Galactic kinematics derived from classical Cepheids.

Details Galactic kinematics derived from classical Cepheids. Galactic kinematics derived from classical Cepheids.

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999acaps..19..272z&link_type=abstract

Acta Astrophys. Sin., Vol. 19, No. 3, p. 272 - 280

Astronomy and Astrophysics

Astrophysics

Galaxy: Kinematics, Galaxy: Cepheids, Solar Motion

Scientific paper

On the basis of radial velocity and Hipparcos proper motion data, the author has analyzed the galactic kinematics of classical Cepheids. Using the 3-D Ogorodnikov-Milne model he has determined the rotational velocity of the Galaxy to be V0 = 240.5±10.2 km/s, on assuming a galactocentric distance of the Sun of R0 = 8.5 kpc. The results clearly indicate a contracting motion in the solar neighbourhood of (θVθ/θθ)/R = -2.60±1.07 km s-1kpc-1, along the direction of galactic rotation. Possible reason for this motion is discussed. The solar motion found here is Ssun = 18.78±0.86 km/s in the direction lsun = 54.4°±2.9° and bsun = +26.6°±2.6°.

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