VI-band follow-up observations of ultra-long-period cepheid candidates in M31

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101428

Title:	VI-band follow-up observations of ultra-long-period cepheid candidates in M31
Authors:	饒兆聰;Ngeow, Chow-Choong;Lee, Chien-Hsiu;Yang, Michael Ting-Chang;Lin, Chi-Sheng;Hsiao, Hsiang-Yao;Cheng, Yu-Chi;Lin, Zhong-Yi;Lin, I-Ling;Kanbur, Shashi M.;Ip, Wing-Huen
Contributors:	理學院天文研究所
Keywords:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;BRIGHTNESS;Calibration;Cepheid variables;CEPHEIDS;COLOR;DISPERSIONS;DISTANCE;distance scale;Expansion;Factories;GALAXIES;galaxies: individual (M31);Industrial plants;Pulsation;PULSATIONS;stars: distances;stars: variables: Cepheids;TRANSIENTS;VISIBLE RADIATION
Date:	2015-02-01
Issue Date:	2026-04-21 14:33:36 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States: The American Astronomical Society
Abstract:	摘要： ABSTRACT The ultra-long-period Cepheids (ULPCs) are classical Cepheids with pulsation periods exceeding days. The intrinsic brightness of ULPCs are to mag brighter than their shorter period counterparts. This makes them attractive in future distance scale work to derive distances beyond the limit set by the shorter period Cepheids. We have initiated a program to search for ULPCs in M31, using the single-band data taken from the Palomar Transient Factory, and identified eight possible candidates. In this work, we presented the -band follow-up observations of these eight candidates. Based on our -band light curves of these candidates and their locations in the color-magnitude diagram and the Period-Wesenheit diagram, we verify two candidates as being truly ULPCs. The six other candidates are most likely other kinds of long-period variables. With the two confirmed M31 ULPCs, we tested the applicability of ULPCs in distance scale work by deriving the distance modulus of M31. It was found to be mag. The large error in the derived distance modulus, together with the large intrinsic dispersion of the Period-Wesenheit (PW) relation and the small number of ULPCs in a given host galaxy, means that the question of the suitability of ULPCs as standard candles is still open. Further work is needed to enlarge the sample of calibrating ULPCs and reduce the intrinsic dispersion of the PW relation before re-considering ULPCs as suitable distance indicators. 其他題名： AJ 其他題名： Astron. J 出版者： United States: The American Astronomical Society 出版日期： 2015-02-01 出處： The Astronomical journal, 2015-02, Vol.149 (2), p.66-13 資源來源： Institute of Physics Journals 版權： 2015. The American Astronomical Society. All rights reserved. 識別號： ISSN: 0004-6256 識別號： ISSN: 1538-3881 識別號： EISSN: 1538-3881 識別號： DOI: 10.1088/0004-6256/149/2/66
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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