An equatorial ultra iron-poor star identified in BOSS

被引：31

作者：

Allende Prieto, C. ^{[1
,2
]}

Fernandez-Alvar, E. ^{[1
,2
]}

Aguado, D. S. ^{[1
,2
]}

Gonzalez Hernandez, J. I. ^{[1
,2
]}

Rebolo, R. ^{[1
,2
,3
]}

Lee, Y. S. ^{[4
]}

Beers, T. C. ^{[5
,6
]}

Rockosi, C. M. ^{[7
]}

Ge, J. ^{[8
]}

机构：

[1] Inst Astrofis Canarias, Tenerife 38205, Spain

[2] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[3] CSIC, Madrid, Spain

[4] Chungnam Natl Univ, Dept Astron & Space Sci, Taejon 305764, South Korea

[5] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[6] Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA

[7] Univ Calif Santa Cruz, UCO Lick Observ, Santa Cruz, CA 95064 USA

[8] Univ Florida, Dept Astron, Bryant Space Sci Ctr, Gainesville, FL 32611 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 579卷

基金：

美国安德鲁·梅隆基金会; 美国国家科学基金会;

关键词：

stars: abundances; stars: fundamental parameters; stars: Population III; Galaxy: formation; Galaxy: halo; DIGITAL SKY SURVEY; METAL-POOR; SPECTROSCOPIC SURVEY; DATA RELEASE; MILKY-WAY; EVOLUTION; CARBON; NUCLEOSYNTHESIS; FRAGMENTATION; UNIVERSE;

D O I：

10.1051/0004-6361/201525904

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of SDSS J131326.89 - 001941.4, an ultra iron-poor red giant star ([Fe/H] similar or equal to -4.3) with a very high carbon abundance ([C/Fe] similar or equal to +2.5). This object is the fifth star in this rare class, and the combination of a fairly low effective temperature (T-eff similar or equal to 5300 K), which enhances line absorption, with its brightness (g = 16.9), makes it possible to measure the abundances of calcium, carbon and iron using a low-resolution spectrum from the Sloan Digital Sky Survey. We examine the carbon and iron abundance ratios in this star and other similar objects in the light of predicted yields from metal-free massive stars, and conclude that they are consistent. By way of comparison, stars with similarly low iron abundances but lower carbon-to-iron ratios deviate from the theoretical predictions.

引用

页数：6

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