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The helium content of the peculiar Oosterhoff type I globular cluster ω Centauri

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Abstract

An investigation of the observational properties for RR Lyrae variables in the galactic globular cluster ω Centauri is reported. The results show that ω Centauri belongs to the Oosterhoff Group I, notwithstanding the large, Oo II-like value of the average of the periods of ab-type RR Lyrae. The helium content is derived for this cluster from the analysis of the variables in the (A-logT e) plane. It is shown that the helium abundance is very close to the value Y=0.30, about 0.05 larger than the value derived for the ‘normal’ Oo I globular cluster M3.

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References

  1. Bessell, M. S. and Norris, J.: 1976,Astrophys. J. 208, 369.

  2. Butler, D., Dickens, R. J. and Epps, E.: 1978,Astrophys. J. 225, 148.

  3. Caloi, V., Castellani, V. and Tornambè, A.: 1978,Astron. Astrophys. Suppl. 33, 169.

  4. Caputo, F. and Castellani, V.: 1975,Astrophys. Space Sci. 38, 39.

  5. Caputo, F., Castellani, V. and Tornambè, A.: 1978,Astron. Astrophys. 67, 107.

  6. Caputo, F., Castellani, V. and Tornambè, A.: 1980,Astron. Astrophys. 82, 79.

  7. Castellani, V. and Tornambè, A.: 1980, submitted toAstron. Astrophys.

  8. Castellani, V., Ponte, G. and Tornambè, A.: 1980,Astrophys. Space Sci. 73, 11.

  9. Dickens, R. J. and Bell, R. A.: 1976,Astrophys. J. 207, 506.

  10. Freeman, K. C. and Rodgers, A. W.: 1975,Astrophys. J. 201, L71.

  11. Norris, J. and Bessell, M. S.: 1977,Astrophys. J. 211, L91.

  12. Norris, J. and Bessell, M. S.: 1977,Astrophys. J. 211, L91.

  13. Rodgers, A. W., Freeman, K. C., Harding, P. and Smith, G. H.: 1979,Astrophys. J. 232, 169.

  14. Stellingwerf, R. F.: 1975,Astrophys. J. 195, 441.

  15. Sweigart, A. V. and Gross, P. G.: 1976,Astrophys. J. Suppl.32, 367.

  16. Tuggle, R. S. and Iben, I., Jr.: 1972,Astrophys. J. 178, 445.

  17. van Albada, T. S. and Baker, N. H.: 1971,Astrophys. J. 169, 311.

  18. van Albada, T. S. and Baker, N. H.: 1973,Astrophys. J. 185, 477.

  19. Wehlau, A. and Demers, S.: 1977,Astron. Astrophys. 57, 251.

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Caputo, F. The helium content of the peculiar Oosterhoff type I globular cluster ω Centauri. Astrophys Space Sci 76, 329–339 (1981). https://doi.org/10.1007/BF00687497

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Keywords

  • Helium
  • Globular Cluster
  • Observational Property
  • Helium Content
  • Helium Abundance