The accretion disk (belt?) during the quiescence of VW Hydri

M. Huang, E. M. Sion, Ivan - Hubeny, F. H. Cheng, P. Szkody

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We considered the contribution of an accretion disk to the UV spectrum of the dwarf nova (DN) VW Hydri during its quiescence, obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST). Our analysis indicates that the UV emitting area of the disk is a ring of width 0.06 RWD, inclination angle i = 60°, rotating with Keplerian velocity on the white dwarf surface of 3350 km/s. The other parameters of the ring are log g = 6.0, 7eff = 28,000 K, C and Si enhanced to 20 and 15 times their solar abundances, respectively, and the abundance of all other heavy elements having solar values. The disk area outside this UV emitting region has a Teff much lower than 10,000 K. Our modelling does not rule out that the ring could actually be a belt on the white dwarf. For the central white dwarf, our analysis yields a Teff = 22,000± 1000 K, log g = 8.0, with the abundance of all heavy elements 0.3 times their solar values. The disk contributes about 12% of the total far UV flux in the FOS far ultraviolet region.

Original languageEnglish (US)
Pages (from-to)2386-2390
Number of pages5
JournalAstronomical Journal
Volume111
Issue number6
DOIs
StatePublished - Jun 1996
Externally publishedYes

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accretion disks
faint objects
accretion
heavy elements
spectrographs
rings
Hubble Space Telescope
inclination
modeling
analysis
parameter

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The accretion disk (belt?) during the quiescence of VW Hydri. / Huang, M.; Sion, E. M.; Hubeny, Ivan -; Cheng, F. H.; Szkody, P.

In: Astronomical Journal, Vol. 111, No. 6, 06.1996, p. 2386-2390.

Research output: Contribution to journalArticle

Huang, M, Sion, EM, Hubeny, I, Cheng, FH & Szkody, P 1996, 'The accretion disk (belt?) during the quiescence of VW Hydri', Astronomical Journal, vol. 111, no. 6, pp. 2386-2390. https://doi.org/10.1086/117972
Huang, M. ; Sion, E. M. ; Hubeny, Ivan - ; Cheng, F. H. ; Szkody, P. / The accretion disk (belt?) during the quiescence of VW Hydri. In: Astronomical Journal. 1996 ; Vol. 111, No. 6. pp. 2386-2390.
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AU - Szkody, P.

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