Seven problems related to the determination of the primordial helium abundance

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dc.creatorPeimbert, Manuel
dc.creatorPeimbert, Antonio
dc.creatorLuridiana, Valentina
dc.creatorRuiz, Maria Teresa
dc.date2002-11-22
dc.date.accessioned2026-07-07T02:06:29Z
dc.date.available2026-07-07T02:06:29Z
dc.descriptionRecent advances on the quest to determine the primordial or pregalactic helium abundance, Yp, are reviewed. There are seven problems affecting the He/H abundance determinations of H II regions that are briefly discussed: the underlying absorption lines in the observed spectra, the ionization, temperature, and density structures of each object, the collisional contribution to the intensity of the He I and H I lines, the optical thickness of the He I lines, and the extrapolation to derive Yp based on the Y and O/H values.
dc.description10 pages. Conference on Star Formation through Time (ASP Conference Series)
dc.identifierhttps://arxiv.org/abs/astro-ph/0211497
dc.identifierhttp://arxiv.org/abs/astro-ph/0211497
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5384
dc.subjectAstrophysics
dc.titleSeven problems related to the determination of the primordial helium abundance
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