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Astron. Astrophys. 329, 514-521 (1998)


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Investigation of the kinematics of young disk populations

E.V. Glushkova, A.K. Dambis, A.M. Mel'nik and A.S. Rastorguev

Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899 Russia

Received 28 January 1997 / Accepted 28 April 1997

Abstract

We used both radial-velocity and proper-motion data to perform a rotation-curve solution on a combined sample of about 700 Population-I objects including young open clusters (lg A [FORMULA] 8.1), classical Cepheids, and red supergiants. The distances of all objects are derived on a homogenized scale based on Kholopov's (1980) ZAMS, [FORMULA], PL relation for classical Cepheids by Berdnikov & Efremov (1985), and the absolute-magnitude calibration for red supergiants involving photometric data in Wing's eight-color narrow-band near-infrared system. We inferred [FORMULA] = 7.3 [FORMULA] 0.3 kpc for the distance of the Sun to the Galactic center and found the following parameters of the solar apex and Galactic rotation curve: [FORMULA] = 8.8 [FORMULA] 0.9 km s-1, [FORMULA] = 13.5 [FORMULA] 0.9 km s-1, [FORMULA] = 11.7 [FORMULA] 1.5 km s-1, [FORMULA] = 27.3 [FORMULA] 2.0 km s-1 kpc-1, A = 19.5 [FORMULA] 0.5 km s-1 kpc-1, and [FORMULA] = 1.13 [FORMULA] 0.12 km s-1 kpc-3. These values are in good agreement with the results of our analysis of the radial-velocity and proper-motion fields of classical Cepheids (Dambis et al. 1995).

Key words: Galaxy: kinematics and dynamics – open clusters and associations – Cepheids – supergiants – Galaxy: structure – Galaxy: fundamental parameters

© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997
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