THE PALOMAR TRANSIENT FACTORY and RR LYRAE: The METALLICITY-LIGHT CURVE RELATION BASED on AB-TYPE RR LYRAE in the KEPLER FIELD

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题名:	THE PALOMAR TRANSIENT FACTORY and RR LYRAE: The METALLICITY-LIGHT CURVE RELATION BASED on AB-TYPE RR LYRAE in the KEPLER FIELD
作者:	俞伯傑;Ngeow, Chow-Choong;Yu, Po-Chieh;Bellm, Eric;Yang, Ting-Chang;Chang, Chan-Kao;Miller, Adam;Laher, Russ;Surace, Jason;Ip, Wing-Huen
贡献者:	理學院天文研究所
关键词:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;DISTANCE;distance scale;METALLICITY;SKY;SPECTROSCOPY;stars: abundances;stars: variables: RR Lyrae;TELESCOPES;VARIABLE STARS
日期:	2016-12-01
上传时间:	2026-04-21 14:59:12 (UTC+8)
出版者:	IOP Publishing Ltd.;United States: The American Astronomical Society
摘要:	摘要： ABSTRACT The wide-field synoptic sky surveys, known as the Palomar Transient Factory (PTF) and the intermediate Palomar Transient Factory (iPTF), will accumulate a large number of known and new RR Lyrae. These RR Lyrae are good tracers to study the substructure of the Galactic halo if their distance, metallicity, and galactocentric velocity can be measured. Candidates of halo RR Lyrae can be identified from their distance and metallicity before requesting spectroscopic observations for confirmation. This is because both quantities can be obtained via their photometric light curves, because the absolute V-band magnitude for RR Lyrae is correlated with metallicity, and the metallicity can be estimated using a metallicity-light curve relation. To fully utilize the PTF and iPTF light-curve data in related future work, it is necessary to derive the metallicity-light curve relation in the native PTF/iPTF R-band photometric system. In this work, we derived such a relation using the known ab-type RR Lyrae located in the Kepler field, and it is found to be (where P is pulsational period and is one of the Fourier parameters describing the shape of the light curve), with a dispersion of 0.118 dex. We tested our metallicity-light curve relation with new spectroscopic observations of a few RR Lyrae in the Kepler field, as well as several data sets available in the literature. Our tests demonstrated that the derived metallicity-light curve relation could be used to estimate metallicities for the majority of the RR Lyrae, which are in agreement with the published values. 其他題名： APJS 其他題名： Astrophys. J. Suppl 出版者： United States: The American Astronomical Society 出版日期： 2016-12-01 出處： The Astrophysical journal. Supplement series, 2016-12, Vol.227 (2), p.30 資源來源： Alma/SFX Local Collection 版權： 2016. The American Astronomical Society. All rights reserved. 識別號： ISSN: 0067-0049 識別號： EISSN: 1538-4365 識別號： DOI: 10.3847/1538-4365/227/2/30
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