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Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence
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Sion, Edward M., Gaensicke, B. T. (Boris T.), Long, Knox S., Szkody, Paula, Knigge, Christian, Hubený, I. (Ivan), deMartino, Domitilla and Godon, Patrick (2008) Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence. The Astrophysical Journal, Volume 681 (Number 1). pp. 543-553. doi:10.1086/586699 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1086/586699
Abstract
We present the results of a synthetic spectral analysis of HST STIS spectra of five long-period dwarf novae obtained during their quiescence to determine the properties of their white dwarfs, which are little known for systems above the CV period gap. The five systems, TU Men, BD Pav, SS Aur, TT Crt, and V442 Cen, were observed as part of an HST Snapshot project. The spectra are described and fitted with combinations of white dwarf photospheres and accretion disks. We provide evidence that the white dwarfs in all five systems are at least partially exposed. We discuss the evolutionary implications of our model-fitting results and compare these dwarf novae to previously analyzed FUV spectra of other dwarf novae above the period gap. The dispersion in CV WD temperatures above the period gap is substantially greater than one finds below the period gap, where there is a surprisingly narrow dispersion in temperatures around 15,000 K. There appears to be a larger spread of surface temperatures in dwarf novae above the period than is seen below the gap.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Accretion (Astrophysics), Dwarf novae -- Spectra, White dwarf stars | ||||
| Journal or Publication Title: | The Astrophysical Journal | ||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | 1 July 2008 | ||||
| Dates: |
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| Volume: | Volume 681 | ||||
| Number: | Number 1 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 543-553 | ||||
| DOI: | 10.1086/586699 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | United States. National Aeronautics and Space Administration (NASA), Hubble Space Telescope (Spacecraft) (HST), National Science Foundation (U.S.) (NSF), Agenzia spaziale italiana [Italian Space Agency] (ASI), Istituto nazionale di astrofisica (Italy) (INAF) | ||||
| Grant number: | NNG04GE78G (NASA), GO- 09357.02A, GO-09724.06A and GO-09724.02A (HST), AST 05-07514 (NSF), I /023/05/0 (ASF, INAF) |
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