Is the Sun located near the corotation circle?
Yu.N. Mishurov 1,
I.A. Zenina 1,
A.K. Dambis 2,
A.M. Mel'nik 2 and
A.S. Rastorguev 2
Received 11 April 1996 / Accepted 30 October 1996
The line-of-sight velocity field of Cepheids was analysed in terms of a disk galaxy model perturbed by spiral density waves in order to estimate the parameters of the galactic rotation curve and the free parameters of density waves. It was shown that: 1) the Sun is located near the corotation circle because the angular rotation velocity of the Galaxy kpc-1 (Kerr & Lynden-Bell, 1986; Dambis, Mel'nik & Rastorguev, 1995) is close to that of the spiral pattern kpc-1 and the corotation radius kpc (we adopt the galactocentric distance of the Sun kpc); 2) the spiral pitch angle ; 3) the Sun is at the spiral wave phase ; 4) Oort's constant kpc-1 ; the second term in the expansion of the galactic rotation velocity is kpc-2.
Key words: Galaxy: kinematics and dynamics structure Cepheids
Send offprint requests to: Yu.N.Mishurov Table 2 is only available in electronic form at the CDS via anonymous ftp 18.104.22.168".
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998