Non-LTE metal abundances in V652 Her and HD144941

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dc.creatorPrzybilla, N.
dc.creatorNieva, M. F.
dc.creatorHeber, U.
dc.creatorJeffery, C. S.
dc.date2005-12-06
dc.date.accessioned2026-07-07T06:49:03Z
dc.date.available2026-07-07T06:49:03Z
dc.descriptionTwo evolutionary scenarios are proposed for the formation of extreme helium stars: a post-AGB star suffering from a late thermal pulse, or the merger of two white dwarfs. An identification of the evolutionary channel for individual objects has to rely on surface abundances. We present preliminary results from a non-LTE analysis of CNO, Mg and S for two unique objects, V652 Her and HD144941. Non-LTE abundance corrections for these elements range from negligible values to ~0.7 dex. Non-LTE effects typically lead to systematic shifts in the abundances relative to LTE and reduce the uncertainties.
dc.description4 pages, 2 figures; to appear in: Baltic Astronomy, Proceedings of the Second Meeting on Hot Subdwarf Stars an Related Objects, La Palma, June 2005
dc.identifierhttps://arxiv.org/abs/astro-ph/0512153
dc.identifierhttp://arxiv.org/abs/astro-ph/0512153
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104193
dc.subjectAstrophysics
dc.titleNon-LTE metal abundances in V652 Her and HD144941
dc.typetext

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