Article (Scientific journals)
Many new variable stars discovered in the core of the globular cluster NGC 6715 (M 54) with EMCCD observations
Figuera Jaimes, R.; Bramich, D. M.; Kains, N. et al.
2016In Astronomy and Astrophysics, 592
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Keywords :
Atmospheric effects; Globular clusters: individual: NGC 6715 (M 54); Instrumentation: high angular resolution; Methods: observational; Stars: variables: general; Stars: variables: RR Lyrae; Atmospheric turbulence; Photometry; Telescopes; Globular clusters: individual; Instrumentation:high angular resolution; Methods:observational; Stars
Abstract :
[en] Context. We show the benefits of using electron-multiplying CCDs and the shift-and-add technique as a tool to minimise the effects of atmospheric turbulence, such as blending between stars in crowded fields, and to avoid saturated stars in the fields observed. We intend to complete, or improve on, the census of the variable star population in globular cluster NGC 6715. Aims. Our aim is to obtain high-precision time-series photometry of the very crowded central region of this stellar system via the collection of better angular resolution images than has been previously achieved with conventional CCDs on ground-based telescopes. Methods. Observations were carried out using the Danish 1.54-m telescope at the ESO La Silla observatory in Chile. The telescope is equipped with an electron-multiplying CCD that enables short-exposure-time images to be obtained (ten images per second) that were stacked using the shift-and-add technique to produce the normal-exposure-time images (minutes). The high precision photometry was performed via difference image analysis employing the DanDIA pipeline. We attempted automatic detection of variable stars in the field. Results. We statistically analysed the light curves of 1405 stars in the crowded central region of NGC 6715 to automatically identify the variable stars present in this cluster. We found light curves for 17 previously known variable stars near the edges of our reference image (16 RR Lyrae and 1 semi-regular) and we discovered 67 new variables (30 RR Lyrae, 21 irregular (long-period type), 3 semi-regular, 1 W Virginis, 1 eclipsing binary, and 11 unclassified). Photometric measurements for these stars are available in electronic form through the Strasbourg Astronomical Data Centre. © 2016 ESO.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Figuera Jaimes, R.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St.Andrews, United Kingdom, European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching bei München, Germany
Bramich, D. M.;  Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar
Kains, N.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States
Skottfelt, J.;  Centre for Electronic Imaging, Dept. of Physical Sciences, Open University, Milton Keynes, United Kingdom, Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Jørgensen, U. G.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Horne, K.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St.Andrews, United Kingdom
Dominik, M.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St.Andrews, United Kingdom
Alsubai, K. A.;  Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar
Bozza, V.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano, Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Burgdorf, M. J.;  Meteorologisches Institut, Universität Hamburg, Bundesstraße 55, Hamburg, Germany
Calchi Novati, S.;  Dipartimento di Fisica E. R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano, 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, Italy
Ciceri, S.;  Department of Astronomy, Stockholm University, AlbaNova University Center, Stockholm, Sweden
D'Ago, G.;  Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare, Italy
Evans, D. F.;  Astrophysics Group, Keele University, Staffordshire, 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
W Harpsøe, K. B.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Haugbølle, T.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Hinse, T. C.;  Korea Astronomy and Space Science Institute, Daejeon, South Korea
Hundertmark, M.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St.Andrews, United Kingdom, Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Juncher, D.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Kerins, E.;  Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, United Kingdom
Korhonen, H.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark, Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Vaïsäläntie 20, Piikkiö, Finland, Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, Copenhagen Ø, Denmark
Kuffmeier, M.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen K, Denmark
Mancini, L.;  Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
Peixinho, N.;  Universidad de Antofagasta, Unidad de Astronomiá, Facultad Cs. Básicas, Av. U. de Antofagasta, Antofagasta, Chile, CITEUC-Centre for Earth and Space Science Research, University of Coimbra, Observatório Astronómico, Coimbra, Portugal
Popovas, A.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen 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. Vicunã 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, Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy, Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare, Italy
Schmidt, R. W.;  Astronomisches Rechen-Institut, Zentrum für Astronomie der 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, Goleta, CA, United States
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Tronsgaard, R.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, Denmark
Unda-Sanzana, E.;  Universidad de Antofagasta, Unidad de Astronomiá, Facultad Cs. Básicas, Av. U. de Antofagasta, Antofagasta, Chile
Von Essen, C.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, Denmark
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 Geóphysique, Université de Liège, Alleé du 6, Liège, Belgium
More authors (31 more) Less
Language :
English
Title :
Many new variable stars discovered in the core of the globular cluster NGC 6715 (M 54) with EMCCD observations
Publication date :
2016
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
592
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
2013-9-400-00; 2014-1-400-06; 2015-1-850-04
Funders :
KASI - Korea Astronomy and Space Science Institute [JP]
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