YNAO OpenIR  > 大样本恒星演化研究组
双星对早型星系化学演化和冷却函数的影响
Alternative TitleBinary Interactions on the Early-type Galaxy Chemical Evolution and Gas Cooling Function
王浪1,2,3,4
Source Publication天文学报(Acta Astronomica Sinica)
2018-01
Volume59Issue:01Pages:1-10
DOI10.15940/j.cnki.0001-5245.2018.01.004
ClassificationP152
Contribution Rank第1完成单位
Indexed ByCSCD ; 核心
Keyword星系:星际介质 星系:丰度 星系:演化
Abstract

通过星族合成方法发现:在星系参数拟合计算中,相比于单星星族,双星星族可以得到更大的年龄和更高的金属丰度,但双星如何影响星系演化仍不清楚.另外,对于早型星系存在的紫外超现象,目前存在两种主流的解释,一种是有年轻的星族形成,另一种是由双星星族中产生的高温天体引起,但具体哪一种形成机制仍不确定.计算了双星演化抛入星际介质的元素,结合星系化学演化模型和MAPPINGS III程序,研究了双星星族对早型星系气体冷却以及星系演化影响.结果显示,相比于单星演化,双星演化使得抛出的物质和金属丰度增加.另外,得到了早型星系紫外超两种机制下,抛入星际介质的各种元素丰度,发现一些元素的丰度比是不同的,这就意味着,这两种机制可以利用元素丰度比和平均金属丰度进一步认证.同时也计算了两种机制下星系的冷却函数,发现双星机制下的冷却更加有效. 

Other Abstract

Compared with the evolutionary population synthesis (EPS) models without binary interactions, the derived stellar age and metallicity of galaxies of the EPS models with binary interactions are larger. But, we do not know how the galaxies evolve if considering binary interactions in the galaxy evolution models. For early-type galaxies with the UV-upturn phenomenon, there are two explanations: recent star formation (RSF) and binary interactions. In this study, we obtain the mass return fraction and yields for stellar populations with and without binary interactions. In combination with the galaxy chemical and photoionization models, we study the effect of binary interactions on the chemical evolution of early-type galaxies, the metallicity evolution for the early-type galaxies with UV-upturn phenomenon under the two popular mechanisms. We find that the inclusion of binary interactions can raise the ejected mass, metallicity, alpha element, and accelerate the gas cooling. These can reasonably explain the conclusions made via the EPS models. Moreover, we find that the gas cooling is more efficient under the UV-upturn formation mechanism by binary interactions than RSF, and the ratios of metallicity are different for the two mechanisms, which can be further used to distinguish these two mechanisms.

Funding Project国家自然科学基金项目[11573062] ; 国家自然科学基金项目[115210001]
Funding Organization国家自然科学基金项目[11573062, 115210001]
Language中文
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
ISSN0001-5245
CSCD IDCSCD:6175579
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12081
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Affiliation1.中国科学院云南天文台,昆明,650011
2.中国科学院大学,北京,100049
3.中国科学院天体结构与演化重点实验室,昆明,650011
4.中国科学院天文大科学研究中心,北京,100012
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
王浪. 双星对早型星系化学演化和冷却函数的影响[J]. 天文学报(Acta Astronomica Sinica),2018,59(01):1-10.
APA 王浪.(2018).双星对早型星系化学演化和冷却函数的影响.天文学报(Acta Astronomica Sinica),59(01),1-10.
MLA 王浪."双星对早型星系化学演化和冷却函数的影响".天文学报(Acta Astronomica Sinica) 59.01(2018):1-10.
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