| Issue |
A&A
Volume 369, Number 2, April II 2001
|
|
|---|---|---|
| Page(s) | 511 - 526 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20010196 | |
| Published online | 15 April 2001 | |
Photometric and kinematic studies of open star clusters*
III. NGC 4103, NGC 5281, and NGC 4755
1
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
2
Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
Corresponding author: J. Sanner, jsanner@astro.uni-bonn.de
Received:
6
November
2000
Accepted:
22
January
2001
We present CCD photometry and proper motion studies of the three
open star clusters NGC 4103, NGC 5281, and NGC 4755 (κ Cru). By
fitting isochrones to the colour magnitude diagrams, we found that all three
objects are young open star clusters with ages of at most 
. They are located at distances from approx. 
to
, derived from distance moduli 
ranging from 
to 
. We combined membership determinations
based on proper motions and statistical field star subtraction to derive the
initial mass function (IMF) of the clusters. The shape of the IMFs could be
represented by power laws with exponents of 
for
NGC 4103, 
for NGC 5281, and 
for NGC 4755, when -as a reference -Salpeter's ([CITE])
value would be 
. These results agree well with other IMF
studies of open star clusters.
Key words: open clusters and associations: general / astrometry / stars: kinematics / Hertzsprung-Russell and C-M diagrams / stars: luminosity function, mass function
© ESO, 2001
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