Lithium and metal abundances in long period Am binaries

被引：14
作者：
Iliev, IK
Budaj, J [1 ]
Zverko, J
Barzova, IS
Ziznovsky, J
机构：
[1] Slovak Acad Sci, Astron Inst, Tatranska Lomnic 05960, Slovakia
[2] Natl Astron Observ, Inst Astron, BG-4700 Smolyan, Bulgaria
来源：
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1998年 / 128卷 / 03期
关键词：
stars; chemically peculiar; abundances; individual; HD; 108651; 116657; KD; 138213; binaries; general;
D O I：
10.1051/aas:1998160
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
High signal-to-noise CCD spectra of three bright, long period Am binaries (HD 108651, HD 116657 and HD 138213) have been obtained and the atmospheric abundances of identified chemical elements were studied. We found HD 116657 to be a new candidate as a Li deficient, long period Am binary, in addition to 16 Ori. While HD 108651 and HD 116657 have pronounced Am characteristics, HD 138213 is just a mild Am star. These stars were further studied in a more general context related to the role of binarity in CP phenomenon. It was found that both Li abundance and the equivalent with ratio Ca I 6718/Fe I 6679 are more peculiar in systems with more pronounced eccentricities. Such behaviour is the opposite of what was previously found in Ap binaries and their anomalies. It indicates that tidal effects are of crucial importance in driving CP phenomena.
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页码：497 / 505
页数：9
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