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Title:
WFPC2 observations of the globular cluster M30
Authors:
Yanny, Brian; Guhathakurta, Puragra; Schneider, Donald P.; Bahcall, John N.
Affiliation:
AA(Inst. for Advanced Study, Princeton, NJ, US), AB(Inst. for Advanced Study, Princeton, NJ, US), AC(Inst. for Advanced Study, Princeton, NJ, US), AD(Inst. for Advanced Study, Princeton, NJ, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 1, p. L59-L62 (ApJL Homepage)
Publication Date:
11/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Blue Stars, Globular Clusters, Radial Distribution, Color-Magnitude Diagram, Computerized Simulation, Hubble Space Telescope, Power Series, Stellar Luminosity
DOI:
10.1086/187594
Bibliographic Code:
1994ApJ...435L..59Y

Abstract

We describe images of the center of the dense globular cluster M30 (NGC 7099) obtained with the Hubble Space Telescope Wide Field/Planetary Camera 2 (HST WFPC2). Data taken in the F336W, F439W, and F555W filters (approximately U, B, and V) yield a color-magnitude diagram with photometric errors of 1 sigma = 0.05 mag for stars with V less than 17.5, and 1 sigma approximately 0.1 mag at V = 20, which is 1.5 mag fainter than the main-sequence turnoff. Simulations show that the star identifications are essentially complete for stars with V less than 19.5, even in the densest regions of the cluster. The projected radial distribution of stars can be represented by a power law distribution: N(r) approximately ralpha, with slope alpha = -0.4 +/- 0.15, into radii less than 0.4 sec (0.015 pc). The radial profile is also consistent with a flat core of any radius smaller than approximately 1.5 sec (0.05 pc), but inconsistent with any core radius larger than 2.5 sec (0.09 pc). A total of 30 blue straggler candidates within 20 sec of the cluster center have been identified from the three-color data. Their radial distribution is strongly centrally concentrated when compared to the horizontal branch, red giant branch, or main-sequence stars in the cluster. The abundance of blue stragglers (relative to red giants and subgiants) within r approximately less than 20 sec of the center of M30 is fBS = 0.19 =/- 0.04, about twice as high as in other dense clusters.

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