Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4231c&link_type=abstract
American Astronomical Society, HEAD meeting #11, #42.31; Bulletin of the American Astronomical Society, Vol. 41, p.730
Astronomy and Astrophysics
Astronomy
Scientific paper
We discuss X-ray and Gamma-ray observations of the superluminous extremely massive binary system Eta Carinae through the most recent X-ray minimum/periastron passage in January 2009. X-ray monitoring with RXTE shows that the minimum began on 16 January 2009, consistent with a period of 2024 days. Prior to the X-ray minimum, the flux of the system in the 2-10 keV band and X-ray hardness decreased compared to the previous cycle. Most intriguingly, the X-ray flux began to recover from the minimum state about one month earlier than expected from observations of the previous two X-ray minima in 1998 and 2003. Chandra grating spectra obtained from 2002 to 2009 show marked variations in the flow dynamics as measured by the profiles of strong X-ray lines. We also compare the X-ray variations to the time-resolved gamma-ray emission measured by AGILE and Fermi. The X-ray emission variations suggest a significant decline in wind strength from eta Car starting shortly after the previous periastron passage.
Corcoran Michael F.
Gull Ted
Hamaguchi Kenji
Okazaki Atsuo
Parkin Ross
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