2004A&A...417..269R


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET03:08:37

2004A&A...417..269R - Astronomy and Astrophysics, volume 417, 269-281 (2004/4-1)

A study of the s-process in the carbon-rich post-AGB stars IRAS 06530-0213 and IRAS 08143-4406 on the basis of VLT-UVES spectra.

REYNIERS M., VAN WINCKEL H., GALLINO R. and STRANIERO O.

Abstract (from CDS):

In an effort to extend the still limited sample of s-process enriched post-AGB stars, high-resolution, high signal-to-noise VLT+UVES spectra of the optical counterparts of the infrared sources IRAS06530-0213 and IRAS08143-4406 were analysed. The objects are moderately metal deficient by [Fe/H]=-0.5 and -0.4 respectively, carbon-rich and, above all, heavily s-process enhanced with a [ls/Fe] of 1.8 and 1.5 respectively. Especially the spectrum of IRAS06530-0213 is dominated by transitions of s-process species, and therefore resembling the spectrum of IRAS05341+0852, the most s-process enriched object known so far. The two objects are chemically very similar to the 21 µm objects discussed in Van Winckel & Reyniers (2000A&A...354..135V). A homogeneous comparison with the results of these objects reveals that the relation between the third dredge-up efficiency and the neutron nucleosynthesis efficiency found for the 21µm objects, is further strengthened. On the other hand, a detailed comparison with the predictions of the latest AGB models indicates that the observed spread in nucleosynthesis efficiency is certainly intrinsic, and proves that different 13C pockets are needed for stars with comparable mass and metallicity to explain their abundances.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - stars: carbon - stars: individual: IRAS 06530-0213 - individual: IRAS 08143-4406 - stars: chemically peculiar - stars: evolution - stars: line: identification

VizieR on-line data: <Available at CDS (J/A+A/417/269): table4.dat>

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 - 2020
#notes
1 IRAS 04296+3429 pA* 04 32 56.9768181234 +34 36 12.505781495   16.20 14.21   11.64 G0Ia 134 0
2 IRAS 05341+0852 pA* 05 36 55.0500719686 +08 54 08.646055747   15.36 13.55 12.46 11.43 F6I 104 0
3 IRAS 06530-0213 pA* 06 55 31.8196049619 -02 17 28.245201716     14.1     F0I 67 0
4 HD 56126 pA* 07 16 10.2589670319 +09 59 47.953674864   9.20 8.32     F0/5Ia 301 0
5 IRAS 08143-4406 pA* 08 16 03.0216081249 -44 16 04.636233725           F8I 23 0
6 HD 108015 pA* 12 24 53.5038403586 -47 09 07.498401573   8.379 7.96     F3/5Ib/II 55 0
7 HD 172481 pA* 18 41 36.9594749880 -27 57 01.239866482   9.58 9.06     F2/3Ia 47 0
8 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 170 0
9 V* V448 Lac pA* 22 24 31.4284207830 +43 43 10.975183855 11.22 10.61 9.69     F7I 101 0
10 IRAS 23304+6147 pA? 23 32 44.7854376478 +62 03 49.083515796   15.52 13.15 11.79 10.50 C-rich 106 0

    Equat.    Gal    SGal    Ecl

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2020.01.21-03:08:37

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