HST Observations of the Globular Clusters of NGC 6822

Details HST Observations of the Globular Clusters of NGC 6822 HST Observations of the Globular Clusters of NGC 6822

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0308z&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #03.08; Bulletin of the American Astronomical Society, Vol. 31, p.1370

Astronomy and Astrophysics

Astronomy

Scientific paper

The globular clusters of spiral and elliptical galaxies are reasonably well-studied, and they have yielded a great deal of information about the early histories of these types of galaxies. However, comparatively little is known about the globular clusters of irregular galaxies. As part of a study of the Local Group irregular galaxy NGC 6822, we used HST to observe the four potential globular clusters identified by Hubble in 1925. We obtained WFPC-2 images of all four targets in the F555W ( V) and F814W ( I) filters, and generated color-magnitude diagrams from the resulting photometry. The data reveal that three targets are globular or globular-like clusters representing a wide range of ages: very old (Hubble VII), intermediate in age (Hubble VIII), and young (Hubble VI). The fourth target, Hubble IV, is an H II region.

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