Variability in the Lambda Orionis cluster substellar domain

Details Variability in the Lambda Orionis cluster substellar domain Variability in the Lambda Orionis cluster substellar domain

2005-10-13

arxiv.org/abs/astro-ph/0510402v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1002/asna.200510443

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.

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