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Tidal Radii and Masses of Galactic Open Clusters

Published online by Cambridge University Press:  01 September 2007

Elena Schilbach ,
Nina V. Kharchenko ,
Anatoly E. Piskunov ,
Siegfried Röser  and
Ralf-Dieter Scholz
Elena Schilbach
Affiliation:
Astronomisches Rechen-Institut, Moenchhofstr. 12-14, 69120 Heidelberg, Germany email: elena@ari.uni-heidelberg.de
Nina V. Kharchenko
Affiliation:
Main Astronomical Observatory, Kiev, Ukraine
Anatoly E. Piskunov
Affiliation:
Institute of Astronomy of the Russian Acad. Sci., Moscow, Russia
Siegfried Röser
Affiliation:
Astronomisches Rechen-Institut, Moenchhofstr. 12-14, 69120 Heidelberg, Germany email: elena@ari.uni-heidelberg.de
Ralf-Dieter Scholz
Affiliation:
Astrophysikalisches Institut Potsdam, Potsdam, Germany
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Abstract

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For 236 of 650 Galactic open clusters identified in the ASCC-2.5 catalogue, we determine tidal radii from a three-parameter fit of King's profiles to the observed integrated density distribution of cluster members. The results are used to calibrate the observed sizes of the remaining clusters to a uniform scale of tidal radii of open clusters in the Solar neighbourhood. The tidal masses are computed from tidal radii. Within a distance of 850 pc where our sample is complete, the observed distributions of cluster masses can be explained by a general mass loss in open clusters with increasing age.

Keywords

open clusters and associations: generalGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 117 - 118
Copyright
Copyright © International Astronomical Union 2008

References

Lamers, H. J. G. L. M., et al. 2005, A&A 441, 117Google Scholar
Piskunov, A., Schilbach, E., Kharchenko, N., Röser, S., & Scholz, R. 2007, A&A 468, 151Google Scholar