Optical and infrared photometry of new very low-mass stars and brown dwarfs in the Sigma Orionis cluster

V. J. S. Bejar, M. R. Zapatero Osorio, R. Rebolo

We present an RI photometric survey covering an area of 430 arcmin^2 around the multiple star Sigma Orionis. The observations were conducted with the 0.8 m IAC-80 Telescope at the…