AGB nucleosynthesis in the Large Magellanic Cloud. Detailed abundance analysis of the RV Tauri star MACHO47.2496.8

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dc.creatorReyniers, M.
dc.creatorAbia, C.
dc.creatorVan Winckel, H.
dc.creatorEvans, T. Lloyd
dc.creatorDecin, L.
dc.creatorEriksson, K.
dc.creatorPollard, K. R.
dc.date2006-10-09
dc.date.accessioned2026-07-07T07:39:32Z
dc.date.available2026-07-07T07:39:32Z
dc.descriptionContext. Abundance analysis of post-AGB objects as probes of AGB nucleosynthesis. Aims. A detailed photospheric abundance study is performed on the carbon-rich post-AGB candidate MACHO47.2496.8 in the LMC. Methods. High-resolution, high signal-to-noise ESO VLT-UVES spectra of MACHO47.2496.8 are analysed by performing detailed spectrum synthesis modelling using state-of-the-art carbon-rich MARCS atmosphere models. Results. The spectrum of MACHO47.2496.8 is not only dominated by bands of carbon bearing molecules, but also by lines of atomic transitions of s-process elements. The metallicity of [Fe/H]=-1.4 is surprisingly low for a field LMC star. The C/O ratio, however difficult to quantify, is greater than 2, and the s-process enrichment is large: the light s-process elements are enhanced by 1.2 dex compared to iron ([ls/Fe]=+1.2), while for the heavy s-process elements an even stronger enrichment is measured: [hs/Fe]=+2.1. The lead abundance is comparable to the [hs/Fe]. With its low intrinsic metallicity and its luminosity at the low end of the carbon star luminosity function, the star represents likely the final stage of a low initial mass star. Conclusions. The LMC RV Tauri star MACHO47.2496.8 is highly carbon and s-process enriched, and is most probable a genuine post-C(N-type) AGB star. This is the first detailed abundance analysis of an extragalactic post-AGB star to date.
dc.description12 pages, 6 figures, accepted by A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0610240
dc.identifierhttp://arxiv.org/abs/astro-ph/0610240
dc.identifierAstron.Astrophys. 461 (2007) 641-650
dc.identifierdoi:10.1051/0004-6361:20065893
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/121481
dc.subjectAstrophysics
dc.titleAGB nucleosynthesis in the Large Magellanic Cloud. Detailed abundance analysis of the RV Tauri star MACHO47.2496.8
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