Updated 24 μm period-luminosity relation derived from galactic cepheids

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题名:	Updated 24 μm period-luminosity relation derived from galactic cepheids
作者:	饒兆聰;Ngeow, Chow-Choong;Sarkar, Saurjya;Bhardwaj, Anupam;Kanbur, Shashi M.;Singh, Harinder P.
贡献者:	理學院天文研究所
关键词:	Calibration;Cepheid variables;Photometry;Pollution sources;Samples;Statistical analysis;Statistical methods
日期:	2015-11-01
上传时间:	2026-04-21 14:43:08 (UTC+8)
出版者:	IOP Publishing Ltd.
摘要:	摘要： In this work, we updated the catalog of Galactic Cepheids with 24 mu m photometry by cross-matching the positions of known Galactic Cepheids to the recently released MIPSGAL point source catalog. We have added 36 new sources featuring MIPSGAL photometry in our analysis, thus increasing the existing sample to 65. Six different sources of compiled Cepheid distances were used to establish a 24 mu m period-luminosity (P-L) relation. Our recommended 24 mu m P-L relation is M sub(24 mu m) = -3.18(+ or -0.10))log P - 2.46(+ or -0.10), with an estimated intrinsic dispersion of 0.20 mag, and is derived from 58 Cepheids exhibiting distances based on a calibrated Wesenheit function. The slopes of the P-L relations were steepest when tied solely to the 10 Cepheids exhibiting trigonometric parallaxes from the Hubble Space Telescope and Hipparcos. Statistical tests suggest that these P-L relations are significantly different from those associated with other methods of distance determination, and simulations indicate that difference may arise from the small sample size. 出版日期： 2015-11-01 出處： The Astrophysical journal, 2015-11, Vol.813 (1), p.57 資源來源： IoP Science journals 識別號： ISSN: 1538-4357 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/813/1/57
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