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Astron. Astrophys. 349, 448-456 (1999)

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Photometric and kinematic studies of open star clusters

I. NGC 581 (M 103)

J. Sanner 1, M. Geffert 1, J. Brunzendorf 2 and J. Schmoll 3

1 Sternwarte der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
2 Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
3 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Received 18 March 1999 / Accepted 12 July 1999


We present CCD photometry and a proper motion study of the young open star cluster, NGC 581 (M 103). Fitting isochrones to the colour magnitude diagram, we found an age of [FORMULA] Myr and a distance of roughly 3 kpc for this cluster. The proper motion study identifies 77 stars of [FORMULA] or brighter to be cluster members. We combine membership determination by proper motions and statistical field star subtraction to derive the IMF of the cluster and find a quite steep slope of [FORMULA].

Key words: Galaxy: open clusters and associations: individual: NGC 581 (M 103) – astrometry – stars: kinematics – stars: Hertzsprung – Russel (HR) and C-M diagrams – stars: luminosity function, mass function

Send offprint requests to: Jörg Sanner (jsanner@astro.uni-bonn.de)

© European Southern Observatory (ESO) 1999

Online publication: September 2, 1999