Heavy element abundances in DA white dwarfs

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dc.creatorBarstow, M. A.
dc.creatorBurleigh, M. R.
dc.creatorBannister, N. P.
dc.creatorHolberg, J. B.
dc.creatorHubeny, I.
dc.creatorBruhweiler, F. C.
dc.creatorNapiwotzki, R.
dc.date2000-10-23
dc.date.accessioned2026-07-07T01:56:10Z
dc.date.available2026-07-07T01:56:10Z
dc.descriptionWe present a series of systematic abundance measurements for a group of hot DA white dwarfs in the temperature range 20,000-75,000K, based on far-UV spectroscopy with STIS on HST, IUE and FUSE. Using our latest heavy element blanketed non-LTE stellar atmosphere calculations we have addressed the heavy element abundance patterns for the hottest stars for the first time, showing that they are similar to objects like G191-B2B. The abundances observed in the cooler (<50,000K) white dwarfs are something of a mystery. Some of the patterns (e.g. REJ1032) can be explained by self-consistent levitation-diffusion calculations but there is then a serious difficulty in understanding the appearance of the apparently pure H atmospheres. We also report the detection of photospheric HeII in the atmosphere of WD2218+706.
dc.description6 Pages, to be published in the Proceedings of the 12th European White Dwarf Workshop, Eds. H.L. Shipman and J.L. Provencal, ASP Conference series
dc.identifierhttps://arxiv.org/abs/astro-ph/0010448
dc.identifierhttp://arxiv.org/abs/astro-ph/0010448
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1900
dc.subjectAstrophysics
dc.titleHeavy element abundances in DA white dwarfs
dc.typetext

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