The spatial structure of the globular cluster NGC 6171

Details The spatial structure of the globular cluster NGC 6171 The spatial structure of the globular cluster NGC 6171

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..694p&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, July-Aug. 1990, p. 694-713. In Russian.

Astronomy and Astrophysics

Astronomy

6

Galactic Evolution, Galactic Structure, Globular Clusters, Stellar Magnitude, Density Distribution, Main Sequence Stars

Scientific paper

This paper investigates the spatial structure of the globular cluster NGC 6171 as dependent on the values of the star magnitude interval Delta B and the limiting star magnitude B, using photometric and astrometric measurements on a plate obtained with the NAO (Bulgaria) 2-m reflector telescope. The results of the analysis show that the structure of the cluster changes systematically with the transition to fainter stars, starting from the transient region between the subgiant branch and the main-sequence turn-off on the V, B-V diagram. The change occurs in two directions: a homologous increase of the spatial zone radii of the cluster and the cluster's radius, and a change in the star density distribution. Empirical relationships describing these changes are obtained together with the parameters describing the cluster structure.

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