On the perils of hyperfine splitting: A reanalysis of Mn and Sc abundance trends

被引：105

作者：

Prochaska, JX ^{[1
]}

McWilliam, A ^{[1
]}

机构：

[1] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 537卷 / 01期

基金：

美国国家科学基金会;

关键词：

Galaxy : abundances; nuclear reactions; nucleosynthesis; abundances; stars : abundances;

D O I：

10.1086/312749

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the impact of hyperfine splitting on stellar abundance analyses of Mn and Sc and find that incorrect hyperfine splitting treatment can lead to spurious abundance trends with metallicity. We estimate corrections to a recent study by Nissen et al. and find (1) [Mn/Fe] is described by a bimodal distribution, with Mn/Fe] similar to -0.3 for stars with [Fe/H] < -0.7 and [Mn/Fe] similar to -0.05 for stars at higher metallicity, suggestive of a transition between halo/thick-disk and thin-disk populations, and (2) the large majority of stars show nearly solar [Sc/Fe] ratios, although important deviations cannot be ruled out.

引用

页码：L57 / L60

页数：4

共 31 条

[1] GALACTIC EVOLUTION AND NUCLEOSYNTHESIS [J].

ARNETT, WD .

ASTROPHYSICAL JOURNAL, 1971, 166 (01) :153-&

[2]

BIEHL D, 1976, THESIS KIEL U KIEL

[3] HYPERFINE-STRUCTURE MEASUREMENTS FOR LINES OF ASTROPHYSICAL INTEREST IN MN-I [J].

BOOTH, AJ ;

SHALLIS, MJ ;

WELLS, M .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1983, 205 (01) :191-205

[4]

CONDON EU, 1935, THEORY ATOMIC SPECTR, P238

[5] NEUTRAL OXYGEN IN LATE-TYPE STARS [J].

CONTI, PS ;

GREENSTEIN, JL ;

SPINARD, H ;

WALLERSTEIN, G ;

VARDYA, MS .

ASTROPHYSICAL JOURNAL, 1967, 148 (1P1) :105-+

[6] CHEMICAL EVOLUTION WITH BURSTS OF STAR FORMATION - ELEMENT RATIOS IN DWARF GALAXIES [J].

GILMORE, G ;

WYSE, RFG .

ASTROPHYSICAL JOURNAL, 1991, 367 (02) :L55-L58

[7]

GRATTON RG, 1991, ASTRON ASTROPHYS, V241, P501

[8]

GRATTON RG, 1989, ASTRON ASTROPHYS, V208, P171

[9] HYPERFINE SPLITTING OF 3D54S4P LEVELS OF MN-I AND QUADRUPOLE MOMENT OF 55MN [J].

HANDRICH, E ;

STEUDEL, A ;

WALTHER, H .

PHYSICS LETTERS A, 1969, A 29 (08) :486-&

[10] ABUNDANCES IN SOME POPULATION-II K-GIANTS [J].

HELFER, HL ;

WALLERSTEIN, G ;

GREENSTEIN, JL .

ASTROPHYSICAL JOURNAL, 1959, 129 (03) :700-&

← 1 2 3 4 →