2005A&A...443.1029K


Query : 2005A&A...443.1029K

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 - 2022
#notes
1 HD 2665 PM* 00 30 45.4469338728 +57 03 53.628989292 8.66 8.51 7.72     G5IIIw 170 0
2 HD 2796 Pe* 00 31 16.9147531152 -16 47 40.790991624 9.58 9.28 8.50 8.14 8.67 Fw 186 0
3 HD 19445 PM* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 753 0
4 BD+37 1458 PM* 06 16 01.5222885381 +37 43 18.754343426 9.41 9.52 8.92 8.34 7.91 G0 131 0
5 HD 84937 PM* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 753 0
6 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 891 0
7 HD 187111 Pe* 19 48 39.5744746680 -12 07 19.738101036   8.92 7.75     G8wF8III/IV 136 0
8 HD 216143 Pe* 22 50 31.0883724288 -06 54 49.554279360   8.78 7.81 7.44   G2/3(IV)(we) 134 0
9 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     G2IV 274 0

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2022.06.27-05:19:41

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