NGC2298: a globular cluster on its way to disruption

NGC2298 :: new preprint

NGC2298: a globular cluster on its way to disruption
Authors: Guido De Marchi (ESA), Luigi Pulone (INAF)
Comments: 9 pages, 6 figures, accepted for publication in Astronomy and Astrophysics

We have studied the stellar main sequence (MS) of the globular cluster NGC2298 using deep HST/ACS observations in the F606W and F814W bands covering an area of 3.4′ x 3.4′ around the cluster centre or about twice the cluster’s half-mass radius. The colour-magnitude diagram that we derive in this way reveals a narrow and well defined MS extending down to the 10 sigma detection limit at m_606~26.5, m_814~25, corresponding to stars of ~0.2 Msolar. The luminosity function (LF) obtained with these data, once corrected for the limited effects of photometric incompleteness, reveals a remarkable deficiency of low-mass stars as well as a radial gradient, in that the LF becomes progressively steeper with radius (…)

URL: http://arxiv.org/abs/astro-ph/0612026

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