Variability in the Lambda Orionis cluster substellar domain

Abstract

We present the first results on variability of very low mass stars and brown dwarfs belonging to the 5 Myr Lambda Orionis cluster (Collinder 69). We have monitored almost continuously in the J filter a small area of the cluster which includes 12 possible members of the cluster during one night. Some members have turned to be short-term variable. One of them, LOri167, has a mass close to the planetary mass limit and its variability might be due to instabilities produced by the deuterium burning, although other mechanism cannot be ruled out.

Accepted for Astronomische Nachrichten. Workshop "Ultra-low-mass star formation and evolution", La Palma June 2005

References in corpus (7)

• Rotation and accretion of very low mass objects in the SigmaOri cluster
• Rotational periods of very young brown dwarfs and very low-mass stars in ChaI
• The substellar population of the young cluster lambda Orionis
• Photometric variability of young brown dwarfs in the sigma Orionis open cluster
• Rotation periods for very low mass stars in the Pleiades
• Photometric variability of a young, low-mass brown dwarf
• Pulsating young brown dwarfs

Cited by in corpus (3)

• SPITZER: Accretion in Low Mass Stars and Brown Dwarfs in the Lambda Orionis Cluster
• A deep look into the core of young clusters. II. lambda-Orionis
• Composite profile of the Fe K$\alpha$ spectral line emitted from a binary system of supermassive black holes