Variable Stars in Dwarf Spheroidal Galaxies

Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 36)


Interest in dwarf spheroidal galaxies is motivated by a number of reasons; an important one on the occasion of this colloquium is the abundance of variable stars. The theory of stellar evolution and stellar pulsations is now able to predict from theoretical considerations characteristic properties of variable stars in the colour-magnitude diagram (Iben, 1971). By observing the variable stars in the field, and in as wide a selection of objects as possible, more insight can be obtained into the history of the oldest members of our Galaxy (the globular clusters) and of the dwarf spheroidal galaxies in the Local Group. It is worthwhile to explore the spheroidal galaxies as observational tests for the theoretical predictions of conditions in space away from our Galaxy. The numbers of variable stars in the dwarf spheroidal galaxies are such that we may expect well-defined relations to emerge once reliable magnitude sequences have been set up, the variable stars found, and their periods determined. Six dwarf spheroidal galaxies are presently known in the Local Group within a distance of 250 kpc. In Table I, which lists members of the Local Group, they are at the low-luminosity end of the sequence of elliptical galaxies (van den Bergh, 1968).


Local Group Globular Cluster Dwarf Galaxy Variable Star Horizontal Branch 
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.


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  1. Agt, S. van and Oosterhoff, P.: 1959, Ann. Sterrew. Leiden 21, 253.Google Scholar
  2. Agt, S. van: 1967, Bull. Astron. Inst. Neth. 19, 275.ADSGoogle Scholar
  3. Baade, W. and Hubble, E.: 1939, Publ. Astron. Soc. Pacific 51, 40.ADSCrossRefGoogle Scholar
  4. Baade, W. and Swope, H.: 1961, Astron. J. 66, 300.ADSCrossRefGoogle Scholar
  5. Bergh, S. van den: 1968, J. Roy. Astron. Soc. Can. 62, 1.Google Scholar
  6. Bergh, S. van den: 1972a, Publ. David Dunlap Obs., No. 312.Google Scholar
  7. Bergh, S. van den: 1972b, Astrophys. J. Letters 171, L31.ADSCrossRefGoogle Scholar
  8. Demers, S.: 1972, J. Roy. Astron. Soc. Can. 66, 215.ADSGoogle Scholar
  9. Dessy, J.: 1959, Publ. Astron. Soc. Pacific 71, 435.ADSCrossRefGoogle Scholar
  10. Gent, H. van: 1933, Bull. Astron. Inst. Neth. 7, 21.ADSGoogle Scholar
  11. Hodge, P.: 1961, Astron. J. 66, 384.ADSCrossRefGoogle Scholar
  12. Hodge, P.: 1964, Astron. J. 69, 853.ADSCrossRefGoogle Scholar
  13. Hodge, P.: 1965, Astrophys. J. 142, 1390.ADSCrossRefGoogle Scholar
  14. Hodge, P. and Michie, R.: 1969, Astron. J. 74, 587.ADSCrossRefGoogle Scholar
  15. Holmberg, E.: 1969, Arkiv Astron. 5, 305.ADSGoogle Scholar
  16. Iben, I.: 1971, Astron. J. 83, 697.ADSGoogle Scholar
  17. Marchant, J. and Millikan, E.: 1965, J. Opt. Soc. Am. 55, 907.ADSGoogle Scholar
  18. Reaves, G.: 1956, Astron. J. 61, 69.ADSCrossRefGoogle Scholar
  19. Sandage, A.: 1954, Astron. J. 59, 162.ADSCrossRefGoogle Scholar
  20. Shapley, H.: 1938a, Harvard Bull. No. 908.Google Scholar
  21. Shapley, H.: 1938b, Nature 142, 715.ADSCrossRefGoogle Scholar
  22. Swope, H.: 1967, Publ. Astron. Soc. Pacific 79, 439.ADSCrossRefGoogle Scholar
  23. Swope, H.: 1968, Astron. J. Suppl. 73, 204.ADSGoogle Scholar
  24. Thackeray, A.: 1950a, Observatory 70, 144.ADSGoogle Scholar
  25. Thackeray, A.: 1950b, unpublished.Google Scholar
  26. Tifft, W.: 1963, Monthly Notices Roy. Astron. Soc. 126, 209.ADSGoogle Scholar
  27. Walker, M.: 1970, Astrophys. J. 161, 835.ADSCrossRefGoogle Scholar
  28. Wesselink, A.: 1965, Monthly Notices Roy. Astron. Soc. 130, 443.ADSGoogle Scholar
  29. Wilson, A.: 1955, Pub. Astron. Soc. Pacific 67, 27.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1973

Authors and Affiliations

  1. 1.University of NijmegenNijmegenThe Netherlands

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