POSTER PAPER 2.04
The Substellar Domain in the Epsilon Orionis Cluster
V. J. S. Bejar, R. Rebolo, M. R. Zapatero Osorio, J. A. Caballero
Institute: Instituto de Astrofisica de Canarias
Institute: Caltech
Contact Email: vbejar@ll.iac.es
Abstract:
We present an IZ photometric survey covering a total area of about
1000 arcmin2 around the Epsilon Orionis young massive star
(~10 Myr, d=412 pc) and reaching a limiting magnitude
I=22. From the resulting I, I-Z color-magnitude diagram we
have selected 123 red candidates in the interval I=15--22 mag,
which according to evolutionary models corresponds to masses between
0.40 and 0.020 MSun, i.e, approaching the deuterium burning
mass limit. We have obtained follow-up J-band photometry for half
of our photometric candidates. The I, I-J color-magnitude
diagram and low-resolution optical spectroscopy of four of them
suggest that we have identified a rather abundant population of
young low-mass stars and brown dwarfs. We compare our findings with
previous works in other young clusters.
Index Keywords: Epsilon Ori; Brown Dwarfs & Extrasolar Planets; Very Low Mass Stars
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Manuscript submitted: 2001-Sep-07
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.