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Mass Functions & Stellar Populations of Globular Clusters

Published online by Cambridge University Press:  14 August 2015

P. Guhathakurta ,
G. Piotto  and
E. Vesperini
P. Guhathakurta
Affiliation:
UCO/Lick Observatory, Univ. of California, Santa Cruz, CA 95064, USA
G. Piotto
Affiliation:
Dipartimento di Astronomia, Vicolo dell’Osservatorio, 5, I-35128 Padova, Italy
E. Vesperini
Affiliation:
Dept of Physics & Astronomy, Univ. of Massachusetts, Amherst, MA 01003, USA

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I present a summary of results from various HST photometric studies of the dense central regions of Galactic globular clusters that my collaborators and I have carried out over the last 6 years. The dataset includes short exposures of 47 Tuc, M15, M3 and M13 obtained with the aberrated Planetary Camera-I (PC-I) and F555W (“V”) and F785LP (“I”) filters, as well as post-refurbishment Wide Field Planetary Camera 2 (WFPC2) snapshots of the post core collapse clusters M15, M30, and NGC 6624 in F336W (“U”), F439W (“B”), and V. Recently, a very deep, doubly oversampled PC-I U image of the core of 47 Tuc, and accompanying B and V images, have also been analyzed. In addition, we have carried out extensive checks of incompleteness and photometric error with the help of multiband image simulations that mimic the relevant characteristics of the HST PC-I and WFPC2 images: empirical point spread function, crowding effects based on a realistic density profile and stellar luminosity function (LF), noise, undersampling, A/D saturation, etc..

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 2: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part B), 1997 , 1998 , pp. 603 - 608
Copyright
Copyright © Kluwer 1998

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