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Abundance Analyses of Field RV Tauri Stars. IV. AD Aquilae, DS Aquarii, V360 Cygni, AC Herculis, and V453 Ophiuchi

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dc.contributor.author Giridhar, S
dc.contributor.author Lambert, D. L
dc.contributor.author Gonzalez, G
dc.date.accessioned 2008-08-14T09:44:27Z
dc.date.available 2008-08-14T09:44:27Z
dc.date.issued 1998-12
dc.identifier.citation The Astrophysical Journal, Vol. 509, No. 1, pp. 366 - 378 en
dc.identifier.issn 0004 - 637x
dc.identifier.uri http://hdl.handle.net/2248/3131
dc.description.abstract Abundance analyses are presented and discussed for five RV Tauri variables. Three stars-DS Aqr, V360 Cyg, and V453 Oph-are RV C stars by spectroscopic classification, i.e., metal lines are weak. They are shown to be metal poor with [Fe/H] from -1.0 to -2.2 with normal relative abundances of other elements. By contrast, AD Aql and AC Her are RV B stars with an odd abundance pattern: elements that condense into grains at a high temperatures are underabundant (i.e., [Fe/H] = -2.1 for AD Aql) but elements with a low condensation temperatures are much less underabundant (i.e., [S/H] = 0.0 and [Zn/H] = -0.1 for AD Aql). This abundance pattern is ascribed to a separation of dust and gas in the upper atmosphere of the star. The present analyses with previously published results are used to investigate the systematics of the dust-gas separation in RV Tauri variables. The process is apparently inoperative in stars with an initial metallicity of about [Fe/H] <~ -1.0 RV C stars and similar variables in globular clusters are immune to the dust-gas separation. The process achieves more severe effects in RV B than in RV A stars. The strength of the abundance anomalies attributed to dust-gas separation is not correlated with reported infrared excesses. After correction for the effects of the dust-gas separation, there is no strong evidence from the abundances that evolution along the AGB and experience of the third dredge-up preceded the formation of the majority of the RV Tauri variables. en
dc.format.extent 354198 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher The American Astronomical Society en
dc.relation.uri http://www.journals.uchicago.edu/doi/abs/10.1086/306487 en
dc.subject Stars:Circumstellar Matter en
dc.subject Stars:Abundances en
dc.subject Stars:Variables en
dc.title Abundance Analyses of Field RV Tauri Stars. IV. AD Aquilae, DS Aquarii, V360 Cygni, AC Herculis, and V453 Ophiuchi en
dc.type Article en

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