6 papers
Astrometric Binaries in the Age of the Next Generation of Large (Space) Telescopes
Rob P. Olling
I analyze several catalogs of known visual and spectroscopic binaries and conclude that a large number of binaries is missing in current catalogs. Samples of the best studied (near…
Galaxy Distances via Rotational Parallaxes
R. P. Olling, D. M. Peterson
Accurate distances to stars and galaxies allow for significant tests of stellar evolution, galaxy formation and evolution and cosmology. NASA's Space Interferometry Mission (SIM) w…
Refining the Oort Constants: the case for a smaller Milky Way
Rob P. Olling, Michael R. Merrifield
The local stellar kinematics of the Milky Way, parameterized by the Oort constants A and B, depend on the local gradient of the rotation curve, its absolute value (Theta_0), and th…
The Shape of the Milky Way's Dark Halo
R. P. Olling, M. R. Merrifield
The distribution of shapes of galaxies' dark halos provides a basic test for models of galaxy formation. To-date, few dark halo shapes have been measured, and the results of differ…
The Flattened Dark Matter Halos of NGC 4244 and the Milky Way
Rob P. Olling
In a previous paper (Paper I) a method was developed to determine the shapes of dark matter halos of spiral galaxies from the flaring and velocity dispersion of the gas layer. Here…
The Flattened Dark Matter Halo of NGC 4244
Rob P. Olling
In a previous paper (Olling 1995, astro-ph/9505002) a method was developed to determine the shapes of dark matter halos of spiral galaxies from an accurate determination of the rot…