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Two Cepheid variables in the Fornax dwarf galaxyTwo fields surrounding globular clusters 2 and 3 in the Fornax dwarf spheroidal galaxy have been searched for short-period variable stars that are brighter than the horizontal branch. This survey confirmed as variable the two suspected suprahorizontal-branch variables discovered by Buonanno et al. (1985) in their photometry of the clusters. The observations show that the star in cluster 2 is a W Virginis variable of 14.4 day period. It is the first W Vir variable to be found in a dwarf spheroidal galaxy, and its proximity to the center of cluster 2 suggests that it is a cluster member. The other star appears to be an anomalous Cephpeid of 0.78 day period. It lies outside or very near the boundary of cluster 3, and is therefore probably a member of the field population of Fornax. Although no other suprahorizontal-branch variables were discovered in the survey, it did confirm as variable two of the RR Lyrae candidates of Buonanno et al., which appeared at the survey limit. The implications of these observations for the understanding of the stellar content at Fornax are discussed.
Document ID
19860060842
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Light, R. M. (Yale Univ. Observatory New Haven, CT, United States)
Armandroff, T. E. (Yale Univ. Observatory New Haven, CT, United States)
Zinn, R. (Yale University Observatory, New Haven, CT, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1986
Publication Information
Publication: Astronomical Journal
Volume: 92
ISSN: 0004-6256
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NSF AST-83-04034
CONTRACT_GRANT: NAGW-78
Distribution Limits
Public
Copyright
Other