HIGH-RESOLUTION SPECTRA OF STARS IN GLOBULAR-CLUSTERS .6. OXYGEN-DEFICIENT RED GIANT STARS IN M13

被引：77

作者：

BROWN, JA ^{[1
]}

WALLERSTEIN, G ^{[1
]}

OKE, JB ^{[1
]}

机构：

[1] CALTECH,PALOMAR OBSERV,PASADENA,CA 91125

来源：

ASTRONOMICAL JOURNAL | 1991年 / 101卷 / 05期

关键词：

D O I：

10.1086/115798

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From high-resolution, high signal-to-noise spectra we have determined abundances of carbon, nitrogen, and oxygen and the C-12/C-13 ratio for five red giants in M13, including star II-67, which has previously been reported to be deficient in oxygen. Three of the five stars exhibit substantial oxygen deficiencies; [O/Fe] values range from +0.5 to less-than-or-equal-to -0.3. The sum of the CNO nuclides is the same for all stars, which we interpret as evidence that mixing of CNO-cycled material into the envelope is the cause of the variations in oxygen abundance.

引用

页码：1693 / 1698

页数：6

共 43 条

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