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AGB nucleosynthesis...
AGB nucleosynthesis in the Large Magellanic Cloud : Detailed abundance analysis of the RV Tauri star MACHO 47.2496.8
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Reyniers, M. (författare)
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Abia, C. (författare)
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van Winckel, H. (författare)
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Lloyd Evans, T. (författare)
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Decin, L. (författare)
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- Eriksson, Kjell (författare)
- Uppsala universitet,Institutionen för astronomi och rymdfysik
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Pollard, K. R. (författare)
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(creator_code:org_t)
- 2006-10-09
- 2007
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 461:2, s. 641-650
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. 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 MACHO 47.2496.8 in the LMC. Methods. High-resolution, high signal-to-noise ESO VLT-UVES spectra of MACHO 47.2496.8 are analysed by performing detailed spectrum synthesis modelling using state-of-the-art carbon-rich MARCS atmosphere models. Results. The spectrum of MACHO 47.2496.8 is not only dominated by bands of carbon bearing molecules, but also by lines ofatomic 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 1.2dex compared to iron ([Is/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 RVTauri star MACHO 47.2496.8 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Carbon oxygen ratio
- Magellanic Clouds
- Asymptotic giant branch
- Low-mass stars
- Luminosity function
- Carbon stars
- Luminosity
- Heavy element
- Light element
- Metallicity
- s process
- Atmosphere model
- RV Tauri stars
- Stellar abundance
- Large Magellanic Cloud
- Nucleosynthesis
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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