Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-30T02:39:11.575Z Has data issue: false hasContentIssue false
  • English
  • Français

Narrow-Band Photometry of Red Variables in Globular Clusters

Published online by Cambridge University Press:  12 April 2016

Robert F. Wing
Robert F. Wing*
Affiliation:
Perkins Observatory, The Ohio State and Ohio Wesley an Universities, Ohio, U.S.A.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Fourteen red variables in the southern globular clusters 47 Tuc, ω Cen, and NGC 362 have been observed on an eight-color system of narrow-band photometry in the near infrared. Temperatures are derived from blackbody fits to the calibrated fluxes, and spectral types are given for the M stars. The types observed for the three Mira variables in 47 Tuc range from M3.1 to M7.5; two small-range variables in the same cluster are later than M4. The variables in ω Cen are mostly earlier than K5, but spectra of types M3 and MO were also encountered among radial-velocity members. In both the metal-rich 47 Tuc and the metal-poor ω Cen, the relation between TiO band strength and temperature is approximately normal. Several of these stars fall well above or below the red giant branches of their clusters in diagrams of infrared magnitude against temperature. Comparisons are made with recent results obtained at Radcliffe Observatory on some of the same stars.

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. 164 - 177
Copyright
Copyright © Reidel 1973

References

Arp, H. C.: 1965, in Blaauw, A. and Schmidt, M. (eds.), Galactic Structure, University of Chicago Press, Chicago, p. 401.Google Scholar
Arp, H. C., Brueckel, F., and Lourens, J. v. B.: 1963, Astrophys. J. 137, 228.CrossRefGoogle Scholar
Dickens, R. J.: 1972, Monthly Notices Roy. Astron. Soc, 159, 7p..CrossRefGoogle Scholar
Dickens, R. J., Feast, M. W., and Lloyd Evans, T.: 1972, Monthly Notices Roy. Astron. Soc, 159, 337.CrossRefGoogle Scholar
Eggen, O. J.: 1961, Roy. Observ. Bull., No. 29.Google Scholar
Eggen, O. J.: 1972, Astrophys. J. 172, 639.CrossRefGoogle Scholar
Feast, M. W.: 1965, Observatory 85, 16.Google Scholar
Feast, M. W.: 1972, Quart. J. Roy. Astron. Soc. 13, 191.Google Scholar
Feast, M. W.: 1973, in Fernie, J. D. (ed.), Variable Stars in Globular Clusters and in Related Systems, D. Reidel Pub. Co., Dordrecht, Holland, p. 131.CrossRefGoogle Scholar
Feast, M. W. and Thackeray, A. D.: 1960, Monthly Notices Roy. Astron. Soc. 120, 463.CrossRefGoogle Scholar
Fourcade, C. R., Laborde, J. R., and Albarracin, J.: 1966, Atlas y Catálogo de Estrellas Variables en Cúmulos Globulares al Sur de — 29°, Córdoba.Google Scholar
Geyer, E. H.: 1967, Z. Astrophys. 66, 16.Google Scholar
Harding, G. A.: 1962, Observatory 82, 205.Google Scholar
Joy, A. H.: 1949, Astrophys. J. 110, 105.CrossRefGoogle Scholar
Lloyd Evans, T. and Menzies, J. W.: 1973, in Fernie, J. D. (ed.), Variable Stars in Globular Clusters and in Related Systems, D. Reidel Pub. Co., Dordrecht, Holland, p. 151.CrossRefGoogle Scholar
Lockwood, G. W.: 1972, Astrophys. J. Suppl. 24, No. 209, 375.CrossRefGoogle Scholar
Lockwood, G. W. and Wing, R. F.: 1971, Astrophys. J. 169, 63.CrossRefGoogle Scholar
Sawyer Hogg, H. B.: 1973, Publ. David Dunlap Obs. 3, No.6, in press.Google Scholar
Spinrad, H. and Wing, R. F.: 1969, Ann. Rev. Astron. Astrophys. 7, 249.CrossRefGoogle Scholar
Stock, J. and Wing, R. F.: 1972, Bull. Am. Astron. Soc. 4, 324.Google Scholar
Tifft, W. G.: 1963, Monthly Notices Roy. Astron. Soc. 126, 209.CrossRefGoogle Scholar
White, N. M.: 1972, in Hack, M. (ed.), Colloquium on Supergiant Stars, Trieste, p. 160.Google Scholar
Wildey, R. L.: 1961, Astrophys. J. 133, 430.CrossRefGoogle Scholar
Wing, R. F.: 1967a, in Hack, M. (ed.), Colloquium on Late-Type Stars, Trieste, p. 205.Google Scholar
Wing, R. F.: 1967b, Doctoral dissertation, University of California, Berkeley.Google Scholar
Wing, R. F.: 1971, in Lockwood, G. W. and Dyck, H. M. (eds.), Proceedings of the Conference on Late-Type Stars, Kitt Peak National Observatory Contribution No. 554, Tuscon, p. 145.Google Scholar
Wing, R. F.: 1973, in preparation.Google Scholar
Wing, R. F. and Keenan, P. C.: 1973, in preparation.Google Scholar
Wing, R. F. and Stock, J.: 1973, in press.Google Scholar
Wing, R. F., Warner, J. W., and Smith, M. G.: 1973, Astrophys. J., 179, 135.CrossRefGoogle Scholar
Woolley, R. v. d. R.: 1966, Roy. Observ. Ann. No. 2.Google Scholar