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dc.contributor.authorMoehler, S.
dc.contributor.authorHeber, U.
dc.contributor.authorLemke, M.
dc.contributor.authorNapiwotzki, R.
dc.date.accessioned2008-01-25T10:11:21Z
dc.date.available2008-01-25T10:11:21Z
dc.date.issued1998
dc.identifier.citationMoehler , S , Heber , U , Lemke , M & Napiwotzki , R 1998 , ' Abundances of UV bright stars in globular clusters. I. ROA 5701 in omega Centauri and Barnard 29 in M 13 ' , Astronomy and Astrophysics , vol. 339 , pp. 537-544 .
dc.identifier.issn1432-0746
dc.identifier.otherPURE: 142831
dc.identifier.otherPURE UUID: 0bd44fb5-69dd-4435-b8b8-1484e4921d59
dc.identifier.otherdspace: 2299/1386
dc.identifier.otherScopus: 0007389522
dc.identifier.urihttp://hdl.handle.net/2299/1386
dc.description.abstractTwo UV brights stars in globular clusters, ROA 5701 (ω Cen) and Barnard 29 (M 13) are analysed from high-resolution UV and optical spectra. The main aim is the measurement of iron abundances from UV spectra obtained with the HST-GHRS. In addition atmospheric parameters and abundances for He, C, N, O, and Si are derived from optical spectra (ESO CASPEC) for ROA 5701 or taken from literature for Barnard 29. Both stars are found to be post-asymptotic giant branch stars. Surprisingly, their iron abundances lie significantly below the cluster abundance in both cases. Barnard 29 lies 0.5 dex below the iron abundance derived for giant stars in M 13 and the iron abundance of ROA 5701 is the lowest of any star in ω Cen analysed so far. Barnard 29 shows the same abundance pattern as the red giant stars in M 13, except for its stronger iron deficiency. The iron depletion could be explained by gas-dust separation in the AGB progenitor’s atmosphere, if iron condensed into dust grains which were then removed from the atmosphere by a radiatively driven wind. The interpretation of the abundance pattern for ROA 5701 is hampered by the star-tostar abundance variations seen in ω Cen, but its abundance pattern appears to be consistent with the gas-dust separation scenario.en
dc.language.isoeng
dc.relation.ispartofAstronomy and Astrophysics
dc.rightsOpen
dc.titleAbundances of UV bright stars in globular clusters. I. ROA 5701 in omega Centauri and Barnard 29 in M 13en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted1998
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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