SIMBAD references

1998AJ....115..635M - Astron. J., 115, 635-647 (1998/February-0)

The shape and scale of galactic rotation from cepheid kinematics.


Abstract (from CDS):

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, R0. 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 R0 = 7.66 ± 0.32 kpc and vcirc = 237±12 km.s–1. 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.

Abstract Copyright:

Journal keyword(s): Stars: Variables: Cepheids - Galaxy: Fundamental Parameters - Galaxy: Kinematics and Dynamics - Galaxy: Structure

VizieR on-line data: <Available at CDS (J/AJ/115/635): table2.dat table5.dat>

Simbad objects: 312

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