THE HOT END OF EVOLUTIONARY HORIZONTAL BRANCHES

被引：6

作者：

CASTELLANI, V

DEGL'INNOCENTI, S

PULONE, L

机构：

[1] UNIV FERRARA, DIPARTMENTO FIS, I-44100 FERRARA, ITALY

[2] IST NAZL FIS NUCL, I-44100 FERRARA, ITALY

[3] OSSERVATORIO ASTRON COLLURANIA, TERAMO, ITALY

[4] OSSERV ASTRON ROMA, I-00040 MONTE PORZIO CATO, ITALY

来源：

ASTROPHYSICAL JOURNAL | 1995年 / 446卷 / 01期

关键词：

GLOBULAR CLUSTERS; INDIVIDUAL; (NGC; 6752); HERTZSPRUNG-RUSSELL DIAGRAM; STARS; AGB AND POST-AGB; EVOLUTION; INTERIORS; POPULATION II;

D O I：

10.1086/175780

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we investigate the hot end of the horizontal branch (HE), presenting evolutionary constraints concerning the C-M diagram location and the gravity of hot HE stars. According to the adopted evolutionary scenario, we predict an upper limit for HE temperatures of about log T-e = 4.45, remarkably cooler than previous estimates. We find that such a theoretical prescription appears in good agreement with available observational data concerning both stellar temperatures and gravities. Finally, the problem of gaps in the HE distribution is discussed, suggesting that, at least in the case of the cluster NGC 6752, evolutionary gaps, a bimodal distribution of CNO, and stellar rotation should all play a negligible role.

引用

页码：228 / 233

页数：6

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