2007A&A...461..641R


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.11CEST15:24:09

2007A&A...461..641R - Astronomy and Astrophysics, volume 461, 641-650 (2007/1-2)

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

REYNIERS M., ABIA C., VAN WINCKEL H., LLOYD EVANS T., DECIN L., ERIKSSON K. and POLLARD K.R.

Abstract (from CDS):

Abundance analysis of post-AGB objects as probes of AGB nucleosynthesis. A detailed photospheric abundance study is performed on the carbon-rich post-AGB candidate MACHO47.2496.8 in the LMC. 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. 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 1.2dex 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. The LMC RVTauri 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.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - stars: carbon - stars: individual: MACHO47.2496.8 - Magellanic Clouds

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9755 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5901 1
3 BD-00 789 * 04 51 40.7678705709 -00 05 13.157760177   9.99 8.98     K0 17 0
4 SOI 98 * 04 55 07.1308266637 -67 49 16.923944699   14.103 14.1     A0II 3 0
5 MACHO 47.2496.19 V* 04 55 37.1478117433 -67 50 02.669862379     15.627     ~ 2 0
6 OGLE LMC-T2CEP-15 RV* 04 55 43.2642447535 -67 51 09.787236567 17.31 16.23 14.93 14.28 14.061 G2-8(R)Ibe: 26 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15283 1
8 HD 47645 * 06 37 25.0095742095 -44 58 33.748862976   7.98 8.04     B8V 19 0
9 V* V453 Oph RV* 17 26 49.1294964352 -02 23 36.433030709   11.7 10.85     A5 56 0
10 MACHO 47.2496.21 Lev ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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