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

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posted on 2012-10-24, 09:09 authored by J. Irwin, S. Aigrain, S. Hodgkin, K. G. Stassun, L. Hebb, M. Irwin, E. Moraux, J. Bouvier, A. Alapini, R. Alexander, D. M. Bramich, J. Holtzman, E. L. Martin, M. J. McCaughrean, F. Pont, P. E. Verrier, M. R. Z. Osorio
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 ofGraphic 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.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2007, 380 (2), pp. 541-550

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

BLACKWELL PUBLISHING;Royal Astronomical Society (RAS)

issn

0035-8711

Copyright date

2007

Available date

2012-10-24

Publisher version

http://mnras.oxfordjournals.org/content/380/2/541

Language

English