Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4303l&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #43.03; Bulletin of the American Astronomical Society, Vol. 24, p.1187
Astronomy and Astrophysics
Astronomy
Scientific paper
The study of globular clusters near the galactic center is important to our understanding of the dynamics and chemical evolution of the Galaxy as well as our understanding of the evolution of low-mass stars. Because these bulge clusters are heavily obscured by interstellar dust, optical observations are difficult or even impossible. Using the UCLA 256x256 infrared camera (KCAM) and also infrared cameras at Kitt Peak and IRTF we have obtained IR images for a set of clusters which are located close to the galactic center, including Terzan 1, Terzan 2, Terzan 4, Terzan 5, Terzan 6, Terzan 9, Terzan 10, and UKS 1. Some of these clusters are obscured by up to 10 magnitudes in visual extinction. In addition, we have also obtained K band and R band images for eight globular clusters which are located in the bulge of the Galaxy and therefore have significant but less reddening than the former sample. They are NGC 6366, NGC 6402, NGC 6517, NGC 6539, NGC 6544, IC 1276, NGC 6712, and NGC 6749. For both samples profile fitting photometry is performed on the images to derive infrared magnitudes that allow us to construct infrared color-magnitude diagrams for giant branch stars in these clusters. For some of the observed clusters, the derived CMDs include cluster stars fainter than the horizontal branch. These observations allow improved or in some cases the only estimates of structural parameters, reddening, metallicity, horizontal branch morphology, and distances for these clusters. These observations will also eventually be used to constrain models for the evolution of low-mass stars with near solar abundances.
Becklin Eric E.
Bolte Michael
Liu Tao
McLean Ian S.
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