Abundance Analyses of Field RV Tauri Stars. VI. An Extended Sample

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dc.contributor.authorGiridhar, S.
dc.contributor.authorLambert, David L
dc.contributor.authorReddy, B.E.
dc.contributor.authorGonzalez, G.
dc.contributor.authorYong, David
dc.date.accessioned2015-12-08T22:25:23Z
dc.date.issued2005
dc.date.updated2015-12-08T09:05:16Z
dc.description.abstractAn abundance analysis is presented and discussed for a sample of 14 RV Tauri stars. The present abundance data and those from our previous papers and by other workers are combined in an attempt to further understanding of the dust-gas separation process that afflicts many RV Tauri variables. We propose that a star's intrinsic (i.e., initial) metallicity is given by the photospheric zinc abundance. Variables warmer than about 5000 K and with an initial metallicity [Fe/H] ≥ -1 are affected by dust-gas separation. Variables of all metallicities and cooler than about Teff ≃ 5000 K are unaffected by dust-gas separation. The RV Tauri variables show a spread in their C abundances, with the lower boundary of the points in the C versus Zn plane falling close to the predicted trend for giants after the first dredge-up. The upper boundary is inhabited by a few stars that are carbon-rich. The O abundances in the mean follow the predicted trend from unevolved stars, in line with the expectation that photospheric O abundance is unaffected by the first dredge-up. An evolutionary scenario involving mass loss by a first-ascent or early-AGB red giant, the primary star of a binary, is sketched.
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/33408
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Stars: abundances; Stars: AGB and post-AGB; Stars: variables: other
dc.titleAbundance Analyses of Field RV Tauri Stars. VI. An Extended Sample
dc.typeJournal article
local.bibliographicCitation.lastpage445
local.bibliographicCitation.startpage432
local.contributor.affiliationGiridhar, S., Indian Institute of Astrophysics
local.contributor.affiliationLambert, David L, University of Texas
local.contributor.affiliationReddy, B.E., Indian Institute of Astrophysics
local.contributor.affiliationGonzalez, G., Iowa State University
local.contributor.affiliationYong, David, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailu3207952@anu.edu.au
local.contributor.authoruidYong, David, u3207952
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu3379551xPUB102
local.identifier.citationvolume627
local.identifier.doi10.1086/430265
local.identifier.scopusID2-s2.0-24144448779
local.identifier.uidSubmittedByu3379551
local.type.statusPublished Version

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