Paper:	Cepheids and bright stars in NGC 3109
Volume:	4, The Extragalactic Distance Scale: Proceedings of the ASP 100th Anniversary Symposium
Page:	201
Authors:	Sandage, Allan R.; Carlson, George A.
Abstract:	Cepheid variables have been found in the nearby Sm IV galaxy NGC 3109. Periods determined for 29 of the variables range from 31 to 5 days. The period-luminosity relation yields an apparent blue distance modulus of (m-M)(AB) = 26.4. The brightest supergiants have absolute magnitudes of M(B)(3) = -7.6 for the mean of the three brightest blue stars, and M(V)(3) = -7.7 for the corresponding mean of the three brightest red stars. These absolute magnitudes for both the red and the blue supergiants in NGC 3109 agree with the previous calibration of the brightest star luminosities as a function of the absolute magnitude of the parent galaxy.

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