption, in the X-ray emission measure and in the K-shell emission lines in terms of a colliding wind binary model.
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