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Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence

Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence
Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence
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.
0004-637X
Sion, Edward M.
9fbb544e-ca5a-42d9-b655-26df243de70d
Gänsicke, Boris T.
e53b02f6-aee1-4f86-a12e-d56049f44fb1
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Szkody, Paula
1ff812c4-da79-4507-94e7-fd341ad86ff6
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Hubeny, Ivan
7556b297-9cbd-4339-9bc8-2ba9bba3af0a
deMartino, Domitilla
0874a45d-a0f0-4dfe-8c39-9c5e8bb11a89
Godon, Patrick
b7a1e912-e988-43ee-aba2-765a33afde57
Sion, Edward M.
9fbb544e-ca5a-42d9-b655-26df243de70d
Gänsicke, Boris T.
e53b02f6-aee1-4f86-a12e-d56049f44fb1
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Szkody, Paula
1ff812c4-da79-4507-94e7-fd341ad86ff6
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Hubeny, Ivan
7556b297-9cbd-4339-9bc8-2ba9bba3af0a
deMartino, Domitilla
0874a45d-a0f0-4dfe-8c39-9c5e8bb11a89
Godon, Patrick
b7a1e912-e988-43ee-aba2-765a33afde57

Sion, Edward M., Gänsicke, Boris T., Long, Knox S., Szkody, Paula, Knigge, Christian, Hubeny, Ivan, deMartino, Domitilla and Godon, Patrick (2008) Hubble space telescope STIS spectroscopy of long-period dwarf novae in quiescence. The Astrophysical Journal, 681 (1), [543]. (doi:10.1086/586699).

Record type: Article

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.

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Published date: 1 July 2008

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Local EPrints ID: 144199
URI: http://eprints.soton.ac.uk/id/eprint/144199
ISSN: 0004-637X
PURE UUID: c3b74c4d-c10e-43ca-9f3f-ee50f09121a1

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Date deposited: 19 Apr 2010 08:29
Last modified: 13 Dec 2018 17:30

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Contributors

Author: Edward M. Sion
Author: Boris T. Gänsicke
Author: Knox S. Long
Author: Paula Szkody
Author: Ivan Hubeny
Author: Domitilla deMartino
Author: Patrick Godon

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