首页|On the Identification of N-rich Metal-poor Field Stars with Future Chinese Space Station Telescope

On the Identification of N-rich Metal-poor Field Stars with Future Chinese Space Station Telescope

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During the long term evolution of globular clusters(GCs),some member stars are lost to the field.The recently found nitrogen-rich(N-rich)metal-poor field stars are promising candidates of these GC escapees,since N enhancement is the fingerprint of chemically enhanced populations in GCs.In this work,we discuss the possibility of identifying N-rich metal-poor field stars with the upcoming Chinese Space Station Telescope(CSST).We focus on the main survey camera with NUV,u,g,r,i,z,y filters and slitless spectrograph with a resolution about 200.The combination of UV sensitive equipment and prominent N-related molecular lines in the UV band bodes well for the identification:the color-color diagram of(u-g)versus(g-r)is capable of separating N-rich field stars from normal halo stars,if metallicity can be estimated without using the information on u-band photometry.Besides,the synthetic spectra show that a signal-to-noise ratio of 10 is sufficient to identify N-rich field stars.In the near future,a large sample of N-rich field stars found by CSST,combined with state-of-the-art N-body simulations will be crucial to deciphering GC-Galaxy co-evolution.

stars:chemically peculiarstars:abundancestechniques:photometrictechniques:spectroscopic

Jiajun Zhang、Baitian Tang、Jiang Chang、Xiangxiang Xue、José G.Fernández-Trincado、Chengyuan Li、Long Wang、Hao Tian、Yang Huang

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School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China

CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area,Sun Yat-sen University,Zhuhai 519082,China

Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210034,China

Key Lab of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

Instituto de Astronomía,Universidad Católica del Norte,Av.Angamos 0610,Antofagasta,Chile

Key Lab of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

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China Manned Space ProjectChina Manned Space Project国家自然科学基金国家自然科学基金广东省自然科学基金Proyecto Fondecyt IniciaciónANID Concurso de Fomento a la Vinculación Internacional para Instituciones de Investigación Regionales(Modalidad corta duración)Joint Committee ESO-Government of Chile 2021Becas Santander Movilidad Internacional Profesores 2022,Banco Santander Chile国家自然科学基金onehundredtalent project of Sun Yatsen UniversityFundamental Research Funds for the Central Universities,Sun Yatsen University

CMS-CSST-2021-B03CMS-CSST-2021-A0812233013120730902022A151501073211220340FOVI210020ORP 023/202121BAA0061922hytd09

2024

10.1088/1674-4527/ad0428

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(1)
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