2000A&A...353..557H


Query : 2000A&A...353..557H

2000A&A...353..557H - Astronomy and Astrophysics, volume 353, 557-568 (2000/1-2)

Heavy-element abundances in the CH/CN-strong very metal-poor stars CS 22948-27 and CS 29497-34.

HILL V., BARBUY B., SPITE M., SPITE F., CAYREL R., PLEZ B., BEERS T.C., NORDSTROEM B. and NISSEN P.E.

Abstract (from CDS):

We have carried out a new analysis of the very metal-poor CH/CN strong stars CS 22948-27 and CS 29497-34. In particular, the effective temperatures were recomputed by comparing newly obtained photometric data to colours derived from model atmospheres computed especially for these stars. Metallicities of [Fe/H]=-2.45 and -2.90 are found, respectively, for CS 22948-27 and CS 29497-34. The abundances of heavy elements have been derived from newly obtained high-resolution spectroscopy in the blue spectral region, together with previously obtained spectra in the red, resulting in a total wavelength coverage of λλ 4000-8200Å. We find that the abundance patterns of our stars reflect enrichment by the r-process (as indicated by a high Eu abundance), as well as by the s-process, which could be due to a mass transfer episode from a companion crossing the AGB phase, although no clear evidence for binarity is indicated in the spectra obtained to date.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: general

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 - 2022
#notes
1 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.338 12.221 11.704 11.321 CEMP-s 88 0
2 SB 960 Pe* 00 44 03.5698629048 -13 55 26.268999384   12.69 12.15 11.806 11.483 CEMP-s 107 0
3 V* UV Cam C* 04 05 53.8499371056 +61 47 39.974061552   9.86 7.60     C-J4 97 0
4 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 796 0
5 LP 625-44 Pe* 16 43 14.0377103880 -01 55 30.411443424   12.84 11.68     CEMP-s 104 0
6 HD 187216 Pe* 19 24 18.3437183760 +85 21 57.189325176   11.2 9.56     C3,3_CH5: 70 2
7 HD 189711 Pe* 20 01 03.7894130088 +09 30 51.155058744 12.71 10.43 8.37 7.02 5.96 C4,3_CH3:_Ba5 68 0
8 HE 2134-3940 Pe* 21 37 45.7673945880 -39 27 22.313379600   13.790 12.660 12.160 11.760 KIIvw 84 0
9 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 427 0
10 HE 2356-0410 Pe* 23 59 13.1419841280 -03 53 48.220213560   14.39 13.60 13.164 12.713 CEMP-no 83 0

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2022.05.19-18:11:27

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