Kinematics of RR Lyrae stars based on HIPPARCOS proper motions

Details Kinematics of RR Lyrae stars based on HIPPARCOS proper motions Kinematics of RR Lyrae stars based on HIPPARCOS proper motions

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..599w&link_type=abstract

In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have derived the galactic space velocities of 130 RR Lyrae stars, using proper motions measured by Hipparcos. The distances of the stars are taken from a photometric calibration which is confirmed by Hipparcos parallaxes. We present the mean velocities and the velocity dispersions of the RR Lyrae stars as a function of the metallicity [Fe/H]. The data do not allow to decide safely whether the kinematical properties of halo and disk objects show a smooth transition or whether halo and disk stars belong to two distinct populations. The difference in the mean motions of metal-poor and metal-rich RR Lyrae stars is in good agreement with a circular velocity of about 220 km/s at the Sun. Adopting such a circular velocity, the system of metal-poor RR Lyrae stars shows no significant net rotation in our Galaxy. The metal-rich RR Lyrae stars move like typical disk stars.

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