2012A&A...541A..48L


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.13CEST04:57:37

2012A&A...541A..48L - Astronomy and Astrophysics, volume 541A, 48-48 (2012/5-1)

Abundances of neutron-capture elements in G24-25. A halo-population CH subgiant.

LIU S., NISSEN P.E., SCHUSTER W.J., ZHAO G., CHEN Y.Q. and LIANG Y.C.

Abstract (from CDS):

The differences between the neutron-capture element abundances of halo stars are important to our understanding of the nucleosynthesis of elements heavier than the iron group. We present a detailed abundance analysis of carbon and twelve neutron-capture elements from Sr up to Pb for a peculiar halo star G24-25 with [Fe/H]=-1.4 in order to probe its origin. The equivalent widths of unblended lines are measured from high resolution NOT/FIES spectra and used to derive abundances based on Kurucz model atmospheres. In the case of CH, Pr, Eu, Gd, and Pb lines, the abundances are derived by fitting synthetic profiles to the observed spectra. Abundance analyses are performed both relative to the Sun and to a normal halo star G16-20 that has similar stellar parameters as G24-25. We find that G24-25 is a halo subgiant star with an unseen component. It has large overabundances of carbon and heavy s-process elements and mild overabundances of Eu and light s-process elements. This abundance distribution is consistent with that of a typical CH giant. The abundance pattern can be explained by mass transfer from a former asymptotic giant branch component, which is now a white dwarf.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: chemically peculiar - nuclear reactions, nucleosynthesis, abundances

Simbad objects: 18

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Number of rows : 18

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 HD 224959 Pe* 00 02 08.0224361239 -02 49 12.239963584   10.6 9.55     C1,1_CH4 91 0
2 HD 26 Pe* 00 05 22.2077761394 +08 47 16.096990670 9.80 9.29 8.25 7.49 7.03 C-H1.5 166 0
3 HE 0024-2523 Pe* 00 27 27.6485410349 -25 06 28.291081599 15.067 15.32 14.91     CEMP-s 66 0
4 HD 55496 Pe* 07 12 11.3777515932 -22 59 00.610613637   9.30 8.40     G(II)wp(Ba) 67 1
5 BD+04 2466 PM* 11 26 49.1890409114 +03 51 51.646284678   11.22 10.67 10.45   KIIvw 70 0
6 V* TZ Crv LP* 12 00 57.2663387395 -21 15 02.778916850 10.82 9.55 8.14     G6/8IIICNII 38 0
7 BD+03 2688 PM* 12 44 07.7482993341 +02 44 37.938646350   11.60 10.55     M0 13 0
8 Wolf 615 PM* 15 58 18.6155308260 +02 03 06.102367973   11.41   10.3   ~ 32 0
9 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 103 0
10 HD 187861 Pe* 19 56 26.9429735087 -65 22 08.017100343   10.42 9.18     C1,1p_CH 59 0
11 HD 189711 Pe* 20 01 03.7891766338 +09 30 51.154617612 12.71 10.43 8.37 7.02 5.96 C4,3_CH3:_Ba5 67 0
12 BPS CS 22964-0161 SB* 20 03 25.5362187973 -38 38 35.324239028   14.9 14.41 14.63   CEMP-s 42 0
13 G 24-25 SB* 20 40 16.1061603541 +00 33 19.669357894       10.2   CEMP-s 43 0
14 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 93 0
15 HD 198269 Pe* 20 48 36.7373846083 +17 50 23.700525129   9.41 8.12     C-H3IV: 81 0
16 HD 206983 Pe* 21 46 09.3424956829 -15 14 39.768971268   11.1 9.45     GpBa 41 1
17 HE 2148-1247 Pe* 21 51 17.9099257554 -12 33 41.560711332   15.2 14.79     CEMP-r/s 45 0
18 HD 209621 Pe* 22 04 25.1407342403 +21 03 09.003434369   10.41 8.86     C-H3III: 102 0

    Equat.    Gal    SGal    Ecl

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