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The Magellanic Irregular Galaxy DDO 50

  • C. Moss
  • M. J. Irwin
Conference paper

Abstract

The Magellanic irregular galaxy, DDO 50 (= Ho II = A 813+70 = VII Zw 223 = Arp 268), is usually assumed to be a member of the M 81 group. De Vaucouleurs (1979) has derived the distance modulus of the galaxy, μ o = 27.79, from magnitudes of the brightest blue supergiants and brightest red variable given by Sandage and Tammann (1974). The estimated absolute magnitude of the galaxy, M T = −17.04, is close to that of the SMC. We have used B and V plates to obtain a colour-magnitude diagram for this galaxy. We have also obtained further estimates of the distance modulus: first, from measurements of the sizes of H II rings in the galaxy from a deep Hα plate, and second, from a comparison of the luminosity function of the brightest blue stars with the corresponding luminosity function for the SMC.

Keywords

Luminosity Function Distance Modulus Versus Plate Distance Indicator Field Star 
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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References

  1. Gum, C. S. and de Vaucouleurs, G. 1953, Observatory 73, 152.ADSGoogle Scholar
  2. Sandage, A. and Tammann, G. A. 1974, Astrophys. J. 191, 603.ADSCrossRefGoogle Scholar
  3. de Vaucouleurs, G. 1978a, Astrophys. J. 224, 14.ADSCrossRefGoogle Scholar
  4. de Vaucouleurs, G. 1978b, Astrophys. J. 223, 730.ADSCrossRefGoogle Scholar
  5. de Vaucouleurs, G. 1979, Astrophys. J. 227, 380.ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag New York, Inc. 1989

Authors and Affiliations

  • C. Moss
    • 1
  • M. J. Irwin
    • 1
  1. 1.Institute of AstronomyCambridgeUK

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