Search Publications
On a New Technique for Discovering Variable Stars
Mironov, A. V.; Zakharov, A. I.; Nikolaev, F. N.
A technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.
High Precision with the Whole Earth Telescope: Lessons and Some Results from XCov20 for the roAp Star HR 1217
Kepler, S. O.; Kawaler, S. D.; Winget, D. E. +41 more
HR 1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of nonradial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 mu Hz and 34.6 mu Hz, with a sixth mode at a problematic spacing of 50.0 mu Hz (which equals 1.5 times 33.3 mu Hz) to the h…
Calibration of the Strömvil Photometric System
Sperauskas, J.; Straižys, V.; Boyle, R. P. +4 more
A calibration of color indices of the Strömvil photometric system in terms of physical parameters of stars is presented. The calibration is based on photoelectric photometry of about 1000 stars with known effective temperatures, distances, gravities and metallicities. The observations were accomplished in 2000--2003 with the 1.5 meter telescope of…
Classification of Metal-Deficient Dwarfs in the Vilnius Photometric System
Bartkevičius, A.; Bartašiūtė, S.; Lazauskaitė, R.
Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes. The new classification scheme is applied to a sample of Population II visual binaries.