The link between chemical anomalies along the red giant branch and the horizontal branch extension in globular clusters

被引：39

作者：

Carretta, Eugenio ^{[1
]}

Recio-Blanco, Alejandra ^{[2
]}

Gratton, Raffaele G. ^{[3
]}

Piotto, Giampaolo ^{[4
]}

Bragaglia, Angela ^{[1
]}

机构：

[1] Osservatorio Astron Bologna, INAF, Via Ranzani 1, I-40127 Bologna, Italy

[2] Observ Cote Azur, CNRS, UMR 6202, Dept Cassiopee, F-06304 Nice 4, France

[3] Osservatorio Padova, INAF, I-35122 Padua, Italy

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2007年 / 671卷 / 02期

关键词：

globular clusters : general; stars : abundances; stars : evolution;

D O I：

10.1086/525021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find a strong correlation between the extension of the Na-O anticorrelation observed in red giant branch (RGB) stars and the high-temperature extension of the horizontal branch (HB) blue tail of Galactic globular clusters (GCs). The longer is the O-depleted tail of the Na-O anticorrelation observed in the RGB stars, the higher the maximum temperature reached by the bluest HB stars in the GC. This result provides clear, empirical evidence of a link between the extension of the HB and the presence of star-to-star abundance variations of proton-capture elements in GC stars. We discuss the possible interpretation of this correlation.

引用

页码：L125 / L128

页数：4

共 33 条

[1]

[Anonymous], 1993, Visualizing Data

[2] ω Centauri:: The population puzzle goes deeper [J].

Bedin, LR ;

Piotto, G ;

Anderson, J ;

Cassisi, S ;

King, IR ;

Momany, Y ;

Carraro, G .

ASTROPHYSICAL JOURNAL, 2004, 605 (02) :L125-L128

[3]

BIDIN MC, 2007, ASTRON ASTROPHYS, V474, P505

[4] Na-O anticorrelation and horizontal branches - II. The Na-O anticorrelation in the globular cluster NGC 6752 [J].

Carretta, E. ;

Bragaglia, A. ;

Gratton, R. G. ;

Lucatello, S. ;

Momany, Y. .

ASTRONOMY & ASTROPHYSICS, 2007, 464 (03) :927-937

[5] Na-O anticorrelation and horizontal branches -: IV.: Detection of He-rich and He-poor stellar populations in the globular cluster NGC 6218 [J].

Carretta, E. ;

Bragaglia, A. ;

Gratton, R. G. ;

Catanzaro, G. ;

Leone, F. ;

Sabbi, E. ;

Cassisi, S. ;

Claudi, R. ;

D'Antona, F. ;

Francois, P. ;

James, G. ;

Piotto, G. .

ASTRONOMY & ASTROPHYSICS, 2007, 464 (03) :939-951

[6] Na-O anticorrelation and HB I. The Na-O anticorrelation in NGC 2808 [J].

Carretta, E ;

Bragaglia, A ;

Gratton, RG ;

Leone, F ;

Recio-Blanco, A ;

Lucatello, S .

ASTRONOMY & ASTROPHYSICS, 2006, 450 (02) :523-U21

[7] Abundances in red giant stars of NGC 2808 and correlations between chemical anomalies and global parameters in globular clusters [J].

Carretta, E .

ASTRONOMICAL JOURNAL, 2006, 131 (03) :1766-1783

[8] Abundances of C, N, O in slightly evolved stars in the globular clusters NGC 6397, NGC 6752 and 47 Tuc [J].

Carretta, E ;

Gratton, RG ;

Lucatello, S ;

Bragaglia, A ;

Bonifacio, P .

ASTRONOMY & ASTROPHYSICS, 2005, 433 (02) :597-611

[9] Abundance analysis of turn-off and early subgiant stars in the globular cluster 47 Tuc (NGC 104) [J].

Carretta, E ;

Gratton, RG ;

Bragaglia, A ;

Bonifacio, P ;

Pasquini, L .

ASTRONOMY & ASTROPHYSICS, 2004, 416 (03) :925-940

[10] Galactic globular cluster stars: From theory to observation [J].

Cassisi, S ;

Castellani, V ;

Degl'Innocenti, S ;

Salaris, M ;

Weiss, A .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1999, 134 (01) :103-113

← 1 2 3 4 →