Fulltext

The Monitor project: JW 380 - a 0.26-, 0.15-M⊙, pre-main-sequence eclipsing binary in the Orion nebula cluster

Irwin, Jonathan ; Aigrain, Suzanne ; Hodgkin, Simon ; Stassun, Keivan G. ; Hebb, Leslie ; Irwin, Mike ; Moraux, Estelle ; Bouvier, Jerome ; Alapini, Aude ; Alexander, Richard ; Bramich, D. M. ; Holtzman, Jon ; Martín, Eduardo L. ; McCaughrean, Mark J. ; Pont, Frédéric ; Verrier, P. E. ; Zapatero Osorio, María Rosa

In: Monthly Notices of the Royal Astronomical Society, 2007, vol. 380, no. 2, p. 541-550

Aggiungi alla tua lista
    Titre
    • The Monitor project: JW 380 - a 0.26-, 0.15-M⊙, pre-main-sequence eclipsing binary in the Orion nebula cluster
    Auteur
    • Irwin, Jonathan. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Aigrain, Suzanne. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Hodgkin, Simon. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Stassun, Keivan G.. Department of Physics and Astronomy, Vanderbilt University, VU Station B 1807, Nashville, TN 37235, USA
    • Hebb, Leslie. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS
    • Irwin, Mike. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Moraux, Estelle. Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, F-38041 Grenoble Cédex 9, France
    • Bouvier, Jerome. Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, F-38041 Grenoble Cédex 9, France
    • Alapini, Aude. Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL
    • Alexander, Richard. JILA, University of Colorado, Boulder, CO 80309-0440, USA
    • Bramich, D. M.. Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Canary Islands, Spain
    • Holtzman, Jon. Astronomy Department, New Mexico State University, Las Cruces, NM 88003, USA
    • Martín, Eduardo L.. Instituto de Astrofísica de Canarias, C/Vía Láctea, s/n E38205, La Laguna, Tenerife, Spain
    • McCaughrean, Mark J.. Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL
    • Pont, Frédéric. Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, CH-1290 Sauverny, Switzerland
    • Verrier, P. E.. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Zapatero Osorio, María Rosa. Instituto de Astrofísica de Canarias, C/Vía Láctea, s/n E38205, La Laguna, Tenerife, Spain
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2007, vol. 380, no. 2, p. 541-550. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:300335
    Summary
    We report the discovery of a low-mass (0.26 ± 0.02, 0.15 ± 0.01 M⊙) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3 d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m Isaac Newton Telescope and Wide Field Camera for a survey of a single field in the Orion nebula cluster (ONC) region in V and i bands. The star is assigned a 99 per cent membership probability from proper motion measurements, and radial velocity observations indicate a systemic velocity within 1σ of that of the ONC. Modelling of the combined light and radial velocity curves of the system gave stellar radii of for the primary and the secondary, with a significant third light contribution which is also visible as a third peak in the cross-correlation functions used to derive radial velocities. The masses and radii appear to be consistent with stellar models for 2-3 Myr age from several authors, within the present observational errors. These observations probe an important region of mass-radius parameter space, where there are currently only a handful of known PMS EB systems with precise measurements available in the literature