Interplay between diffusion, accretion and nuclear reactions in the atmospheres of Sirius and Przybylski's star

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dc.creatorYushchenko, Alexander
dc.creatorGopka, Vera
dc.creatorGoriely, Stephane
dc.creatorShavrina, Angelina
dc.creatorKang, Young Woon
dc.creatorRostopchin, Sergey
dc.creatorValyavin, Gennady
dc.creatorMkrtichian, David
dc.creatorHatzes, Artie
dc.creatorLee, Byeong-Cheol
dc.creatorKim, Chulhee
dc.date2006-10-20
dc.date.accessioned2026-07-07T07:27:03Z
dc.date.available2026-07-07T07:27:03Z
dc.descriptionThe abundance anomalies in chemically peculiar B-F stars are usually explained by diffusion of chemical elements in the stable atmospheres of these stars. But it is well known that Cp stars with similar temperatures and gravities show very different chemical compositions. We show that the abundance patterns of several stars can be influenced by accretion and (or) nuclear reactions in stellar atmospheres. We report the result of determination of abundances of elements in the atmosphere of hot Am star: Sirius A and show that Sirius A was contaminated by s-process enriched matter from Sirius B (now a white dwarf). The second case is Przybylski's star. The abundance pattern of this star is the second most studied one after the Sun with the abundances determined for about 60 chemical elements. Spectral lines of radioactive elements with short decay times were found in the spectrum of this star. We report the results of investigation on the stratification of chemical elements in the atmosphere of Przybylski's star and the new identification of lines corresponding to short lived actinides in its spectrum. Possible explanations of the abundances pattern of Przybylski's star (as well as HR465 and HD965) can be the natural radioactive decay of thorium, and uranium, the explosion of a companion as a Supernova or nucleosynthesis events at stellar surface.
dc.description7th Pasific Rim conf., Seoul, 2005, November, 8 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0610611
dc.identifierhttp://arxiv.org/abs/astro-ph/0610611
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/117246
dc.subjectAstrophysics
dc.titleInterplay between diffusion, accretion and nuclear reactions in the atmospheres of Sirius and Przybylski's star
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