Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..445p&link_type=abstract
Astronomy Reports, Volume 43, Issue 7, July 1999, pp.445-458
Astronomy and Astrophysics
Astronomy
Scientific paper
A study has been conducted of the spatial structure of the globular cluster NGC 5466 as functions of Delta B-magnitude interval and of the limiting B magnitudes used in star counts. Our analysis is based on astrometric and photometric measurements from photographic plates obtained with the 2-m reflector of the National Astronomical Observatory of Bulgaria. The differential and integrated apparent (Delta F(r) and F(r)) and spatial (Delta f(r) and f(r)) stellar-density functions are analyzed for various intervals of Delta B and limiting magnitudes down to B = 21^m. The structure of the cluster varies systematically as we proceed to fainter stars, starting from the transition region between the subgiant branch to the turnoff from the main sequence in the (V, B_V) diagram. This variation is twofold: (1) the radii of individual spatial zones of the cluster and of the cluster as a whole homologously increase in accordance with a single law, and (2) the stellar density distribution changes-the rate of increase in the number of faint stars with increase in B grows as we move outward in the cluster. Empirical relationships have been derived describing these variations and parameters defining the structure of the cluster.
Peykov Z. I.
Roussev R. M.
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