The Oldest Star Clusters of Local Group Irregular Galaxies

Details The Oldest Star Clusters of Local Group Irregular Galaxies The Oldest Star Clusters of Local Group Irregular Galaxies

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6813h&link_type=abstract

HST Proposal ID #6813

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Hst Proposal Id #6813 Stellar Populations

Scientific paper

Globular clusters of spiral and elliptical galaxies are well- studied and they have provided much information on the early histories of these types of galaxies. For irregular galaxies, however, very little is known about the globular clusters and other old clusters. The only irregulars for which much globular cluster research has been carried out are the Magellanic Clouds, and they are probably anomalous because of the interactions of the Clouds with the Milky Way Galaxy {MWG}. We are proposing to investigate globular and other old clusters in two Local Group irregular galaxies: WLM and NGC 6822. The WLM globular appears from the limited available photometry to be a normal, massive old globular, possibly similar to the classical globulars of the MWG. The "Hubble clusters" of NGC 6822, which were identified as possible clusters by Hubble, on the other hand, are of lower luminosity, though their colors indicate that they are old. Study of these rare objects will be enlightening about the early history of irregular galaxies.

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