Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence

Details Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence

2004-05-13

arxiv.org/abs/astro-ph/0405263v1

Astronomy and Astrophysics

Astrophysics

6 figures, 10 printed page in the journal, to appear in APJ, 1 Sept. 2004 issue, vol. 612

Scientific paper

10.1086/422418

We present a 904-1183 A spectrum of the dwarf nova VW Hydri taken with the Far Ultraviolet Spectroscopic Explorer during quiescence, eleven days after a normal outburst, when the underlying white dwarf accreter is clearly exposed in the far ultraviolet. However, model fitting show that a uniform temperature white dwarf does not reproduce the overall spectrum, especially at the shortest wavelengths. A better approximation to the spectrum is obtained with a model consisting of a white dwarf and a rapidly rotating ``accretion belt''. The white dwarf component accounts for 83% of the total flux, has a temperature of 23,000K, a v sin i = 400 km/s, and a low carbon abundance. The best-fit accretion belt component accounts for 17% of the total flux, has a temperature of about 48,000-50,000K, and a rotation rate Vrot sin i around 3,000-4,000 km/s. The requirement of two components in the modeling of the spectrum of VW Hyi in quiescence helps to resolve some of the differences in interpretation of ultraviolet spectra of VW Hyi in quiescence. However, the physical existence of a second component (and its exact nature) in VW Hyi itself is still relatively uncertain, given the lack of better models for spectra of the inner disk in a quiescent dwarf nova.

Affiliated with

Also associated with

No associations

Rating

Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-618095