New brown dwarf candidates in the Pleiades
Abstract
We have performed deep, wide-field imaging on a ~0.4 deg^2 field in the Pleiades (Melotte 22). The selected field was not yet target of a deep search for low mass stars and brown dwarfs. Our limiting magnitudes are R ~ 22mag and I ~ 20mag, sufficient to detect brown dwarf candidates down to 40MJ. We found 197 objects, whose location in the (I, R - I) color magnitude diagram is consistent with the age and the distance of the Pleiades. Using CTK R and I as well as JHK photometry from our data and the 2MASS survey we were able to identify 7 new brown dwarf candidates. We present our data reduction technique, which enables us to resample, calibrate, and co-add many images by just two steps. We estimate the interstellar extinction and the spectral type from our optical and the NIR data using a two-dimensional chi^22 fitting.
Cite
@article{arxiv.0903.0822,
title = {New brown dwarf candidates in the Pleiades},
author = {T. Eisenbeiss and M. Moualla and M. Mugrauer and S. Raetz and R. Neuhäuser and T. O. B. Schmidt and Ch. Ginski and M. M. Hohle and A. Koeltzsch and C. Marka and W. Rammo and A. Reithe and T. Roell and M. Vanko},
journal= {arXiv preprint arXiv:0903.0822},
year = {2015}
}
Comments
submitted to AN 37 pages (two long tables), 14 Figures