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

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 

机构地区：[1]College of Science,China Three Gorges University,Yichang 443002,China [2]Center for Astronomy and Space Sciences,China Three Gorges University,Yichang 443002,China [3]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [4]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [5]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China [6]CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Beijing 100101,China [7]Department of Astronomy,School of Physics,Peking University,Beijing 100871,China [8]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China [9]School of Sciences,Hangzhou Dianzi University,Hangzhou 310018,China

出　　处：《Research in Astronomy and Astrophysics》2024年第7期118-134,共17页天文和天体物理学研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(2023YFA1608100);the National Natural Science Foundation of China(NSFC,grant Nos.12090044,11833006 and 12303023);the science research grants from the China Manned Space Project including the CSST Milky Way and Nearby Galaxies Survey on Dust and Extinction Project CMS-CSST-2021-A09 and No.CMS-CSST-2021-A08.G.C.L;Hubei Provincial Natural Science Foundation with grant No.2023AFB577;the Key Laboratory Fund of Ministry of Education under grant No.QLPL2022P01;National Natural Science Foundation of China(NSFC,Grant No.U1731108)。

摘　　要：We present radial velocity(RV)curve templates of RR Lyrae first-overtone(RRc)stars constructed with the Mg I b triplet and Hαlines 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 Supernovae 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 Hαlines,respectively.We calculate the systemic RVs of 30 RRc stars using the RV curve templates constructed with the Mg I b triplet and Hαlines 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.

关 键 词：STARS VARIABLES RR Lyrae-Stars-techniques radial velocities 

分 类 号：P156[天文地球—天文学]