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Dynamical evolution effects on the hot stellar populations in globular clustersResults of a study of FUV properties of Galactic globular clusters are presented. The spatially resolved spectra measured with the IUE satellite are used to find indications of color gradients in two clusters with the postcore-collapse (PCC) morphology, NGC 6752 and NGC 7099, but not in the case of NTGC 6093, a cluster with the classical King-model-type morphology. These FUV color gradients may be caused by the presence of a highly concentrated population of hot objects, such as the extreme BHB stars, blue stragglers, etc. This result extends to the FUV regime the trends seen in the ground-based data in the visible regime. PCC or highly concentrated small-core lusters are found to have bluer HB morphologies and bluer FUV colors, and the bluest FUV colors at a given metallicity. These trends indicate that dynamical evolution of clusters played some role in determining the net abundance and the spatial distribution of their hot stellar populations.
Document ID
19930032989
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Djorgovski, S.
(California Inst. of Technology Pasadena, United States)
Piotto, Giampaolo
(Padova, Univ. Padua, Italy)
Date Acquired
August 15, 2013
Publication Date
December 1, 1992
Publication Information
Publication: Astronomical Journal
Volume: 104
Issue: 6
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
93A16986
Funding Number(s)
CONTRACT_GRANT: NAG5-1173
CONTRACT_GRANT: NSF AST-91-57412
Distribution Limits
Public
Copyright
Other

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