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10 papers · 1 filter
A massive binary black-hole system in OJ287 and a test of general relativity
M. J. Valtonen, H. J. Lehto, K. Nilsson +23
Tests of Einstein's general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Ne…
New absolute magnitude calibrations for W Ursa Majoris type binaries
Z. Eker, S. Bilir, E. Yaz +2
Parallaxes of W UMa stars in the Hipparcos catalogue have been analyzed. 31 W UMa stars, which have the most accurate parallaxes () which are neither associated with a…
New absolute magnitude calibrations for detached binaries
S. Bilir, T. Ak, E. Soydugan +6
Lutz-Kelker bias corrected absolute magnitude calibrations for the detached binary systems with main-sequence components are presented. The absolute magnitudes of the calibrator st…
A catalog of chromospherically active binary stars (third edition)
Z. Eker, N. Filiz Ak, S. Bilir +8
Chromospherically Active Binaries (CAB) catalogue have been revised and updated. With 203 new identifications, the number of CAB stars is increased to 409. Catalogue is available i…
Formation and Evolution of W UMa Stars: Fallacies and Corrections
Z. Eker, O. Demircan, S. Bilir
The period histograms of eclipsing binaries generated with ASAS data cannot only be interpreted by orbital evolution. The eclipse probabilities, selection effects and space distrib…
Spatial distribution and galactic model parameters of cataclysmic variables
T. Ak, S. Bilir, S. Ak +1
The spatial distribution, galactic model parameters and luminosity function of cataclysmic variables (CVs) in the solar neighbourhood have been determined from a carefully establis…