Galactic halo age estimated from LAMOST DR4 and Gaia DR1

Galactic halo age estimated from LAMOST DR4 and

Gaia DR1

Jin-Cheng Guo;Zhi-Ying Huo;Chun Wang;Hua-Wei Zhang;Yang Huang;Xiao-Wei Liu;Ji-Feng Liu;Mao-Sheng Xiang;Bing-Qiu Chen;Hai-Bo Yuan;Zhi-Jia Tian

【期刊名称】《天文和天体物理学研究》 【年(卷),期】2019(019)001

【摘要】The stellar halo is one of the major components in the Milky Way.Research on its age can provide critical constraints on the origin of the stellar halo and further on the formation of our Galaxy.So far,different approaches and samples have been used to estimate the age of the Galactic halo.In our previous paper,we carefully selected 63 field halo turn-off stars within 1 kpc from the literature using a kinematic approach,then estimated the age of the halo.In this following work,we not only update the data from LAMOST DR4 and Gaia DR1,but also try a different method to select a clean halo sample by combining the metallicity and orbital parameters.Then we compare this halo turn-off sample with the GARSTEC model in theB-V vs.metallicity plane.After Monte Carlo simulations are performed,the age is estimated to be 10.5±1.4 Gyr,highly consistent with our previous result and other studies.However,due to the limited common sources between LAMOST DR4 and Gaia DR1,the final sample in this paper is still quite small.The estimated age will be more robust with the much larger Gaia DR2.

【总页数】8页(87-94) 【关键词】

【作者】Jin-Cheng Guo;Zhi-Ying Huo;Chun Wang;Hua-Wei Zhang;Yang Huang;Xiao-Wei Liu;Ji-Feng Liu;Mao-Sheng Xiang;Bing-Qiu Chen;Hai-Bo Yuan;Zhi-Jia Tian

【作者单位】Department of Astronomy, Peking University, Beijing 100871, China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;Department of Astronomy, Peking University, Beijing 100871, China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China;Department of Astronomy, Peking University, Beijing 100871, China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China;Department of Astronomy, Peking University, Beijing 100871, China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China;South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China;South-Western Institute for Astronomy

Research,

Yunnan

University,

Kunming

650500,

China;Department of Astronomy, Peking University, Beijing 100871,

China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China;Department of Astronomy, Beijing Normal University, Beijing 100875, China;Department of Astronomy, Peking University, Beijing 100871, China;Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China 【正文语种】英文 【中图分类】 【文献来源】

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