Milky Way rotation and the distance to the galactic center from Cepheid variables

Details Milky Way rotation and the distance to the galactic center from Cepheid variables Milky Way rotation and the distance to the galactic center from Cepheid variables

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1090c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1090-1105.

Astronomy and Astrophysics

Astronomy

135

Cepheid Variables, Galactic Rotation, Milky Way Galaxy, Astronomical Photometry, Interstellar Extinction, Metallicity, Stellar Magnitude

Scientific paper

The compiled photometry, reddenings, and radial velocities of Galactic Cepheids are fit with an axisymmetric Galactic rotation model. R0 = 7.8±0.7 kpc and 2AR0 = 228±19 km s-1 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-1 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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