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Kinematics of Hipparcos Visual Binaries. I. Stars with Orbital Solutions
Bartkevicius, A.; Gudas, A.
A sample consisting of 570 binary systems is compiled from several sources of visual binary stars with well-known orbital elements. High-precision trigonometric parallaxes (mean relative error about 5%) and proper motions (mean relative error about 3%) are extracted from the Hipparcos Catalogue or from the reprocessed Hipparcos data. However, 13% …
Stars with the Largest Hipparcos Photometric Amplitudes
Adelman, Saul J.
A list of the 2027 stars that have the largest photometric amplitudes in Hipparcos Photometry shows that most variable stars are all Miras. The percentage of variable types change as a function of amplitude. This compilation should also be of value to photometrists looking for relatively unstudied, but large amplitude stars.
Surface Photometry of Spiral Galaxies at Redshifts 0.15 to 1
Tamm, A.; Tenjes, P.
Using HST archive observations for three disk galaxies at redshifts z = 0.15, 0.90 and 0.99, and the astronomical data processing system IRAF/STSDAS, we derived their surface brightness profiles. Derived luminosity distributions were reduced to standard V and I magnitudes. After corrections for cosmological distortion (k-correction), the surface b…
On the Photometric Variability of Red Clump Giants
Adelman, Saul J.
Hipparcos photometry of the 308 red clump giants identified by Paczynski et al. (1999) is investigated. These stars are found to be quite stable during the three years of observation, but questions remain about longer term stability.