Revisiting the Sun's Galactic Orbit

Details Revisiting the Sun's Galactic Orbit Revisiting the Sun's Galactic Orbit

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.0805i&link_type=abstract

American Astronomical Society, DDA meeting #38, #8.05

Astronomy and Astrophysics

Astronomy

Scientific paper

A galactic mass model is used with density (rho)0 = 0.10 M0/pc3, R0 = 7.6 kpc, and V0 = 200 km/sec. The first of these numbers is now well determined, but the latter two still have 10-15% uncertainties. These uncertainties permit construction of a galactic mass model with multiple local resonances as in Kotoneva et al, 2005. A "conventional" solar orbit is computed, rather similar in plan to the Martian heliocentric orbit with a true vertical period exceeding the value at R0 by about 10%. If, however, a resonant bar is active, the resulting solar orbit (and all local stellar motions) will have a periodic perturbation. This work was supported by NSERC and York University.
Reference: Kotoneva, E., Innanen, K.A., Dawson, P., De Robertis, M.M., and Wood, P.R., A&A 438, 957-962, 2005.

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