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Red Variable Stars in Metal Rich Globular Clusters

Published online by Cambridge University Press:  12 April 2016

T. Lloyd Evans  and
J. W. Menzies
T. Lloyd Evans
Affiliation:
Radcliffe Observatory, Pretoria; Royal Observatory, Edinburgh
J. W. Menzies
Affiliation:
Radcliffe Observatory, Pretoria; University Observatory, Oxford

Extract

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The globular clusters contain sufficiently large numbers of stars to permit a systematic study of the intrinsically rare variable stars which lie near the tip of the red giant branch. The position of the smaller amplitude stars in the colour magnitude diagram is of particular interest. Eggen (1972) has published photoelectric observations of such stars in several globular clusters, most of intermediate or low metal abundance. The mean colour of 14 stars in 5 clusters is (V-IK) = 1.40, with a spread from 1.60 to 1.12 (or 0.75 if V8 in M22 is of this type) which Eggen regards as indicating a range of temperature. The red variable stars in the metal rich globular cluster 47 Tucanae are much redder and show a considerable range of colour.

Type
Part III / Slow Variables in Population II Systems
Information
International Astronomical Union Colloquium , Volume 21: Variable Stars in Globular Clusters and in Related Systems , August 1973 , pp. 151 - 163
Copyright
Copyright © Reidel 1973

References

Arp, H., Brueckel, F., and Lourens, J. V. B.: 1963, Astrophys. J. 137, 228.CrossRefGoogle Scholar
Bergh, S. van den: 1967, Astron. J. 72, 70.CrossRefGoogle Scholar
Brooke, A. L.: 1969, Thesis, Australian National University.Google Scholar
Catchpole, R. M., Feast, M. W., and Menzies, J. W.: 1970, Observatory 90, 63.Google Scholar
Dickens, R.J., Feast, M.W., and Lloyd Evans, T.: 1972, Monthly Notices Roy. Astron. Soc, 159, 337.CrossRefGoogle Scholar
Eggen, O. J.: 1972, Astrophys. J. 172, 639.CrossRefGoogle Scholar
Feast, M. W.: 1972, Quart. J. Roy. Astron. Soc. 13, 191.Google Scholar
Feast, M. W. and Thackeray, A. D.: 1960, Monthly Notices Roy. Astron. Soc. 120, 463.CrossRefGoogle Scholar
Fourcade, C. R. and Laborde, J. R.: 1966, Atlas y Catálogo de Estrellas Variables en Cúmulos Globulares al sur de — 29°, Cordoba.Google Scholar
Hartwick, F. D. A. and Hesser, J. E.: 1972, Astrophys. J. 175, 77.CrossRefGoogle Scholar
Hartwick, F. D. A. and Sandage, A. R.: 1968, Astrophys. J. 153, 715.CrossRefGoogle Scholar
Hogg, H. S.: 1955, Publ. David Dunlap Obs. 2, 35.Google Scholar
Kron, G. E. and Smith, J. L.: 1951, Astrophys. J. 113, 324.CrossRefGoogle Scholar
Lloyd Evans, T. and Menzies, J. W.: 1971, Observatory 91, 35.Google Scholar
Osborne, W.: 1968, Observatory 88, 26.Google Scholar
Rosino, L.: 1962, Mem. Soc. Astr. Ital. 33, 351.Google Scholar
Sandage, A. R. and Katem, B.: 1964, Astrophys. J. 139, 1088.CrossRefGoogle Scholar
Sandage, A. and Smith, L. L.: 1966, Astrophys. J. 144, 894.CrossRefGoogle Scholar
Sandage, A. R. and Wallerstein, G.: 1960, Astrophys. J. 131, 598.CrossRefGoogle Scholar
Wildey, R. L.: 1961, Astrophys. J. 133, 430.CrossRefGoogle Scholar