Volume 424, Number 2, September III 2004
|Page(s)||619 - 625|
|Section||Stellar structure and evolution|
|Published online||23 August 2004|
X-ray detections of two young bona-fide brown dwarfs*
Max Planck für Extraterrestrische Phyisk, Giessenbachstraße, 85748 Garching bei München, Germany e-mail: email@example.com Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la piscine, 38400 Saint Martin d'Hères, France European Southern Observatory, Karl Schwarzschildtstraße 2, 85748 Garching bei München, Germany
Accepted: 17 April 2004
I report the detection of two bona-fide brown dwarfs by XMM-Newton: [GY92] 141 in the ρ -Ophiuchus star-forming region and DENIS J155601-233809 in the Upper Scorpius OB association. The two objects have been detected with luminosities of erg s-1 and erg s-1 respectively, corresponding to luminosity ratios of log ( and log (. The two sources were close to the limit of detection of the instruments at only 2~3-σ above the background level, and no significant flare or variation could be detected during the 48.3 ks and 33.9 ks observations. [GY92] 141 had already been observed 10 months earlier with Chandra by [CITE] with a luminosity ~14 times fainter than the one reported here, indicating that the X-ray emission of this object is strongly variable.
Key words: stars: low-mass, brown dwarfs / stars: coronae / X-rays: individuals: [GY92] 141, DENIS J155601-233809
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.