Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58..984k&link_type=abstract
Astronomicheskii Zhurnal, vol. 58, Sept.-Oct. 1981, p. 984-995. In Russian.
Astronomy and Astrophysics
Astronomy
1
Cepheid Variables, Kinematics, Stellar Luminosity, Stellar Motions, Eccentricity, Galactic Rotation, Orbital Elements, Velocity Distribution
Scientific paper
A kinematic study of 75 classical Cepheids with known radial velocities, UBV photoelectric magnitudes, and proper motions is presented. The correction to the zero point of the period-luminosity relation by the statistical parallax method was -0.1m. An analysis of the Cepheid velocity field shows that the motions of 11 Cepheids in the longitude region of 90-180 deg and at r greater than 1.5 kpc disagree with the kinematic models adopted in the present study. After these stars are excluded, the velocity of galactic rotation was found to be increased to 19.3 km/s-kpc. Elements of the Cepheid box orbits were calculated, and about 70% of the stars were found to have eccentricities of e less than 0.1.
Karimova D. K.
Pavlovskaya E. D.
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