Subdwarf O Stars from SDSS and SPY

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dc.creatorHirsch, H. A.
dc.creatorHeber, U.
dc.creatorO'Toole, S. J.
dc.date2008-04-23
dc.date.accessioned2026-07-07T09:34:17Z
dc.date.available2026-07-07T09:34:17Z
dc.descriptionWe present the results of quantitative spectral analysis of sdOs from the SDSS database. Fitting the Balmer, HeI and HeII lines to non-LTE model spectra, we derived their effective temperatures, surface gravities and helium abundances. We find the helium-enriched sdO stars to rally in a small intervall of Teff = 40,000K to 50,000K and log(g) = 5.5 to 6.0. We conclude, that the sdB stars are linked with the helium-deficient sdO stars, i.e. the sdBs are predecessors for the helium-deficient sdOs. To explain the helium-enriched sdO stars in their entirety, we regard two scenarios as most promising: The merging of two helium-core white dwarfs and the late hot flashers.
dc.descriptionto appear in "Hot Subdwarf Stars and Related Objects", ASPC Volume Nr. 392 p.175
dc.identifierhttps://arxiv.org/abs/0804.3698
dc.identifierhttp://arxiv.org/abs/0804.3698
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159435
dc.subjectAstrophysics
dc.titleSubdwarf O Stars from SDSS and SPY
dc.typetext

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