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Astronomy and Astrophysics Supplement Series, Vol. 119, October II 1996, 221-230
Deep CCD photometry and the initial mass function of the core of the OB cluster Berkeley 86
H.J. Deeg 
and Z. Ninkov 
Send offprint requests to: H.J. Deeg at the Instituto de Astrofisica de
Canarias
Rochester Institute of Technology,
Center for Imaging Science, Rochester, NY 14623, U.S.A.
Instituto de Astrofisica de Canarias, Via Lactea s/n, 38200 La
Laguna, Tenerife, Spain
email: hdeeg@iac.es, zxnpci@cis.rit.edu
Received August 17, 1995; accepted March 6, 1996
Abstract:
Based on photometry of deep CCD frames of the central region of the OB cluster Berkeley 86, we derive the cluster mass function. The absence of current star formation, and the cluster's young age of about 6 Myrs, leads to the conclusion that the initial mass function (IMF) and the current mass function are identical for stars with m < 10
. In the range of 
, an IMF with
a slope of 
is found. This value agrees well with
other recent determinations of young clusters IMFs which are
close to the classical Salpeter IMF with 
. Sections of
the IMF of Berkeley 86 that are significantly steeper, or
flatter, are most likely the result of a dip in the star's mass
distribution in the range of 
. Similar dips may have
led to steep IMFs over narrow mass ranges, as reported in the
literature for some other clusters. No sign for a low mass
turn-over in the IMF of Berkeley 86 is found for masses
extending down to 0.85 
.
Key words: stars: luminosity function, mass function --- open clusters and associations: individual: Bky 86
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