Astrophysics and Space Science

, Volume 94, Issue 2, pp 253–272 | Cite as

Variable stars in NGC 6397

  • H. M. H. El-Worfaly
  • E. Budding


Thirty-four deep sky plates of NGC 6397 taken from AAO, UKSTU and SAAO sources were examined with the aim of checking parameters of (3) known variables in the cluster, and also to discover new and generally fainter (Main-Sequence) variables.

The search methods have included various visual and automated procedures, a comparison of which provides another aspect of the present work.

At least two faint variables have been identified, one of which (V4) was reported previously during this same search. The other object (C74) was ‘detected’ by the COSMOS machine and confirmed by visual inspection. A number of other candidates for genuine stellar variability are presented.


Visual Inspection Search Method Automate Procedure Variable Star Stellar Variability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Alcaino, G.: 1973,Atlas of Galactic Globular Clusters, Univ. Cathol. de Chile (publ.), p. 65.Google Scholar
  2. Alexander, M. E. and Budding, E.: 1979,Astron. Astrophys. 73, 227.Google Scholar
  3. Allen, C. W.: 1973,Astrophysical Quantities, (3rd ed.), Athlone Press, London, p. 196.Google Scholar
  4. Bailey, S. I.: 1902,Ann. Harvard Coll. Obs. 38.Google Scholar
  5. Bailey, S. I.: 1923,Harvard Bull., No. 796.Google Scholar
  6. Budding, E.: 1978,Observatory 98, 208.Google Scholar
  7. Budding, E.: 1982, in F. D. Kahn (ed.),Investigating the Universe, D. Reidel Publ. Co., Dordrecht, Holland, p. 271.Google Scholar
  8. Budding, E. and Henshaw, C.: 1979,Inf. Bull. Var. Stars, No. 1621.Google Scholar
  9. Cannon, R. D.: 1974,Monthly Notices Roy. Astron. Soc. 167, 551.Google Scholar
  10. Cannon, R. D.: 1981,Monthly Notices Roy. Astron. Soc. 195, 1.Google Scholar
  11. Eggen, O. J.: 1960,Monthly Notices Roy. Astron. Soc. 119, 115.Google Scholar
  12. El-Worfaly, H. M. H.: 1980, M. Sc. Thesis, Manchester University (unpublished).Google Scholar
  13. Feast, M. W.: 1965,Observatory 85, 16.Google Scholar
  14. Fernie, J. D. (ed.): 1973, in ‘Variable Stars in Globular Clusters an Related Systems’,IAU Colloq. 21.Google Scholar
  15. Graham, J. A. and Doremus, C.: 1968,Astron. J. 73, 226.Google Scholar
  16. Hanes, D. and Madore, B. (eds.): 1980,Globular Clusters, NATO Adv. Study Institute, Cambridge University Press, Cambridge, England.Google Scholar
  17. Hesser, J. E. (ed.): 1980, ‘Star Clusters’,IAU Symp. 85.Google Scholar
  18. Johnson, H. L.: 1963, in K. A. Strand (ed.),Basic Astronomical Data, Univ. Chicago Press, p. 204.Google Scholar
  19. Kukarkin, B. V., Kholopov, P. N., Efremov, Y. N., Kukarkina, P. N., Kurochkin, N. E., Medvedeva, G. I., Perova, N. B., Pskovskii, Y. P., Fedorovich, B. P., and Frolov, M. S.: 1971,First Supplement to Third Edition of General Catalogue of Variable Stars, Moscow.Google Scholar
  20. Liller, M. H.: 1978,Inf. Bull. Var. Stars, No. 1527.Google Scholar
  21. MacGillivray, H. T., Martin, R., Pratt, N. M., Peddish, V. C., Seddon, H., Alexander, L. W. G., Walker, G. S., and Williams, P. R.: 1976,Monthly Notices Roy. Astron. Soc. 176, 265.Google Scholar
  22. Niss, B., Jørgensen, H. E., and Lansten, S.: 1978,Astron. Astrophys. Suppl. Ser. 32, 387.Google Scholar
  23. Peterson, C. J. and King, I. R.: 1975,Astron. J. 80, 427.Google Scholar
  24. Pratt, N. M.: 1977, in A. Beer (ed.),Vistas in Astron. 21, 1, Pergamon Press, Oxford.Google Scholar
  25. Sawyer-Hogg, H. B.: 1973a,A Third Catalogue of Variable Stars in Globular Clusters, No. 6.Google Scholar
  26. Sawyer-Hogg, H. B.: 1973b, in J. D. Fernie (ed.), ‘Variable Stars in Globular Clusters and Related Systems’,IAU Colloq. 21, 3.Google Scholar
  27. Sawyer-Hogg, H. B. and Shapley, H.: 1931,Harvard Circ., No. 366.Google Scholar
  28. Searle, L. and Rodgers, A. W.: 1965,Astrophys. J. 147, 809.Google Scholar
  29. Shapley, H.: 1930, in ‘Star Clusters’,Harvard Obs. Mon., No. 2Google Scholar
  30. Shapley, H. and Sawyer, H. B.: 1929,Harvard Bull., No. 896.Google Scholar
  31. Swope, H. H. and Greenbaum, I.: 1952,Astron. J. 57, 83.Google Scholar
  32. Webbink, R. F.: 1980, in M. J. Plavec, D. M. Popper, and R. K. Ulrich (eds.), ‘Close Binary Stars: Observations and Interpretation’,IAU Symp. 88, 561.Google Scholar
  33. Woolley, van der R., Alexander, J. B., Mather, L., and Epps, E.: 1961,Roy. Observ. Bull., No. 43.Google Scholar

Copyright information

© D. Reidel Publishing Co 1983

Authors and Affiliations

  • H. M. H. El-Worfaly
    • 1
  • E. Budding
    • 1
  1. 1.Department of AstronomyUniversity of ManchesterEngland

Personalised recommendations