Search For Oxygen in Cool DQ White Dwarf Atmospheres

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dc.creatorKilic, M.
dc.creatorWinget, D. E.
dc.creatorvon Hippel, T.
dc.creatorLester, D. F.
dc.creatorSaumon, D.
dc.date2002-09-15
dc.date.accessioned2026-07-07T02:05:11Z
dc.date.available2026-07-07T02:05:11Z
dc.descriptionWe report new infrared spectroscopic observations of cool DQ white dwarfs by using Coolspec on the 2.7m Harlan-Smith Telescope. DQs have helium-rich atmospheres with traces of molecular carbon thought to be the result of convective dredge-up from their C/O interiors. Recent model calculations predict that oxygen should also be present in DQ atmospheres in detectable amounts. Our synthetic spectra calculations for He-rich white dwarfs with traces of C and O indicate that CO should be easily detected in the cool DQ atmospheres if present in the expected amounts. Determination of the oxygen abundance in the atmosphere will reveal the C/O ratio at the core/envelope boundary, constraining the important and uncertain ^{12}C(alpha,gamma)^{16}O reaction rate.
dc.description2 pages, 2 figures, to appear in proceedings of the 13th European Workshop on White Dwarfs
dc.identifierhttps://arxiv.org/abs/astro-ph/0209286
dc.identifierhttp://arxiv.org/abs/astro-ph/0209286
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5023
dc.subjectAstrophysics
dc.titleSearch For Oxygen in Cool DQ White Dwarf Atmospheres
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