| Issue |
A&A
Volume 370, Number 1, April IV 2001
|
|
|---|---|---|
| Page(s) | 87 - 99 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20010230 | |
| Published online | 15 April 2001 | |
The IMF of open star clusters with Tycho-2*
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
Corresponding author: J. Sanner, jsanner@astro.uni-bonn.de
Received:
14
September
2000
Accepted:
7
February
2001
We studied the fields of nine nearby open star clusters based on
the Tycho-2 catalogue. We determined membership probabilities for the stars
in the cluster fields from the stellar proper motions and used the Tycho-2
photometry to compute the initial mass function (IMF) of the clusters from
the main sequence turn-off point down to approx. 
. We found IMF
slopes ranging from 
down to 
(when the Salpeter
[CITE] value would be 
). We also studied the
membership of individual stars of special astrophysical interest. In some
cases previous results had to be revised. As a by-product, we
investigated some general properties of the Tycho-2 catalogue; we
confirmed that the Tycho-2 proper motions show only marginal deviations
from the Hipparcos catalogue. On the other hand, in some regions the
completeness of the catalogue seems to decrease at magnitudes brighter than
claimed by Høg et al. ([CITE]).
Key words: open clusters and associations: general / catalogs / astrometry / stars: kinematics / Hertzsprung-Russell (HR) and C-M diagrams / stars: luminosity function, mass function
© ESO, 2001
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