The X-ray Variability Of Eta Car, 1996-2010

Details The X-ray Variability Of Eta Car, 1996-2010 The X-ray Variability Of Eta Car, 1996-2010

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542601c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #426.01; Bulletin of the American Astronomical Society, Vol. 42, p.340

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray photometry in the 2--10 keV band of the the supermassive binary star Eta Car has been measured with the Rossi X-ray Timing Explorer from 1996--2010. The ingress to X-ray minimum is consistent with a period of 2024 days. The 2009 X-ray minimum began on January 16 2009 and showed an unexpectedly abrupt recovery starting after 12 Feb 2009. The X-ray colors become harder about half-way through all three minima and continue until flux recovery. The behavior of the fluxes and X-ray colors for the most recent X-ray minimum, along with Chandra high resolution grating spectra at key phases suggests a significant change in the inner wind of Eta Car, a possible indicator that the star is entering a new unstable phase of mass loss.

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