CUMULATIVE OXYGEN ABUNDANCES OF SPIRAL GALAXIES

被引：1
|
作者：
Dack, Stuart [1 ]
McCall, Marshall L. [1 ]
机构：
[1] York Univ, Dept Phys & Astron, Toronto, ON M3J 1P3, Canada
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 750卷 / 02期
基金：
加拿大自然科学与工程研究理事会;
关键词：
galaxies: abundances; galaxies: evolution; galaxies: spiral; H II regions; H-II REGIONS; PRIMORDIAL HELIUM ABUNDANCE; HII-REGIONS; MOLECULAR GAS; STAR-FORMATION; COMPOSITION GRADIENTS; CHEMICAL ABUNDANCES; RADIAL-DISTRIBUTION; STARBURST GALAXIES; SOUTHERN GALAXIES;
D O I：
10.1088/0004-637X/750/2/167
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Studying the global evolution of spiral galaxies requires determining their overall chemical compositions. However, since spirals tend to possess gradients in their chemical compositions, determining their overall chemical abundances poses a challenge. In this study, the framework for a newly proposed method for determining the overall oxygen abundance of a disk is established. By separately integrating the absolute amounts of hydrogen and oxygen out to large radii, the cumulative oxygen abundance is shown to approach an asymptotic value. In this manner, a reliable account of the overall chemical state of a disk is revealed.
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页数：14
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