UBVI and
H
Photometry of the h &
 Persei Cluster
Stefan C. Keller1,
Eva K. Grebel2,
Grant J. Miller3,
and
Kenneth M. Yoss4
1
IGPP/Lawerence Livermore National Lab., 7000
East Ave., Livermore, CA 94550 USA
2
Max Planck Institute for Astronomy, Königstuhl 17,
D-69117 Heidelberg, Germany
3
Southwestern College, 900 Otay Lakes Road, Chula Vista CA 91910
4
Department of Astronomy, University of Illinois at
Urbana-Champaign, 1002 West Green Street, Urbana IL 61801
UBVI and
H
photometry is presented for
17319 stars in the vicinity of the young double cluster
h &  Persei.
Our photometry extends over a 37'×1° field centered on the
association. We construct reddening contours within the imaged field.
We find that the two clusters share a common distance modulus of
11.75±0.05 and ages of log age(yr) = 7.1±0.1. From the
V-H colour, a measure of
the H emission strength, we
conduct a survey for emission line objects within the association. We
detect a sample of 33 Be stars, 8 of which are new detections. We
present a scenario of evolutionary enhancement of the Be phenomenon to
account for the peak in Be fraction towards the top of the
main-sequence in the population of
h & Persei
and similar young clusters.
Accepted by AJ
Preprints on the web at
http://xxx.lanl.gov/abs/astro-ph/0104179
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