Article (Scientific journals)
Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations
Skottfelt, J.; Bramich, D. M.; Figuera Jaimes, R. et al.
2015In Astronomy and Astrophysics, 573
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Keywords :
Globular clusters: individual; Instrumentation: high angular resolution; Stars: variables: general; Stars: variables: RR lyrae; Giant stars; Time series analysis; Difference images; Globular clusters; Hubble space telescopes; Instrumentation:high angular resolution; Red giant branches; Stars
Abstract :
[en] 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 difference 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 are W Virginis 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. © ESO 2015.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Skottfelt, J.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Bramich, D. M.;  Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar
Figuera Jaimes, R.;  European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching bei München, Germany, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Jørgensen, U. G.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Kains, N.;  European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching bei München, Germany, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States
Arellano Ferro, A.;  Instituto de Astronomía, Universidad Nacional Autónomade Mexico, Mexico, Mexico
Alsubai, K. A.;  Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar
Bozza, V.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Calchi Novati, S.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA, United States, Istituto Internazionale Per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy
Ciceri, S.;  Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
D'Ago, G.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Dominik, M.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Galianni, P.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Gu, S.-H.;  Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China
Harpsøe, K. B. W.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Haugbølle, T.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Hinse, T. C.;  Korea Astronomy and Space Science Institute, Daejeon, South Korea
Hundertmark, M.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Juncher, D.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Korhonen, H.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark, Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, Piikkiö, Finland
Liebig, C.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Mancini, L.;  Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
Popovas, A.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, København Ø, Denmark, Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, København K, Denmark
Rabus, M.;  Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany, Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vic͡a Mackenna 4860, Macul, Santiago, Chile
Rahvar, S.;  Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
Scarpetta, G.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy, NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA, United States
Schmidt, R. W.;  Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstr. 12-14, Heidelberg, Germany
Snodgrass, C.;  Planetary and Space Sciences, Department of Physical Sciences, Open University, Milton Keynes, United Kingdom, Max-Planck-Institute for Solar System Research, Justus-von-Liebig-Weg 3, Göttingen, Germany
Southworth, J.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Starkey, D.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, United Kingdom
Street, R. A.;  Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA, United States
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Wang, X.-B.;  Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China
Wertz, O.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, Bât. B5c, Liège, Belgium
More authors (24 more) Less
Language :
English
Title :
Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations
Publication date :
2015
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
573
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
DNRF - Danish National Research Foundation [DK]
NASA - National Aeronautics and Space Administration [US-DC] [US-DC]
NSCF - National Natural Science Foundation of China [CN]
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