Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations

	Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations
	Skottfelt, J 1,2; Bramich, DM 3; Jaimes, RF 4,5; Jorgensen, UG 1,2; Kains, N 4,6; Ferro, AA 7; Alsubai, KA 3; Bozza, V 8,9; Novati, SC 8,10,11; Ciceri, S 12
刊名	ASTRONOMY & ASTROPHYSICS
	2015-01
卷号	573
关键词	globular clusters: individual stars: variables: RR Lyrae stars: variables: general instrumentation: high angular resolution
ISSN号	0004-6361
通讯作者	Skottfelt, J (reprint author), Univ Copenhagen, Niels Bohr Inst, Juliane Manes Vej 30, DK-2100 Copenhagen O, Denmark.
产权排序	第十三完成单位
英文摘要	Aims. In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal-rich ([Fe /H] > 1) globular clusters: NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. Methods. The observations were made with the electron-multiplying charge-couple device (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using di ff erence image analysis to obtain high-precision light curves of the variable stars. Results. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions of the five clusters. Furthermore, we were able to identify and, in most cases, classify 48, 49, 7, 8, and 2 previously unknown variables in NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652, respectively. Especially interesting is the case of NGC 6441, for which the variable star population of about 150 stars has been thoroughly examined by previous studies, including a Hubble Space Telescope study. In this paper we are able to present 49 new variable stars for this cluster, of which one (possibly two) are RR Lyrae stars, two areWVirginis stars, and the rest are long-period semi-regular or irregular variables on the red giant branch. We have also detected the first double-mode RR Lyrae in the cluster.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	RR-LYRAE STARS ; IMAGE-SUBTRACTION PHOTOMETRY ; COLOR-MAGNITUDE DIAGRAM ; X-RAY BINARIES ; NGC 6652 ; OPTICAL COUNTERPART ; CCD PHOTOMETRY ; NGC-6388 ; PARAMETERS ; NGC-6441
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2015/01/aa24967-14/aa24967-14.html
语种	英语
WOS记录号	WOS:000350806000038
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6812]
专题	云南天文台_系外行星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 København Ø, Denmark 2.Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5–7, 1350 København K, Denmark 3.Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar 4.European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany 5.SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, KY16 9SS, UK 6.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 7.Instituto de Astronomía Universidad Nacional Autónomade Mexico, 04510 Mexico, Mexico 8.Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno, via Giovanni Paolo II 132, 84084 - Fisciano (SA), Italy 9.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, 680126 Napoli, Italy 10.NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena CA 91125, USA
推荐引用方式 GB/T 7714	Skottfelt, J,Bramich, DM,Jaimes, RF,et al. Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations[J]. ASTRONOMY & ASTROPHYSICS,2015,573.
APA	Skottfelt, J.,Bramich, DM.,Jaimes, RF.,Jorgensen, UG.,Kains, N.,...&Wertz, O.(2015).Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations.ASTRONOMY & ASTROPHYSICS,573.
MLA	Skottfelt, J,et al."Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations".ASTRONOMY & ASTROPHYSICS 573(2015).