stars: fundamental parameters; globular clusters: individual: NGC 6333; stars: variables: general; stars: variables: RR Lyrae
Abstract :
[en] We report CCD V and I time series photometry of the globular cluster NGC 6333 (M9). The technique of difference image analysis has been used, which enables photometric precision better than 0.05 mag for stars brighter than V ˜ 19.0 mag, even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RRc stars, three eclipsing binaries, seven long-term variables and one field RRab star behind the cluster. A detailed identification chart and equatorial coordinates are given for all the variable stars in the field of our images of the cluster. Our data together with the literature V-data obtained in 1994 and 1995 allowed us to refine considerably the periods for all RR Lyrae stars. The nature of the new variables is discussed. We argue that variable V12 is a cluster member and an Anomalous Cepheid. Secular period variations, double-mode pulsations and/or the Blazhko-like modulations in some RRc variables are addressed. Through the light-curve Fourier decomposition of 12 RR Lyrae stars we have calculated a mean metallicity of [Fe/H][SUB]ZW[/SUB] = -1.70 ± 0.01(statistical) ± 0.14(systematic) or [Fe/H]_{text{UVES}}=-1.67 ± 0.01(statistical) ± 0.19(systematic). Absolute magnitudes, radii and masses are also estimated for the RR Lyrae stars. A detailed search for SX Phe stars in the Blue Straggler region was conducted but none were discovered. If SX Phe exist in the cluster then their amplitudes must be smaller than the detection limit of our photometry. The colour-magnitude diagram has been corrected for heavy differential reddening using the detailed extinction map of the cluster of Alonso-García et al. This has allowed us to set the mean cluster distance from two independent estimates; from the RRab and RRc absolute magnitudes, we find 8.04 ± 0.19 and 7.88 ± 0.30 kpc, respectively.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Arellano Ferro, A.; Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria CP 04510, Mexico
Bramich, D. M.; European Southern Observatory, Karl-Schwarzschild-Straβe 2, D-85748 Garching bei München, Germany
Figuera Jaimes, R.; European Southern Observatory, Karl-Schwarzschild-Straβe 2, D-85748 Garching bei München, Germany ; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS, UK
Giridhar, Sunetra; Indian Institute of Astrophysics, Koramangala 560034, Bangalore, India
Kains, N.; European Southern Observatory, Karl-Schwarzschild-Straβe 2, D-85748 Garching bei München, Germany
Kuppuswamy, K.; Indian Institute of Astrophysics, Koramangala 560034, Bangalore, India
Jørgensen, U. G.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Alsubai, K. A.; Qatar Foundation, PO Box 5825, Doha, Qatar
Andersen, J. M.; Department of Astronomy, Boston University, 725 Commonwealth Ave, Boston, MA 02215, USA ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Bozza, V.; Dipartimento di Fisica `E.R Caianiello', Universit di Salerno, Via Ponte Don Melillo, I-84084 Fisciano, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy
Browne, P.; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS, UK
Calchi Novati, S.; Dipartimento di Fisica `E.R Caianiello', Universit di Salerno, Via Ponte Don Melillo, I-84084 Fisciano, Italy ; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 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 (ZAH), Mönchhofstr. 12-14, D-69120 Heidelberg, Germany ; Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
Dominik, M.; SUPA, School of Physics and Astronomy, University of St. Andrews, 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 (ZAH), Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
Harpsøe, K.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Hessman, F. V.; Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
Hinse, T. C.; Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea ; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
Hundertmark, M.; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS, UK
Juncher, D.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, 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, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Liebig, C.; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS, UK
Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Mathiasen, M.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
Penny, M. T.; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Rabus, M.; Instituto de Astrofísica, Facultad de Física, 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 ; Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo ON N2L 2Y5, Canada
Ricci, Davide ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Scarpetta, G.; Dipartimento di Fisica `E.R Caianiello', Universit di Salerno, Via Ponte Don Melillo, I-84084 Fisciano, Italy ; INFN, Gruppo Collegato di Salerno, Sezione di Napoli, Italy
Skottfelt, J.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Snodgrass, C.; Max Planck Institute for Solar System Research, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany
Southworth, J.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
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