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.
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References
Gum, C. S. and de Vaucouleurs, G. 1953, Observatory 73, 152.
Sandage, A. and Tammann, G. A. 1974, Astrophys. J. 191, 603.
de Vaucouleurs, G. 1978a, Astrophys. J. 224, 14.
de Vaucouleurs, G. 1978b, Astrophys. J. 223, 730.
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© 1989 Springer-Verlag New York, Inc.
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Moss, C., Irwin, M.J. (1989). The Magellanic Irregular Galaxy DDO 50. In: Corwin, H.G., Bottinelli, L. (eds) The World of Galaxies. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9356-6_14
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DOI: https://doi.org/10.1007/978-1-4613-9356-6_14
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4613-9358-0
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