Cool Stars 14 - Submitted Abstract # 274
This version created on 05 October 2006

IRAC Spitzer photometry in sigma Orionis


Jose A. Caballero, Max-Planck-Institur fuer Astronomie (on behalf of the JOVIAN Collaboration)

We present a correlation between the DENIS and 2MASS catalogues and
IRAC data from the Spitzer Space Telescope Data Archive in a region
surrounding the O9.5V-type star sigma Ori A.  There is available
photometry in the IJHKs bands and at 3.6, 4.5, 5.8 and 8.0  mum for
several thousands sources.  We discuss on the presence of discs
surrounding a large fraction of members of the sigma Orionis cluster,
from the massive star domain to the planetary regime.

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