2005A&A...443.1029K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET05:03:20

2005A&A...443.1029K - Astronomy and Astrophysics, volume 443, 1029-1032 (2005/12-1)

Sulphur abundances in metal-poor stars.

KORN A.J. and RYDE N.

Abstract (from CDS):

We investigate the debated ``sulphur discrepancy'' found among metal-poor stars of the Galactic halo with [Fe/H]←2. This discrepancy stems in part from the use of two different sets of sulphur lines, the very weak triplet at 8694-95Å and the stronger triplet lines at 9212-9238Å. For three representative cases of metal-poor dwarf, turnoff and subgiant stars, we argue that the abundances from the λλ8694-95 lines have been overestimated which has led to a continually rising trend of [S/Fe] as metallicity decreases. Given that the near-IR region is subject to CCD fringing, these weak lines become excessively difficult to measure accurately in the metallicity regime of [Fe/H]←2. Based on homogeneously determined spectroscopic stellar parameters, we also present updated [S/Fe] ratios from the λλ9212-9238 lines which suggest a plateau-like behaviour similar to that seen for other alpha elements.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: Population II - Galaxy: abundances - Galaxy: evolution - Galaxy: halo

Simbad objects: 9

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Number of rows : 9

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 2665 PM* 00 30 45.4467882867 +57 03 53.626973228 8.66 8.51 7.72     G5IIIw 169 0
2 HD 2796 Pe* 00 31 16.9149599675 -16 47 40.792690842 9.58 9.28 8.50 8.14 8.67 Fw 182 0
3 HD 19445 PM* 03 08 25.5884 +26 19 51.400 8.29 8.52 8.06 7.60 7.27 G2VFe-3 745 0
4 BD+37 1458 PM* 06 16 01.5222776277 +37 43 18.756795213 9.41 9.52 8.92 8.34 7.91 G0 129 0
5 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 732 0
6 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 870 0
7 HD 187111 Pe* 19 48 39.5745673482 -12 07 19.741286114   8.92 7.75     G8wF8III/IV 133 0
8 HD 216143 Pe* 22 50 31.0884300128 -06 54 49.557528724   8.78 7.81 7.44   G2/3(IV)(we) 132 0
9 HD 221170 Pe* 23 29 28.8087923676 +30 25 57.847432750 9.43 8.74 7.66     G2IV 268 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-05:03:20

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