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Infrared photometry of metal rich galactic globular clusters

Cohen, Judith G. and Sleeper, Celeste (1995) Infrared photometry of metal rich galactic globular clusters. Astronomical Journal, 109 (1). pp. 242-263. ISSN 0004-6256. doi:10.1086/117269. https://resolver.caltech.edu/CaltechAUTHORS:20190603-153225071

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Abstract

Infrared photometry is presented for the giant branches of five galactic globular clusters, including three very metal rich ones located near the galactic center. New visual photometry was required for three of these objects. The metallicities of these clusters as inferred from the dereddened colors of their giant branches are in reasonable agreement with those inferred by spectroscopy of the integrated light of these systems. The spread in color seen along the giant branches of the most highly reddened of these globular clusters is shown to be consistent with patchy interstellar reddening. Abundance variations within a cluster are not required to explain the observations. The range of metallicity is confined to less than 0.2 dex in NGC 5927, and to 0.1 dex in NGC 7099. The spread in V—K color is a strong constraint on abundance variations within a globular cluster.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/117269DOIArticle
http://adsabs.harvard.edu/abs/1995AJ....109..242CADSArticle
ORCID:
AuthorORCID
Cohen, Judith G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1994 July 1; revised 1994 September 7. Eric Persson and his team built the infrared camera in use at the Las Campanas Observatory. We are grateful to him and to Jay Frogel for several useful discussions. We are grateful to the Cerro Tololo Inter-American Observatory for the service observing of CCD images in V and R of NGC 5927 and of NGC 6624 using the Yale telescope. Keith Matthews helped with the infrared observations at the 200 in. telescope at Palomar Mountain. ECS was partially supported by a stipend from the National Physical Science Consortium.
Funders:
Funding AgencyGrant Number
National Physical Science ConsortiumUNSPECIFIED
Issue or Number:1
DOI:10.1086/117269
Record Number:CaltechAUTHORS:20190603-153225071
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190603-153225071
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96087
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:04 Jun 2019 21:26
Last Modified:16 Nov 2021 17:17

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