Milky Way rotation and the distance to the Galactic center from Cepheid variables
The existing data on Milky Way Cepheids are fitted with an axisymmetric Galactic rotation model. A new “standard candle” mo is determined: the unreddened apparent magnitude of a hypothetical Cepheid with standard period, color, and metallicity at a distance of 1 Ro. It then follows that Ro = 7.8 ± 0.7 kpc from the cluster Cepheid zero point. Further important results are that 2AR0 = 228 ± 19 km s−1, and that the observed Cepheid mean velocities average 3.1 ± 0.9 km s−1 too negative compared with the center-of-mass velocities.
KeywordsRadial Velocity Rotation Curve Galactic Center Galactic Plane Standard Candle
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