IAU Circ., 8675, 2 (2006/February-0)
BODE M.F., O'BRIEN T.J., DAVIS R.J., OSBORNE J., PAGE K.L., SCHWARZ G., STARRFIELD S., NESS J.-U., KRAUTTER J., DRAKE J., EVANS A. and EYRES S.P.S.
Abstract (from CDS):
M. F. Bode, Liverpool John Moores University; T. J. O'Brien and R. J. Davis, University of Manchester; J. Osborne and K. L. Page, University of Leicester; G. Schwarz, West Chester University; S. Starrfield and J.-U. Ness, Arizona State University; J. Krautter, University of Heidelberg; J. Drake, Smithsonian Astrophysical Observatory; A. Evans, Keele University; and S. P. S. Eyres, University of Central Lancashire, report that Swift XRT observations of the latest outburst of RS Oph (IAUC 8671) show this to be a very bright and rapidly evolving x-ray source: "The first observations, obtained on Feb. 16.21 UT (3.38 days after reported outburst), gave a total XRT countrate of 11.8 ± 0.2 counts/s. The x-ray spectrum could be well fitted with a strongly absorbed high-temperature thermal bremsstrahlung model plus an Fe K line and absorption edge: kT > 70 keV (90-percent confidence), E_line = 6.66 ± 0.02 keV, E_edge = 7.18 ± 0.09 keV, and N_H = (2.3 ± 0.1) x 10**(22) cm**(-2). Observations on Feb. 17.89 show the source to be around three times brighter in the XRT band, and the spectrum shows clear evidence of line emission from other elements as well as Fe. A preliminary solar abundance spectral fit requires four temperature components plus an Fe K line and absorption edge. In this fit, N_H = (1.7 +0.11/-0.22) x 10**(22) cm**(-2). We note that these fits may not be unique and should be considered simply empirical at this stage. Detailed hydrodynamic modelling is now in progress. Observations and modelling of the previous outburst in 1985 (see, e.g., O'Brien et al. 1992, MNRAS 255, 683) suggest that RS Oph will continue to evolve rapidly in the x-ray range over the coming weeks. We also urge continued monitoring at other wavelengths, in particular optical spectroscopy, for the next several months. Swift observations are ongoing."
+ erratum in IAUC 8677
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