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

Query : 1998A&A...337..216Z

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 - 2024 		#notes
1 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.338 12.221 11.704 11.321 CEMP-s 90 0
2 SB 960 Pe* 00 44 03.5698629048 -13 55 26.268999384   12.69 12.15 11.806 11.483 CEMP-s 110 0
3 HD 36126 Pu* 05 28 09.0502877976 -31 38 44.506842972   9.79 9.52     F0V 7 0
4 IRAS 05341+0852 pA* 05 36 55.0511076432 +08 54 08.656315452   15.37 13.45 12.95 11.43 F5I 120 0
5 LP 625-44 Pe* 16 43 14.0377103880 -01 55 30.411443424   12.84 11.68     CEMP-s 106 0
6 V* V340 Ser RV* 17 30 46.9248358536 -11 22 08.313569004   10.51 9.68     F2/3II 36 0
7 HD 187216 Pe* 19 24 18.3437183760 +85 21 57.189325176   11.2 9.56     C3,3_CH5: 74 2
8 HD 187885 pA* 19 52 52.7033593752 -17 01 50.289441096   9.25 8.68 8.32   F2/6Ia 179 0
9 HD 196944 SB* 20 40 46.0815001992 -06 47 50.604476604   9.01 8.40 8.08   CEMP-rs 101 0
10 HE 2134-3940 Pe* 21 37 45.7673945880 -39 27 22.313379600   13.790 12.660 12.160 11.760 KIIvw 85 0
11 * nu. Ind ** 22 24 36.8853892493 -72 15 19.488237466   5.94 5.29     G9VFe-3.1CH-1.5 276 0

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