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

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

2004-04-06

arxiv.org/abs/astro-ph/0404125v1

Astronomy and Astrophysics

Astrophysics

Acepted to be published in Astronomische Nachrichten. 9 pages, 7 figures

Scientific paper

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 Teide Observatory. The survey limiting R and I magnitudes are 22.5 and 21, and completeness magnitudes 21 and 20, respectively. We have selected 53 candidates from the I vs. R-I colour-magnitude diagram (I=14-20) that follow the previously known photometric sequence of the cluster. Adopting an age of 2-4 Myr for the cluster, we find that these objects span a mass range from 0.35 Msol to 0.015 Msol. We have performed J-band photometry of 52 candidates and Ks photometry for 12 of them, with the result that 50 follow the expected infrared sequence for the cluster, thus confirming with great confidence that the majority of the candidates are bona fide members. JHKs photometry from the Two Micron All Sky Survey (2MASS) is available for 50 of the candidates and are in good agreement with our data. Out of 48 candidates, which have photometric accuracies better than 0.1 mag in all bands, only three appear to show near-infrared excesses.

Affiliated with

Also associated with

No associations

Rating

Optical and infrared photometry of new very low-mass stars and brown dwarfs in the Sigma Orionis cluster does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical and infrared photometry of new very low-mass stars and brown dwarfs in the Sigma Orionis cluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical and infrared photometry of new very low-mass stars and brown dwarfs in the Sigma Orionis cluster will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-600497