Abundances of volatile elements in post-AGB candidates

被引：16

作者：

Takeda, Yoichi ^{[1
]}

Taguchi, Hikaru ^{[2
,3
]}

Yoshioka, Kazuo ^{[3
]}

Hashimoto, Osamu ^{[2
]}

Aikawa, Toshiki ^{[4
]}

Kawanomoto, Satoshi ^{[1
]}

机构：

[1] Natl Astron Observ, Tokyo 1818588, Japan

[2] Gunma Astron Observ, Takayama, Gunma 3770702, Japan

[3] Univ Air, Gunma Study Ctr, Gunma 3710032, Japan

[4] Tohoku Gakuin Univ, Izumi Ku, Sendai, Miyagi 9813193, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2007年 / 59卷 / 06期

关键词：

stars : abundances; stars : AGB and post-AGB; stars : atmospheres; stars : evolution; stars; individual; (HD; 112374; HD; 148743; 161796; 163506; 187203);

D O I：

10.1093/pasj/59.6.1127

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A detailed non-LTE study on the abundances of C, N, O, S, and Zn was carried out for five F-G supergiants of suspected post-AGB candidates with IR excesses (HD 112374, HD 148743, HD 161796, HD 163506, and HD 187203), since these volatile elements can provide the key to inferring the original metallicity as well as an evolution-induced change due to mixing, given that they are free from depletion caused by dust-gas separation. The extent of separation-induced depletion in Fe, estimated by comparing with Zn, turned out to be rather moderate (less than or similar to several tenths dex). The characteristics of the C, N, and O abundances do not appear to be very different from the case of the first dredge-up in normal supergiants (decreased C and enriched N due to the first dredge-up); thus, the specific anomaly related to an advanced post-AGB stage so far reported (such as elevated C and O) could not be clearly confirmed.

引用

页码：1127 / 1140

页数：14

共 50 条

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