SIMBAD references

2004ApJ...610..422M - Astrophys. J., 610, 422-426 (2004/July-3)

Chandra low energy transmission grating spectrum of SS Cygni in outburst.

MAUCHE C.W.

Abstract (from CDS):

We have fitted the Chandra Low Energy Transmission Grating (LETG) spectrum of SS Cygni in outburst with a single-temperature blackbody suffering the photoelectric opacity of a neutral column density and the scattering opacity of an outflowing wind. We find that this simple model is capable of reproducing the essential features of the observed spectrum with the blackbody temperature Tbl~250±50 kK, hydrogen column density NH~5.0+2.9–1.5x1019/cm2, fractional emitting area f~5.6+60–4.5x10–3, boundary layer luminosity Lbl~5+18–3x1033ergs/s, wind velocity v~2500km/s, wind mass-loss rate M{dot}w~1.1x1016g/s, and arbitrary values of the wind ionization fractions of 20 ions of O, Ne, Mg, Si, S, and Fe. Given that in outburst the accretion disk luminosity Ldisk~1x1035ergs/s, Lbl/Ldisk~0.05+0.18–0.03, which can be explained if the white dwarf (or an equatorial belt thereon) is rotating with an angular velocity Ωwd~0.7+0.1–0.2Hz, hence Vrotsini∼2300km/s.

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Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Stars: Novae, Cataclysmic Variables - Stars: Individual: Constellation Name: SS Cygni - X-Rays: Binaries

Simbad objects: 9

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