Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0508s&link_type=abstract
American Astronomical Society Meeting 208, #5.08; Bulletin of the American Astronomical Society, Vol. 38, p.84
Astronomy and Astrophysics
Astronomy
Scientific paper
RS Oph is a recurrent symbiotic nova, in which a white dwarf orbits inside the outer layers/wind of a red giant. The system has had numerous recorded outbursts (1898, 1933, 1958, 1967, 1985). The most recent outburst began on 2006 February 12. In previous outbursts, RS Oph was well studied in the optical, ultraviolet (IUE), and the radio. There were 6 pointings by EXOSAT during the 1985 outburst but the first was not until 55 days after discovery. For the 2006 outburst, X-ray observations began within a few days of discovery and now include data from RXTE, Swift, Chandra, and XMM-Newton. We report that RS Oph was extremely bright in X-rays at maximum and its X-ray spectrum has evolved on a nearly daily basis. The X-ray observations, in combination with radio observations obtained with the VLA and VLBA, confirm the current model for the outburst: a massive white dwarf accretes material from a red giant secondary until a thermonuclear runaway ensues and high velocity gas is ejected from the white dwarf. Because the white dwarf is orbiting inside the outer layers/wind of the red giant, a strong shock system is established, the evolution of which can be followed from observations across the electromagnetic spectrum. We will report on the X-ray, infrared (Spitzer), and radio observations, obtained during this outburst, along with the current state of RS Oph. S. Starrfield acknowledges partial support to ASU from NSF and NASA.
Beardmore Andrew
Bode Michael F.
Bond Howard E.
Davis Randall
Drake Jeremy J.
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