Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007astl...33..649f&link_type=abstract
Astronomy Letters, Volume 33, Issue 10, pp.649-655
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Based on our own observational data, we have constructed the mass functions for three young-and intermediate-age Galactic star clusters, Trumpler 2, NGC 7243, and NGC 1513. Their mean slopes Γ fall within the Scalo range: Γ = -1.7 ± 0.5 for 1 M &sun; < M < 10 M &sun;. For each of the clusters, we also analyze the mass distribution of their members as a function of the distance to the center. Noticeable mass segregation in the sense of massive-star concentration toward the cluster center has been detected in Trumpler 2 and NGC 7243. Deviations from rectilinearity in the same direction are observed at log M ≈ 0.41 in each of the three zones of Trumpler 2, which can be interpreted as a small dip in the mass function. We have found peculiarities in NGC 1513 that are difficult to explain by observational selection alone. Comparison of our results with similar studies reveals a similarity in radial Γ distribution for NGC 7243 with h Per and for Trumpler 2 with IC 1805.
Ananjevskaja Yu. K.
Frolov V. H.
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