Probing the Galactic Halo with RR Lyrae Stars.Ⅵ.The Radial Velocity Curve Templates of RRc Stars

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外文摘要：We present radial velocity(RV)curve templates of RR Lyrae first-overtone(RRc)stars constructed with the Mg Ⅰ b triplet and Hα lines using time-domain Medium-Resolution Survey spectra of seven RRc stars from Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)Data Release 9.Additionally,we derive the relation between the stellar RV curve amplitudes and g-band light curve amplitudes from Zwicky Transient Facility(ZTF)public survey.For those RRc stars without ZTF g-band light curves,we provide the conversions from the light curve amplitudes in ZTF r-and i-bands,Gaia G-band,and V-band from the All-Sky Automated Survey for Supemovae to those in ZTF g-band.We validate our RV curve templates using the RRc star SV Scl and find the uncertainties of systemic RV are less than 2.11 km s-1 and 6.08 km s-1 based on the Mg Ⅰ b triplet and Hα lines,respectively.We calculate the systemic RVs of 30 RRc stars using the RV curve templates constructed with the Mg Ⅰ b triplet and Hα lines and find the systemic RVs are comparable with each other.This RV curve template will be particularly useful for obtaining the systemic RV of RRc using the LAMOST spectroscopy.

外文关键词：

stars:variables:RR LyraeStarstechniques:radial velocities

作者：

Yue Huang、Min Fang、Gaochao Liu、Xianzhong Zheng、Sarah Ann Bird、Yang Huang、Jianrong Shi、Jiangtao Wang、Huawei Zhang、Haijun Tian、Haotong Zhang

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作者单位：

College of Science,China Three Gorges University,Yichang 443002,China

Center for Astronomy and Space Sciences,China Three Gorges University,Yichang 443002,China

Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

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

CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Beijing 100101,China

Department of Astronomy,School of Physics,Peking University,Beijing 100871,China

Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China

School of Sciences,Hangzhou Dianzi University,Hangzhou 310018,China

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基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)China Manned Space Project including the CSST Milky Way and Nearby Galaxies Survey on Dust and Extinction ProjectChina Manned Space Project including the CSST Milky Way and Nearby Galaxies Survey on Dust and Extinction ProjectHubei Provincial Natural Science FoundationKey Laboratory Fund of Ministry of EducationNational Natural Science Foundation of China(NSFC)National Major Scientific Project built by the Chinese Academy of SciencesNational Development and Reform CommissionNational Astronomical Observatories,Chinese Academy of Sciences

项目编号：

2023YFA1608100120900441183300612303023CMS-CSST-2021-A09CMS-CSST-2021-A082023AFB577QLPL2022P01U1731108

出版年：

2024

DOI：

10.1088/1674-4527/ad50b5

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(7)