Third parameter effects in globular clusters

Details Third parameter effects in globular clusters Third parameter effects in globular clusters

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1853v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1853-1857

Astronomy and Astrophysics

Astronomy

9

Density Measurement, Globular Clusters, Horizontal Branch Stars, Morphology, Stellar Luminosity, Abundance, Color-Magnitude Diagram, Data Correlation, Metallicity, Statistical Analysis

Scientific paper

We show that the apparent correlations between the length of the globular cluster horizontal branch and cluster luminosity and density (Fusi Pecci et al., 1993) may be affected by observational bias. This bias results from the fact that one can trace horizontal branches over greater lengths in rich clusters than in poor ones. The existence of a correlation between the length of the horizontal branch and the cluster central density is confirmed at about the 2 sigma level of confidence. The strength of an apparent correlation between cluster luminosity Mupsilon and the length of the horizontal branch is found to depend critically on the choice of sample used to analyze the data.

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