FLUORINE ABUNDANCES IN GALACTIC ASYMPTOTIC GIANT BRANCH STARS

被引：70

作者：

Abia, C. ^{[1
]}

Cunha, K. ^{[2
]}

Cristallo, S. ^{[1
,3
]}

de Laverny, P.

Dominguez, I. ^{[1
]}

Eriksson, K. ^{[4
]}

Gialanella, L. ^{[5
]}

Hinkle, K. ^{[2
]}

Imbriani, G. ^{[6
]}

Recio-Blanco, A. ^{[3
]}

Smith, V. V. ^{[2
]}

Straniero, O. ^{[7
]}

Wahlin, R. ^{[4
]}

机构：

[1] Univ Granada, Dpto Fis Teor & Cosmos, E-18071 Granada, Spain

[2] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[3] Univ Nice Sophia Antipolis, CNRS, UMR 6202, Observ Cote Azur, F-06304 Nice, France

[4] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[5] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[6] Univ Naples Federico 2, Dipt Sci Fis, Naples, Italy

[7] INAF Osservatorio Collurania, I-64100 Teramo, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 715卷 / 02期

基金：

瑞典研究理事会;

关键词：

nuclear reactions; nucleosynthesis; abundances; stars: abundances; stars: AGB and post-AGB; stars: carbon; WOLF-RAYET STARS; CHEMICAL-COMPOSITION; CARBON STARS; AGB STARS; MODEL ATMOSPHERES; NUCLEOSYNTHESIS; F-19; OXYGEN;

D O I：

10.1088/2041-8205/715/2/L94

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An analysis of the fluorine abundance in Galactic asymptotic giant branch (AGB) carbon stars (24 N-type, 5 SC-type, and 5 J-type) is presented. This study uses the state-of-the-art carbon-rich atmosphere models and improved atomic and molecular line lists in the 2.3 mu m region. Significantly lower F abundances are obtained in comparison to previous studies in the literature. This difference is mainly due to molecular blends. In the case of carbon stars of SC-type, differences in the model atmospheres are also relevant. The new F enhancements are now in agreement with the most recent theoretical nucleosynthesis models in low-mass AGB stars, solving the long-standing problem of F in Galactic AGB stars. Nevertheless, some SC-type carbon stars still show larger F abundances than predicted by stellar models. The possibility that these stars are of larger mass is briefly discussed.

引用

页码：L94 / L98

页数：5

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