Modification of stellar populations in post-core-collapse globular clusters

Details Modification of stellar populations in post-core-collapse globular clusters Modification of stellar populations in post-core-collapse globular clusters

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..41d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 1, 1991, p. L41-L44. Research supported by Alfred P. Slo

Astronomy and Astrophysics

Astrophysics

97

Astronomical Photography, Binary Stars, Faint Objects, Globular Clusters, Star Clusters, Stellar Evolution, Charge Coupled Devices, Giant Stars, Pixels, Spatial Distribution

Scientific paper

Preliminary results from a survey for color and population gradients in globular cluster cores are presented. It is found that clusters with central cusps (presumably collapsed cores) become bluer toward their centers. The effect involves at least a few percent of the total visible light. The color gradients seem to be caused by the demise of red giants and/or subgiants, and possibly an increased number of faint, blue objects. No gradients are seen in clusters with King-model morphology. This may be the strongest evidence so far that dynamical evolution of star clusters can physically modify their stellar populations.

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