globular clusters: individual: NGC 6981; stars: variables: RR Lyrae; instrumentation: high angular resolution; stars: variables: general
Abstract :
[en] Two previously unknown variable stars in the crowded central region of the globular cluster NGC 6981 are presented. The observations were made using the electron multiplying CCD (EMCCD) camera at the Danish 1.54 m Telescope at La Silla, Chile. The two variableswere not previously detected by conventional CCD imaging because of their proximity to a bright star. This discovery demonstrates that EMCCDs are a powerful tool for performing high-precision time-series photometry in crowded fields and near bright stars, especially when combined with difference image analysis. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Skottfelt, J.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Bramich, D. M.; European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748, Garching bei München, Germany
Figuera Jaimes, R.; European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748, Garching bei München, Germany ; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
Jørgensen, U. G.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Kains, N.; European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748, Garching bei München, Germany
Harpsøe, K. B. W.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Liebig, C.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
Penny, M. T.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH, 43210, USA
Alsubai, K. A.; Qatar Foundation, PO Box 5825, Doha, Qatar
Andersen, J. M.; Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA, 02215, USA ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Bozza, V.; Dipartimento di Fisica "E. R. Caianiello", Università di Salerno, via Ponte Don Melillo, 84084, Fisciano, SA, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Browne, P.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
Calchi Novati, S.; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 84019, Vietri Sul Mare, SA, Italy
Damerdji, Yassine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Diehl, C.; Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120, Heidelberg, Germany ; Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029, Hamburg, Germany
Dominik, M.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
Elyiv, Andrii ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Giannini, E.; Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120, Heidelberg, Germany
Hinse, T. C.; Korea Astronomy and Space Science Institute, 305-348, Daejeon, Republic of Korea
Hundertmark, M.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
Juncher, D.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Kerins, E.; Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
Korhonen, H.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350, København K, Denmark
Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Rabus, M.; Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
Rahvar, S.; Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
Scarpetta, G.; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 84019, Vietri Sul Mare, SA, Italy ; Dipartimento di Fisica "E. R. Caianiello", Università di Salerno, via Ponte Don Melillo, 84084, Fisciano, SA, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Southworth, J.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Snodgrass, C.; Max-Planck-Institute for Solar System Research, Max-Planck Str. 2, 37191, Katlenburg-Lindau, Germany
Street, R. A.; Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA, 93117, USA
