The Evolution of Disks and Winds in Dwarf Novae Outbursts

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dc.creatorFroning, C. S.
dc.creatorLong, K. S.
dc.creatorDrew, J. E.
dc.creatorKnigge, C.
dc.creatorProga, D.
dc.creatorMattei, J. A.
dc.date2001-09-26
dc.date2001-10-03
dc.date.accessioned2026-07-07T02:00:20Z
dc.date.available2026-07-07T02:00:20Z
dc.descriptionFar ultraviolet (FUV) observations are excellent probes of the inner accretion disk, disk outflows, and the mass-accumulating white dwarf in cataclysmic variables. Here we study the contrasting behavior of two canonical dwarf novae in outburst by presenting FUSE FUV (904 -- 1187 A) spectroscopy of U Gem and SS Cyg. We observed each system four times during a single outburst. The outburst peak and early decline spectra of SS Cyg are well fit by models of a steady-state accretion disk and a biconical wind. A broad, blueshifted OVI wind-formed absorption line is the only strong spectral feature. In late outburst decline, OVI and CIII lines are seen as broad emission features and the continuum has flattened. In U Gem, the continua of the optical outburst plateau spectra are plausibly fit by accretion disk model spectra. The spectra also show numerous narrow, low-velocity absorption lines that do not originate in the inner accretion disk. We discuss the line spectra in the context of partial absorption of the FUV continuum by low-velocity, vertically-extended material located at large disk radii. The late outburst decline spectrum of U Gem is dominated by the white dwarf. WD model fits confirm the sub-solar C and super-solar N abundances found in earlier studies.
dc.description10 pages, 3 figures. To appear in "The Physics of Cataclysmic Variables and Related Objects", ASP Conf. Ser., eds. B.T. Gaensicke, K. Beuermann, K. Reinsch Replaced 10/03/2001 to correct typos
dc.identifierhttps://arxiv.org/abs/astro-ph/0109486
dc.identifierhttp://arxiv.org/abs/astro-ph/0109486
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3401
dc.subjectAstrophysics
dc.titleThe Evolution of Disks and Winds in Dwarf Novae Outbursts
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