1998A&A...337..216Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.25CEST08:25:27

1998A&A...337..216Z - Astronomy and Astrophysics, volume 337, 216-222 (1998/9-1)

The chemical composition of HD 196944: a carbon and s-process rich, very metal-poor star.

ZACS L., NISSEN P.E. and SCHUSTER W.J.

Abstract (from CDS):

An LTE abundance analysis of the post-AGB candidate star HD 196944 is presented based on high resolution, high S/N spectra. The radial velocity of HD 196944 is found to be -174km/s indicating that it belongs to the halo population. The spectroscopic analysis provides the atmospheric parameters Teff=5250K, logg=1.7(cgs), ξt=1.9km/s corresponding to those for G2-5 (bright) giants. A low iron abundance, [Fe/H]=-2.45, is derived confirming the old, low mass nature of the star. With [C/Fe]=+1.4 and a mean s-process overabundance of [s/Fe]=+1.1 the peculiar atmospheric composition of HD 196944 is confirmed. Possible evolutionary stages of HD 196944, that can explain its atmospheric parameters and composition, are discussed.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: abundances - stars: chemically peculiar - stars: AGB and post-AGB - stars: individual: HD 196944

Simbad objects: 11

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Number of rows : 11

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 SKB 2 Pe* 00 41 39.8197261334 -26 18 54.463949137   13.338 12.221 11.704 11.321 C1,2 83 0
2 SB 960 Pe* 00 44 03.5698517387 -13 55 26.270588506   12.69 12.15 11.806 11.483 CEMP-s 102 0
3 HD 36126 * 05 28 09.0503866519 -31 38 44.507663762   9.79 9.52     F0V 3 0
4 IRAS 05341+0852 pA* 05 36 55.0500719686 +08 54 08.646055747   15.37 13.45 12.95 11.43 F6I 106 0
5 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 101 0
6 V* V340 Ser RV* 17 30 46.9250020324 -11 22 08.314111714   10.51 9.68     F2/3II 31 0
7 HD 187216 Pe* 19 24 18.3451130483 +85 21 57.185833557   11.2 9.56     C3,3_CH5: 67 2
8 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 170 0
9 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 86 0
10 HE 2134-3940 Pe* 21 37 45.7673672486 -39 27 22.314122762   13.790 12.660 12.160 11.760 KIIvw 81 0
11 * nu. Ind ** 22 24 36.8855638745 -72 15 19.494501994   5.94 5.29     G9VFe-3.1CH-1.5 246 0

    Equat.    Gal    SGal    Ecl

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2020.09.25-08:25:27

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