Two-component model for the chemical evolution of the Galactic disk

	Two-component model for the chemical evolution of the Galactic disk
	Chang, RX ; Hou, JL ; Shu, CG ; Fu, CQ
刊名	ASTRONOMY & ASTROPHYSICS
	1999-10-01
卷号	350 期号:1 页码:38-48
关键词	galaxy : abundances galaxy : evolution galaxy : formation galaxy : structure
英文摘要	In the present paper, we introduce a two-component model of the Galactic disk to investigate its chemical evolution. It is assumed that the formation of the thick and thin disks occurs in two main accretion episodes with both infall rates being Gaussian. Both the pre-thin and post-thin scenarios for the formation of the thick disk are considered. The best fit is obtained through chi(2)-test between the models and the new observed metallicity distribution function of G dwarfs in the solar neighbourhood (Hou et al. 1998). Our results show that, the predictions of both the pre-thin and post-thin model agree well with the new observed G-dwarf metallicity distribution, i.e., it is difficult to conclude which one is better when based on current observational constraints. However, the present-day local density of the thick disk, required for the pre-thin model to get the best fit, is larger than most of results from star counts, yet this disagreement does not exist for the post-thin model. From this point of view, it would seem that the post-thin model is more viable. Finally, other comparisons between model predictions and observations are given.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	H-II REGIONS ; AGE-METALLICITY RELATION ; INTERMEDIATE-MASS STARS ; MILKY-WAY GALAXY ; SOLAR NEIGHBORHOOD ; ABUNDANCE GRADIENTS ; THICK DISK ; G-DWARF ; LATITUDE FIELDS ; FAINT STARS
收录类别	SCI
语种	英语
WOS记录号	WOS:000083288000010
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/28258]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, United Lab Opt Astron, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Chang, RX,Hou, JL,Shu, CG,et al. Two-component model for the chemical evolution of the Galactic disk[J]. ASTRONOMY & ASTROPHYSICS,1999,350(1):38-48.
APA	Chang, RX,Hou, JL,Shu, CG,&Fu, CQ.(1999).Two-component model for the chemical evolution of the Galactic disk.ASTRONOMY & ASTROPHYSICS,350(1),38-48.
MLA	Chang, RX,et al."Two-component model for the chemical evolution of the Galactic disk".ASTRONOMY & ASTROPHYSICS 350.1(1999):38-48.