The Main Sequence Luminosity Function of Palomar 5 from HST

Details The Main Sequence Luminosity Function of Palomar 5 from HST The Main Sequence Luminosity Function of Palomar 5 from HST

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0313g&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #03.13; Bulletin of the American Astronomical Society, Vol. 31, p.1371

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A low mass, large core radius, and a low central concentration suggest that the globular cluster Palomar 5 lost a large fraction of its initial mass at some point in the past. If the dynamical evolution of Palomar 5 has been dominated by the effects of mass loss, then theoretical arguments suggest that the luminosity function should be deficient in low-mass stars. Using deep WFPC2 F555W and F814W photometry, we determine the main sequence luminosity function both near the cluster center and in a field beyond the half-light radius. The turnoff occurs at V 20.6, and the main sequence can be followed to V 26 before merging with field objects down to the limiting magnitude of V 27. We compare the luminosity functions in the two fields with one another, and with that of Omega Cen, to search for evidence of a low mass cutoff and/or mass segregation within the cluster. This research is supported in part by STScI grant GO-06788.

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