SIMBAD references

J.-U. Ness and S. Starrfield, Arizona State University; J. J. Drake, Smithsonian Astrophysical Observatory; M. Orio, Istituto Nazionale di Astrofisica and University of Wisconsin; 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; J. Krautter, University of Heidelberg; A. Evans, Keele University; S. P. S. Eyres, University of Central Lancashire; and R. Gehrz and C. Woodward, University of Minnesota, report on the first high- resolution x-ray spectra of the outburst of the recurrent nova RS Oph (cf. IAUC 8671), obtained on Feb. 26 (two weeks after the beginning of the outburst). The Chandra X-ray Observatory High Energy Transmission Grating and ACIS-S detector observed RS Oph for 10000 s in the wavelength range 0.15-2.5 nm, revealing a rich emission-line spectrum dominated by resonance lines of He-like and H-like ions of Fe, S, Si, Mg, and Ne superimposed on a strong continuum. The lines seen indicate that a wide range of plasma temperatures have been observed: the coolest transition detected is the O VIII Lyman_alpha doublet at 1.897 nm (emissivity peak at T = 3 MK), while the hottest is the Fe XXV 1s2p-1s2 resonance line (emissivity peak at T = 60 MK). Lines show broadening corresponding to approximately 2000 km/s at half maximum, with systematic blueshifts amounting to approximately 500 km/s (Si XIV, Mg XII, and Ne X) and 1000 km/s (O VIII).