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

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Research in Astronomy and Astrophysics Pub Date : 2024-07-08 DOI:10.1088/1674-4527/ad50b5

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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引用次数: 0

Abstract

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 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 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.

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用天琴座 RR 星探测银河系光环。VI.RRc 恒星的径向速度曲线模板

我们利用大天区多天体光纤光谱望远镜（LAMOST）第9版数据中7颗RRc星的时域中分辨率巡天光谱，利用Mg i b三重谱线和Hα谱线构建了天琴座RRc星的径向速度（RV）曲线模板。此外，我们还推导出了恒星RV曲线振幅与Zwicky瞬变设施（ZTF）公开巡天中g波段光曲线振幅之间的关系。对于那些没有 ZTF g 波段光曲线的 RRc 恒星，我们提供了从 ZTF r 波段和 i 波段、Gaia G 波段以及来自全天空超新星自动巡天的 V 波段光曲线振幅到 ZTF g 波段光曲线振幅的转换。我们利用 RRc 星 SV Scl 验证了我们的 RV 曲线模板，发现基于 Mg i b 三重线和 Hα 线的系统 RV 不确定性分别小于 2.11 km s -1 和 6.08 km s -1 。我们利用用 Mg i b 三重线和 Hα 线构建的 RV 曲线模板计算了 30 颗 RRc 星的系统 RV，发现它们的系统 RV 相差无几。这种RV曲线模板对于利用LAMOST光谱获得RRc恒星的系统RV特别有用。

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来源期刊

Research in Astronomy and Astrophysics 地学天文-天文与天体物理

CiteScore

3.20

自引率

16.70%

发文量

2599

审稿时长

6.0 months

期刊介绍： Research in Astronomy and Astrophysics (RAA) is an international journal publishing original research papers and reviews across all branches of astronomy and astrophysics, with a particular interest in the following topics: -large-scale structure of universe formation and evolution of galaxies- high-energy and cataclysmic processes in astrophysics- formation and evolution of stars- astrogeodynamics- solar magnetic activity and heliogeospace environments- dynamics of celestial bodies in the solar system and artificial bodies- space observation and exploration- new astronomical techniques and methods