Is the Sun located near the corotation circle?

Details Is the Sun located near the corotation circle? Is the Sun located near the corotation circle?

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..775m&link_type=abstract

Astronomy and Astrophysics, v.323, p.775-780

Astronomy and Astrophysics

Astrophysics

45

Galaxy: Kinematics And Dynamics, Structure, Cepheids

Scientific paper

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 {OMEGA}sun_=~26.0km/s/kpc (Kerr & Lynden-Bell, 1986MNRAS.221.1023K; Dambis, Mel'nik & Rastorguev, 1995AL.....21..291D) is close to that of the spiral pattern {OMEGA}_p_=~28.1+/-2.0km/s/kpc and the corotation radius R_c_=~7.2+/-1.3kpc (we adopt the galactocentric distance of the Sun Rsun_=~7.5kpc); 2) the spiral pitch angle i=~-6.8+/-0.7°; 3) the Sun is at the spiral wave phase χsun_=~290+/-16°; 4) Oort's constant A=~20.9+/-1.2km/s/kpc; the second term in the expansion of the galactic rotation velocity is Rsun_OMEGAsun_^=~13.3+/-3.1km/s/kpc^2^.

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