Observational evidence for a different initial mass function in the early galaxy

被引：74

作者：

Lucatello, S

Gratton, RG

Beers, TC

Carretta, E

机构：

[1] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[2] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[3] Michigan State Univ, Dept Phys, E Lansing, MI 48824 USA

[4] Michigan State Univ, JINA, E Lansing, MI 48824 USA

[5] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 625卷 / 02期

关键词：

binaries : general; Galaxy : fundamental parameters; Galaxy : stellar content; stars : AGB and post-AGB;

D O I：

10.1086/428105

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The unexpected high incidence of carbon-enhanced, s-process-enriched unevolved stars among extremely metal-poor stars in the halo provides a significant constraint on the initial mass function ( IMF) in the early Galaxy. We argue that these objects are evidence for the past existence of a large population of intermediate-mass stars and conclude that the IMF in the early Galaxy was different from the present one and shifted toward higher masses.

引用

页码：833 / 837

页数：5

共 46 条

[21] Evolutionary sequences of stellar models with new radiative opacities .6. Z=0.0001 [J].