Iron in Hot DA White Dwarfs

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dc.creatorVennes, Stephane
dc.creatorChayer, Pierre
dc.creatorDupuis, Jean
dc.creatorLanz, Thierry
dc.date2006-08-20
dc.date.accessioned2026-07-07T10:39:49Z
dc.date.available2026-07-07T10:39:49Z
dc.descriptionWe present a study of the iron abundance pattern in hot hydrogen-rich (DA) white dwarfs. The study is based on new and archival far ultraviolet spectroscopy of a sample of white dwarfs in the temperature range 30,000 K < T_eff < 64,000 K. The spectra obtained with the Far Ultraviolet Spectroscopic Explorer along with spectra obtained with the Hubble Space Telescope Imaging Spectrograph and the International Ultraviolet Explorer sample FeIII to FeVI absorption lines enabling a detailed iron abundance analysis over a wider range of effective temperatures than previously afforded. The measurements reveal abundance variations in excess of two orders of magnitude between the highest and the lowest temperatures probed, but also show considerable variations (over one order of magnitude) between objects with similar temperatures and surface gravities. Such variations in cooler objects may be imputed to accretion from unseen companions or so-called circumstellar debris although the effect of residual mass-loss and selective radiation pressure in the hottest objects in the sample remain dominant.
dc.descriptionAccepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0608416
dc.identifierhttp://arxiv.org/abs/astro-ph/0608416
dc.identifierAstrophys.J.652:1554-1562,2006
dc.identifierdoi:10.1086/508509
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181163
dc.subjectAstrophysics
dc.titleIron in Hot DA White Dwarfs
dc.typetext

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