Cepheids radial velocities and coordinates (Mishurov+ 1997)

Details Cepheids radial velocities and coordinates (Mishurov+ 1997) Cepheids radial velocities and coordinates (Mishurov+ 1997)

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ycat..33230775m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/323/775. Originally published in: 1997A&A...323..775M

Physics

Radial Velocities

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 Rc=~7. 2+/-1.3kpc (we adopt the galactocentric distance of the Sun R&sun;=~7.5kpc); 2) the spiral pitch angle i=~-6.8+/-0.7°; 3) the Sun is at the spiral wave phase χ&sun;=~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 R&sun;{OMEGA}&sun;=~13.3+/- 3.1km/s/kpc2. (1 data file).

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