X. Haubois

Publications (4)0 Total impact

• Source

  Available from: Cédric Foellmi

  Article: A brown dwarf companion to the intermediate-mass star HR6037

  N. Huelamo, D. E. A. Nuernberger, V. D. Ivanov, G. Chauvin, G. Carraro, M. F. Sterzik, C. H. F. Melo, M. Bonnefoy, M. Hartung, X. Haubois, C. Foellmi
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  ABSTRACT: In the course of an imaging survey we have detected a visual companion to the intermediate-mass star HR 6037. In this letter, we present two epoch observations of the binary with NACO/VLT, and near-IR spectroscopy of the secondary with ISAAC/VLT. The NACO observations allow us to confirm HR 6037B as a co-moving companion. Its J and H band ISAAC spectra suggest the object has an spectral type of M9+-1, with a surface gravity intermediate between that of 10 Myr dwarfs and field dwarfs with identical spectral type. The comparison of its Ks-band photometry with evolutionary tracks allows us to derive a mass, effective temperature, and surface gravity of 62+-20 MJup, Teff = 2330+-200 K, and log g = 5.1+-0.2, respectively. The small mass ratio of the binary, -0.03, and its long orbital period, -5000 yr, makes HR 6037 a rare and uncommon binary system. Comment: (5 pages, 4 figures, accepted for publication in A&A Letters)
  09/2010;
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  Available from: Cédric Foellmi

  Article: Common Proper Motion Search for Faint Companions Around Early-Type Field Stars - Progress Report - II

  Valentin D. Ivanov, D. Nuernberger, G. Chauvin, C. Foellmi, M. Hartung, N. Huelamo, C. Melo, M. Sterzik, X. Haubois
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  ABSTRACT: The multiplicity of early-type stars is still not well established. The studies of individual star forming regions suggest a connection with the age and the environment. To fill in this gap, we started the first detailed adaptive-optic-assisted imaging survey of 308 BA-type field stars within 300 pc from the Sun, to derive their multiplicity in a homogeneous way. Our first epoch observations yield 195 companion candidates around 117 sample targets. The second epoch observations are underway. Comment: in "Visions for Infrared Astronomy - A tribute to Pierre Lena", held in 20-22 March 2006 in Paris, France; 4 pages
  05/2006;
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  Available from: Cédric Foellmi

  Chapter: Multiplicity of Early-type Stars in the Field: Progress Report

  N. Huélamo, G. Chauvin, C. Foellmi, M. Hartung, X. Haubois, V. Ivanov, C. Melo, D. Nürnberger, M. Sterzik
  01/1970: pages 295-298;
• Source

  Available from: Cédric Foellmi

  Article: A brown dwarf companion to the intermediate-mass star HR 6037

  N. Huelamo, D. E. A. Nurnberger, V. D. Ivanov, G. Chauvin, G. Carraro, M. F. Sterzik, C. H. F. Melo, M. Bonnefoy, M. Hartung, X. Haubois, C. Foellmi
  http://dx.doi.org/10.1051/0004-6361/201015708.