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Eight PopII Cepheids Recently Identified in Globular Clusters

Published online by Cambridge University Press:  12 April 2016

C. Clement ,
H. Sawyer Hogg  and
T. Wells
C. Clement
Affiliation:
David Dunlap Observatory, Univ. of Toronto, Toronto M5S 1A7
H. Sawyer Hogg
Affiliation:
David Dunlap Observatory, Univ. of Toronto, Toronto M5S 1A7
T. Wells
Affiliation:
David Dunlap Observatory, Univ. of Toronto, Toronto M5S 1A7

Extract

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The University of Toronto 24-inch telescope at the Las Campanas Observatory of the Carnegie Institution of Washington has beerused for the study of variables in four southern globular clusters: NGC 6273=1119, NGC 6284, NGC 6293 and NGC 6333-M9.

The first three of these clusters lie about 2° from one another in the sky at southern declinations ranging from about 24.5° to 26.5°. They were investigated by one of us (Sawyer 1943) using photographs obtained at the Steward Observatory in Arizona in 1939. A number of variables were discovered, but even with additional David Dunlap plates, it was not possible to determine any periods because of the large southern declinations. At Las Campanas (latitude 29°S), they pass close to the zenith and therefore the periods are more readily determined. From our Las Campanas data, we have found that there are four Cepheids in NGC 6273, two in NGC 6284 and one in NGC 6293.

Type
Part IV. Population II Cepheids
Information
International Astronomical Union Colloquium , Volume 82: Cepheids: Theory and Observations , 1985 , pp. 262 - 263
Copyright
Copyright © Cambridge University Press 1985

References

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