Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..220..201v&link_type=abstract
International Astronomical Union Symposium no. 220, held 21 - 25 July, 2003 in Sydney, Australia. Eds: S. D. Ryder, D. J. Pisano
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Using parallaxes and proper motions of a kinematically and spatially unbiased sample of old bright red giant stars from the Hipparcos catalog with measured radial velocities from Barbier-Brossat & Figon (2000), we have re-estimated the surface density of the Galactic disk in the solar neighbourhood within ± 0.4 kpc of the Sun. We determine the vertical distribution of the red giants as well as the vertical velocity dispersion of the sample, (14.4 ± 0.26 km/sec), and combine these to derive the surface density of gravitating matter in the Galactic disk. Using these data, we determine the surface density of the galactic disk as a function of the galactic coordinate, z. The surface density of the disk increases from 10.5 ± 0.5 M&sun;/pc^2 within ± 50 pc to 42 ± 6 M&sun;/pc^2 within ± 350 pc. The volume density of the galactic disk within ± 50 pc is 0.105 ± 0.005 M&sun;/pc^3, which is only marginally greater (within 2 sigma) than the volume density estimates of observed baryonic matter in the solar neighbourhood.
Borkova T. V.
Dinescu Dana I.
Girard Terrence M.
Korchagin Vladimir I.
van Altena William F.
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