The Shape and Scale of Galactic Rotation from Cepheid Kinematics

Details The Shape and Scale of Galactic Rotation from Cepheid Kinematics The Shape and Scale of Galactic Rotation from Cepheid Kinematics

1997-10-06

arxiv.org/abs/astro-ph/9710055v1

Astronomy and Astrophysics

Astrophysics

36 pages, LaTeX, 10 figures

Scientific paper

10.1086/300198

A catalog of Cepheid variables is used to probe the kinematics of the Galactic disk. Radial velocities are measured for eight distant Cepheids toward l = 300; these new Cepheids provide a particularly good constraint on the distance to the Galactic center, R_0. We model the disk with both an axisymmetric rotation curve and one with a weak elliptical component, and find evidence for an ellipticity of 0.043 +/- 0.016 near the Sun. Using these models, we derive R_0 = 7.66 +/- 0.32 kpc and v_circ = 237 +/- 12 km/s. The distance to the Galactic center agrees well with recent determinations from the distribution of RR Lyrae variables, and disfavors most models with large ellipticities at the solar orbit.

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