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The red globular-like clusters in the Magellanic Clouds

Published online by Cambridge University Press:  14 August 2015

S. C. B. Gascoigne
S. C. B. Gascoigne*
Affiliation:
Mount Stromlo Observatory

Extract

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There are about 50 clusters in the Magellanic Clouds which from their spherical symmetry, integrated colours, and luminosities appear similar to the globular clusters in the Galaxy. The colour-magnitude diagrams of these clusters should give moduli for the Clouds, indications of the age and chemical composition of the clusters themselves, and perhaps some information about the evolutionary tracks of old stars generally. The first investigation of this kind was carried out by Arp on the SMC clusters NGC 361 and 419. This was followed by papers by Eggen and Sandage and by the writer on NGC 1783 in the LMC, and by Tifft (1962) on NGC 121 in the SMC. Of these four clusters only NGC 121 appeared really similar to a galactic globular cluster, the others displaying features not reproduced by any known cluster in the Galaxy. Further work was clearly needed to clarify the problems raised by these results, and a program for the systematic observation of the colour-magnitude diagrams of red clusters in the Clouds was accordingly begun here in September 1961. This contribution is a progress report on this program.

Type
Section II: The Magellanic Clouds
Information
Symposium - International Astronomical Union , Volume 20: The Galaxy and the Magellanic Clouds , 1964 , pp. 354 - 357
Copyright
Copyright © Australian Academy of Science 1964 

References

Summaries of earlier work in this field will be found in:Google Scholar
Arp, H. C. (1961).— Science 134: 810.Google Scholar
Gascoigne, S. C. B. (1961).—Special problems in the Magellanic Clouds. In “Problems in Extra-galactic Research.” (Ed. McVittie, G. C..) (MacMillan: London.)Google Scholar
Thackeray, A. D. (1963).— Advances Astron. Astrophys. 2: (in press). Referred to in text: Google Scholar
Arp, H. C., and Cuffey, J. (1962).— Ap. J. 136: 51–65.Google Scholar
Eggen, O. J., Lynden-Bell, D., and Sandage, A. R. (1962).— Ap. J. 136: 748–66.Google Scholar
Gascoigne, S. C. B. (1963).— Observatory 83: 71–4.Google Scholar
Johnson, H. L. (1959).— Lowell Bull. 99: 117–21.Google Scholar
Kron, G. E., and Mayall, N. U. (1960).— A.J. 65: 581.Google Scholar
Tifft, W. G. (1963).— M.N. 125: 199–260.Google Scholar