EXPLAINING THE Sr AND Ba SCATTER IN EXTREMELY METAL-POOR STARS

被引：31

作者：

Aoki, W. ^{[1
]}

Suda, T. ^{[1
]}

Boyd, R. N. ^{[1
]}

Kajino, T. ^{[1
,2
]}

Famiano, M. A. ^{[1
,3
,4
]}

机构：

[1] Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[2] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[3] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA

[4] Western Michigan Univ, Joint Inst Nucl Astrophys, Kalamazoo, MI 49008 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 766卷 / 01期

基金：

美国国家科学基金会;

关键词：

black hole physics; equation of state; Galaxy: evolution; nuclear reactions; nucleosynthesis; abundances; stars: Population II; GALACTIC CHEMICAL EVOLUTION; AGB STARS; MILKY-WAY; ELEMENTS; SIMULATIONS; ABUNDANCES; EQUATION; STATE;

D O I：

10.1088/2041-8205/766/1/L13

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Compilations of abundances of strontium and barium in extremely metal-poor stars show that an apparent cutoff is observed for [Sr/Ba] at [Fe/H] < -3.6 and large fluctuations for [Fe/H] > -3.6 with a clear upper bound depending on metallicity. We study the factors that place upper limits on the logarithmic ratio [Sr/Ba]. A model is developed in which the collapses of type II supernovae are found to reproduce many of the features seen in the data. This model is consistent with galactic chemical evolution constraints of light-element enrichment in metal-poor stars. Effects of turbulence in an explosive site have also been simulated, and are found to be important in explaining the large scatter observed in the [Sr/Ba] data.

引用

页数：5

共 24 条

[11] A GENERALIZED EQUATION OF STATE FOR HOT, DENSE MATTER [J].

LATTIMER, JM ;

SWESTY, FD .

NUCLEAR PHYSICS A, 1991, 535 (02) :331-376

[12] CS 30322-023: an ultra metal-poor TP-AGB star? [J].

Masseron, T. ;

Van Eck, S. ;

Famaey, B. ;

Goriely, S. ;

Plez, B. ;

Siess, L. ;

Beers, T. C. ;

Primas, F. ;

Jorissen, A. .

ASTRONOMY & ASTROPHYSICS, 2006, 455 (03) :1059-1072

[13] Oxygen and Light-Element Synthesis by Neutron-Capture Reactions in Metal-Free and Extremely Metal-Poor AGB Stars [J].

Nishimura, Takanori ;

Aikawa, Masayuki ;

Suda, Takuma ;

Fujimoto, Masayuki Y. .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2009, 61 (05) :909-929

[14] What are these blue metal-poor stars? [J].

Preston, GW ;

Sneden, C .

ASTRONOMICAL JOURNAL, 2000, 120 (02) :1014-1055

[15] ABUNDANCES OF Sr, Y, AND Zr IN METAL-POOR STARS AND IMPLICATIONS FOR CHEMICAL EVOLUTION IN THE EARLY GALAXY [J].

Qian, Y. -Z. ;

Wasserburg, G. J. .

ASTROPHYSICAL JOURNAL, 2008, 687 (01) :272-286

[16] Simulations of galactic chemical evolution: Ba enrichment [J].

Raiteri, CM ;

Villata, M ;

Gallino, R ;

Busso, M ;

Cravanzola, A .

ASTROPHYSICAL JOURNAL, 1999, 518 (02) :L91-L94

[17] THE EQUATION OF STATE FROM OBSERVED MASSES AND RADII OF NEUTRON STARS [J].

Steiner, Andrew W. ;

Lattimer, James M. ;

Brown, Edward F. .

ASTROPHYSICAL JOURNAL, 2010, 722 (01) :33-54

[18] Is HE 0107-5240 a primordial star? The characteristics of extremely metal-poor carbon-rich stars [J].

Suda, T ;

Aikawa, M ;

Machida, MN ;

Fujimoto, MY ;

Iben, I .

ASTROPHYSICAL JOURNAL, 2004, 611 (01) :476-493

[19] GALACTIC CHEMICAL EVOLUTION - HYDROGEN THROUGH ZINC [J].

TIMMES, FX ;

WOOSLEY, SE ;

WEAVER, TA .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1995, 98 (02) :617-658

[20]

Travaglio C., 2004, APJ, V601, P684

← 1 2 3 →