A brown dwarf candidate in the Praesepe Open Cluster
Astrophysics
2009-10-30 v1
Abstract
We present optical and infrared observations of RPr1, a faint (I = 21.01) and very red object (I - K = 4.57) discovered in a deep CCD survey, covering an area of 800 square arcmin of the Praesepe open cluster. A low resolution spectrum shows that RPr1 is a very late object, the latest object in Praesepe for which a spectrum has been taken to date. Our estimates give a mass between 0.063 and 0.084 solar masses, and indicate that RPr1 may turn out to be the first brown dwarf in this cluster.
Keywords
Cite
@article{arxiv.astro-ph/9802178,
title = {A brown dwarf candidate in the Praesepe Open Cluster},
author = {A. Magazzu and R. Rebolo and M. R. Zapatero Osorio and E. L. Martin and S. T. Hodgkin},
journal= {arXiv preprint arXiv:astro-ph/9802178},
year = {2009}
}
Comments
7 pages, 3 Postscript figures, to be published in The Astrophysical Journal Letters