The normal chemistry of multiple stellar populations in the dense globular cluster NGC 6093 (M 80)

被引:49
|
作者
Carretta, E. [1 ]
Bragaglia, A. [1 ]
Gratton, R. G. [2 ]
D'Orazi, V. [2 ,3 ,4 ]
Lucatello, S. [2 ]
Sollima, A. [1 ]
Momany, Y. [2 ,5 ]
Catanzaro, G. [6 ]
Leone, F. [7 ]
机构
[1] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy
[2] INAF Osservatorio Astron Padova, I-35122 Padua, Italy
[3] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
[4] Monash Univ, Monash Ctr Astrophys, Sch Math Sci, Melbourne, Vic 3800, Australia
[5] European So Observ, Santiago, Chile
[6] INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy
[7] Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy
来源
ASTRONOMY & ASTROPHYSICS | 2015年 / 578卷
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
stars: abundances; stars: Population II; globular clusters: general; globular clusters: individual: NGC 6093 (M 80); stars: atmospheres; NA-O ANTICORRELATION; RED GIANT BRANCH; METAL-POOR STARS; MAIN-SEQUENCE TURNOFF; BLUE STRAGGLER STARS; HORIZONTAL-BRANCH; NEUTRON-CAPTURE; ACS SURVEY; S-PROCESS; CHEMICAL INHOMOGENEITY;
D O I
10.1051/0004-6361/201525951
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the abundance analysis of 82 red giant branch stars in the dense, metal-poor globular cluster NGC 6093 (M 80), the largest sample of stars analysed in this way for this cluster. From high-resolution UVES spectra of 14 stars and intermediate resolution GIRAFFE spectra for the other stars we derived abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu. On our UVES metallicity scale the mean metal abundance of M 80 is [Fe/H] = -1.791 +/- 0.006 +/- 0.076 (+/- statistical +/- systematic error) with sigma = 0.023 (14 stars). M 80 shows star-to-star variations in proton-capture elements, and the extension of the Na-O anti-correlation perfectly fit the relations with (i) total cluster mass; (ii) horizontal branch morphology; and (iii) cluster concentration previously found by our group. The chemistry of multiple stellar populations in M80 does not look extreme. The cluster is also a representative of halo globular clusters concerning the pattern of a-capture and Fe-group elements. However we found that a significant contribution from the s-process is required to account for the distribution of neutron-capture elements. A minority of stars in M 80 seem to exhibit slightly enhanced abundances of s-process species, compatible with those observed in M 22 and NGC 1851, although further confirmation from larger samples is required.
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页数:17
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