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A census of variability in globular cluster M 68 (NGC 4590)
Kains, N1,2; Ferro, AA3; Jaimes, RF2,4; Bramich, DM5; Skottfelt, J6,7; Jorgensen, UG6,7; Tsapras, Y8,9; Street, RA8; Browne, P4; Dominik, M4; Horne, K4; Hundertmark, M4; Ipatov, S10; Snodgrass, C11; Steele, IA12; Alsubai, KA10; Bozza, V13,14; Novati, SC13,15; Ciceri, S16; D'Ago, G13,14; Galianni, P4; Gu SH(顾盛宏)17,18; Harpsoe, K6,7; Hinse, TC6,19; Juncher, D6,7; Korhonen, H6,7,20; Mancini, L16; Popovas, A6,7; Rabus, M16,21; Rahvar, S22,23; Southworth, J24; Surdej, J25; Vilela, C24; Wang XB(王晓彬)17,18; Wertz, O25
Source PublicationASTRONOMY & ASTROPHYSICS
2015-06
Volume578
DOI10.1051/0004-6361/201424600
Contribution Rank第17完成单位
Indexed BySCI ; EI
KeywordStars: Variables: Rr Lyrae Stars: Variables: General Globular Clusters: Individual: m 68
Abstract

Aims. We analyse 20 nights of CCD observations in the V and I bands of the globular cluster M 68 (NGC 4590) and use them to detect variable objects. We also obtained electron-multiplying CCD (EMCCD) observations for this cluster in order to explore its core with unprecedented spatial resolution from the ground. 

Methods. We reduced our data using difference image analysis to achieve the best possible photometry in the crowded field of the cluster. In doing so, we show that when dealing with identical networked telescopes, a reference image from any telescope may be used to reduce data from any other telescope, which facilitates the analysis significantly. We then used our light curves to estimate the properties of the RR Lyrae (RRL) stars in M 68 through Fourier decomposition and empirical relations. The variable star properties then allowed us to derive the cluster's metallicity and distance. 

Results. M68 had 45 previously confirmed variables, including 42 RRL and 2 SX Phoenicis (SX Phe) stars. In this paper we determine new periods and search for new variables, especially in the core of the cluster where our method performs particularly well. We detect 4 additional SX Phe stars and confirm the variability of another star, bringing the total number of confirmed variable stars in this cluster to 50. We also used archival data stretching back to 1951 to derive period changes for some of the single-mode RRL stars, and analyse the significant number of double-mode RRL stars in M68. Furthermore, we find evidence for double-mode pulsation in one of the SX Phe stars in this cluster. Using the different classes of variables, we derived values for the metallicity of the cluster of [Fe/H] = -2.07 +/- 0.06 on the ZW scale, or -2.20 +/- 0.10 on the UVES scale, and found true distance moduli mu(0) = 15.00 +/- 0.11 mag (using RR0 stars), 15.00 +/- 0.05 mag (using RR1 stars), 14.97 +/- 0.11 mag (using SX Phe stars), and 15.00 +/- 0.07 mag (using the M-V-[Fe/H] relation for RRL stars), corresponding to physical distances of 10.00 +/- 0.49, 9.99 +/- 0.21, 9.84 +/- 0.50, and 10.00 +/- 0.30 kpc, respectively. Thanks to the first use of difference image analysis on time-series observations of M 68, we are now confident that we have a complete census of the RRL stars in this cluster.

Funding ProjectEuropean Community[229517] ; European Community[268421] ; DGAPA-UNAM[IN104612] ; NPRP from the Qatar National Research Fund (a member of Qatar Foundation)[X-019-1-006] ; NPRP from the Qatar National Research Fund (a member of Qatar Foundation)[NPRP-09-476-1-78] ; Communaute francaise de Belgique - Actions de recherche concertees - Academie universitaire Wallonie-Europe ; Korea Research Council for Fundamental Science and Technology (KRCF) ; KASI (Korea Astronomy and Space Science Institute)[2012-1-410-02] ; Danish Natural Science Foundation (FNU) ; National Natural Science Foundation of China[10373023] ; National Natural Science Foundation of China[10773027] ; Marie Curie Intra-European Fellowship ; FONDECYT[3120097]
Funding OrganizationEuropean Community[229517, 268421] ; DGAPA-UNAM[IN104612] ; NPRP from the Qatar National Research Fund (a member of Qatar Foundation)[X-019-1-006, NPRP-09-476-1-78] ; Communaute francaise de Belgique - Actions de recherche concertees - Academie universitaire Wallonie-Europe ; Korea Research Council for Fundamental Science and Technology (KRCF) ; KASI (Korea Astronomy and Space Science Institute)[2012-1-410-02] ; Danish Natural Science Foundation (FNU) ; National Natural Science Foundation of China[10373023, 10773027] ; Marie Curie Intra-European Fellowship ; FONDECYT[3120097]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000357502600140
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRR-LYRAE STARS ; LARGE-MAGELLANIC-CLOUD ; SX-PHOENICIS STARS ; HORIZONTAL-BRANCH STARS ; DIFFERENCE IMAGE-ANALYSIS ; TIME-SERIES PHOTOMETRY ; HUBBLE-SPACE-TELESCOPE ; VARIABLE-STARS ; METAL ABUNDANCES ; CCD PHOTOMETRY
EI Accession Number20152600968965
EI KeywordsStars
EI Classification Number657.2Extraterrestrial Physics and Stellar Phenomena - 723.2Data Processing and Image Processing - 922.2Mathematical Statistics
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6808
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorKains, N
Affiliation1.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
2.European Southern Observatory, Karl-Schwarzschild Straße 2, 85748 Garching bei München, Germany
3.Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, 04310 Coyoácan, Mexico
4.SUPA School of Physics & Astronomy, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK
5.Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar
6.Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100 Copenhagen, Denmark
7.Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, 1350 Copenhagen, Denmark
8.Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA
9.School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
10.Qatar Foundation, PO Box 5825, Doha, Qatar
11.Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
12.Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, Wirral., CH41 1LD, UK
13.Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, via Giovanni Paolo II 132, 84084 Fisciano, Italy
14.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy
15.Istituto Internazionale per gli Alti Studi Scientifici (IIASS), via Giuseppe Pellegrino, 19, 84019 Vietri Sul Mare Salerno, Italy
16.Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
17.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, PR China
18.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, PR China
19.Korea Astronomy and Space Science Institute, 305–348 Daejeon, Korea
20.Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
21.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago; 7820436, Chile
22.Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
23.Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo; ON; N2L 2Y5, Canada
24.Astrophysics Group, Keele University, Staffordshire; ST5 5BG, United Kingdom
25.Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Liège; 4000, Belgium
Recommended Citation
GB/T 7714
Kains, N,Ferro, AA,Jaimes, RF,et al. A census of variability in globular cluster M 68 (NGC 4590)[J]. ASTRONOMY & ASTROPHYSICS,2015,578.
APA Kains, N.,Ferro, AA.,Jaimes, RF.,Bramich, DM.,Skottfelt, J.,...&Wertz, O.(2015).A census of variability in globular cluster M 68 (NGC 4590).ASTRONOMY & ASTROPHYSICS,578.
MLA Kains, N,et al."A census of variability in globular cluster M 68 (NGC 4590)".ASTRONOMY & ASTROPHYSICS 578(2015).
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