Volume 369, Number 2, April II 2001
|Page(s)||511 - 526|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||15 April 2001|
Photometric and kinematic studies of open star clusters*
III. NGC 4103, NGC 5281, and NGC 4755
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
2 Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
Corresponding author: J. Sanner, firstname.lastname@example.org
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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