POSTER PAPER 4.14
Low Mass Stars and Brown Dwarfs in Cepheus OB3
S. A. Thompson, R. D. Jeffries, T. Naylor
Institute: Keele University, UK
Institute: Exeter University, UK
Contact Email: sat@astro.keele.ac.uk
Abstract:
An initial analysis suggests a surprising dearth of stars below the
hydrogen burning threshold in the young unbound OB association,
Cepheus OB3b. Evidence has been collected from two deep imaging
surveys, covering 1.12 square degrees in the optical (RIcZ)
bands, and 0.13 square degrees in the near infra-red
(JHKs). The limiting magnitudes are approximately 23.5 in I
and 20.0 in J. Suspected cluster members have been selected initially
from an I v I-Z colour magnitude diagram. By matching the positions of
these sources with the corresponding NIR counterparts, we have
completed a catalogue of optical and NIR magnitudes for candidate
members of the association. Following individual de-reddening of these
stars, masses have been derived from the J magnitudes using model
isochrones. Our conclusions are complicated by both incompleteness due
to the crowded nature of the region and an apparent age spread.
Index Keywords: Cepheus OB3
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Manuscript submitted: 2001-Sep-03
"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.