Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..133g&link_type=abstract
Astrophysics and Space Science, vol. 84, no. 1, May 1982, p. 133-141. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
5
Globular Clusters, Horizontal Branch Stars, Magellanic Clouds, Red Giant Stars, Star Distribution, Radii, Spatial Distribution, Stellar Magnitude, Stellar Mass, Subgiant Stars, Ubv Spectra
Scientific paper
A structural study of the old globular cluster NGC 1806 in the LMC has been carried out by star counts on B- and V-ESO 3.6 m telescope plates with three different limiting magnitude levels. The star density distribution was obtained directly from the surface strip count function with the Plummer formalism and the generalized Schuster law according to Lohmann. This yields besides the central density the structural parameter n and the characteristic length parameter R0 for each individual color and magnitude level. The results show that the blue stellar content of NGC 1806 - the horizontal branch stars - is more concentrated towards the cluster center than the red giant and subgiant objects. Also such a dynamical mass segregation is observed for the red giants compared with the subgiants.
Geyer Edward H.
Hopp Ulrich
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