Abstract
The compiled photometry, reddenings, and radial velocities of Galactic Cepheids are fit with an axisymmetric Galactic rotation model. R<SUB>0</SUB> = 7.8±0.7 kpc and 2AR<SUB>0</SUB> = 228±19 km s<SUP>-1</SUP> are derived. The LMC distance modulus is 18.45 on the same absolute calibration. Observed Cepheid γ velocities appear on average to be 3±1 km s<SUP>-1</SUP> more negative than the true corresponding center-of-mass velocities. The trend of increasing blueness toward larger Galactocentric radius confirms the radial metallicity gradient found spectroscopically.
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