Star counts, blue stragglers, and mass segregation in NGC 7492

Details Star counts, blue stragglers, and mass segregation in NGC 7492 Star counts, blue stragglers, and mass segregation in NGC 7492

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1358c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Oct. 1991, p. 1358-1370.

Astronomy and Astrophysics

Astronomy

38

Globular Clusters, Star Distribution, Stellar Mass, Color-Magnitude Diagram, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

A cluster color-magnitude diagram for NGC 7492 that traces the main sequence to about one magnitude fainter than that of Buonanno et al. (1987) is presented, as well as star counts for ten annuli centered on the cluster core. The global luminosity functions and the mass functions in each annulus are constructed under a set of uniform data reduction procedures and inspected for evidence of mass segregation. The discovery is reported of 27 candidate blue stragglers which are found to be more centrally concentrated than the cluster of subgiants of similar brightness. It is suggested that if mass segregation has occurred in the cluster, the blue stragglers are more massive than the stars at the main-sequence turnoff. No evidence is found for mass segregation in either the surface density profiles or in the luminosity functions at different radial positions.

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