The variation of abundances in planetary nebulae with height above the Galactic plane

被引：0

作者：

Koppen, J

Cuisinier, F

机构：

[1] OBSERV STRASBOURG, URA 1280, EQUIPE EVOLUT GALACT, F-67000 STRASBOURG, FRANCE

[2] UNIV BASEL, ASTRON INST, CH-4102 BINNINGEN, SWITZERLAND

[3] INT SPACE UNIV, F-67400 ILLKIRCH GRAFFENSTADEN, FRANCE

来源：

ASTRONOMY & ASTROPHYSICS | 1997年 / 319卷 / 01期

关键词：

Galaxy: abundances; Galaxy: structure; Planetary nebulae: general; Galaxy: evolution;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a sample of 94 planetary nebulae of the Galactic disk we find a systematic decrease of the abundances of He, N, O, S, and Ar with height above the Galactic plane, and also with radial velocity. Over an interval of 3 kpc the abundance of O, S, and Ar decrease by 0.1 ... 0.2 dex. This value is in good agreement with the predictions of an empirical model for the chemical and kinematical evolution of the disk, based on relations and constraints of the solar neighbourhood. The radial migration of the progenitor stars, caused by the velocity dispersion increasing with age, is found to be quite important for the vertical metallicity profile.

引用

页码：98 / 108

页数：11