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Browsing by Author "Kalomeni, Belinda"
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Absolute properties of the binary system BB pegasi
Kalomeni, Belinda; Yakut, Kadri; Keskin, Varol; Değirmenci, Ömer Lütfi; Ulaş, B.; Köse, O. (American Astronomical Society, 2007-08)We present ground-based photometry of the low-temperature contact binary BB Peg. We collected all the times of mid-eclipse available in the literature and combined them with those obtained in this study. Analyses of the ... -
Angular momentum loss by magnetic braking and gravitational radiation in relativistic binary stars
Yakut, Kadri; Kalomeni, Belinda; Tout, C. A. (International Conference Recent Advances in Natural Language Processing, RANLP, 2008)Angular momentum loss (AML) mechanisms and dynamical evolution owing to magnetic braking and gravitational radiation in relativistic binary stars (RBS) are studied with use of physical parameters collected from the literature. ... -
Angular momentum loss in polars
Kalomeni, Belinda (Cambridge University Press, 2009-08)We discuss the possible angular momentum loss mechanisms in AM Her type cataclysmic variables and their corresponding mass loss rates using the observed physical parameters of them. -
The anticorrelated nature of the primary and secondary eclipse timing variations for the kepler contact binaries
Tran, K.; Levine, A.; Rappaport, S.; Borkovits, T.; Csizmadia, Sz.; Kalomeni, Belinda (IOP Publishing, 2013-09)We report a study of the eclipse timing variations in contact binary systems, using long-cadence lightcurves from the Kepler archive. As a first step, observed minus calculated (O-C) curves were produced for both the primary ... -
Basic physical properties of the low-temperature contact binary system V781 Tau and the near-contact binary system V836 Cyg
Yakut, Kadri; Ulaş, Burak; Kalomeni, Belinda; Gülmen, Ömür (Oxford University Press, 2005-11)We present a detailed photometric study of the low-temperature contact binary V781 Tau, and the near-contact binary V836 Cyg. We have combined the parameters obtained from the light-curve analysis with those found by the ... -
Close binary and other variable stars in the solar-age galactic open cluster M67
Yakut, Kadri; Zima, W.; Kalomeni, Belinda; Van Winckel, H.; Wealkens, C.; De Cat, P.; Bauwens, E.; Vučković, M.; Saesen, S.; Le Guillou, L.; Parmaksızoğlu, M.; Uluç, K.; Khamitov, I.; Raskin, G.; Aerts, C. (EDP Sciences, 2009-08)We present multi-colour time-series CCD photometry of the solar-age galactic open cluster M67 (NGC 2682). About 3600 frames spread over 28 nights were obtained with the 1.5 m Russian-Turkish and 1.2 m Mercator telescopes. ... -
Close binary system GO Cyg
Ulaş, Burak; Kalomeni, Belinda; Keskin, Varol; Köse, O.; Yakut, Kadri (Elsevier, 2012-04)In this study, we present long term photometric variations of the close binary system GO Cyg. Modelling of the system shows that the primary is filling Roche lobe and the secondary of the system is almost filling its Roche ... -
Cyclotron emission from accretion plasma columns in magnetic cataclysmic variable stars
Kalomeni, Belinda; Pekünlü, Esat Rennan; Yakut, Kadri (EDP Sciences, 2005-09)Pure cyclotron spectra of polars produced during their low accretion states are deduced. We used the working hypothesis that the cyclotron emission is produced by electrons spiraling down the dipole magnetic field lines ... -
Evolution of binaries towards HMXBs and LMXBs
Kalomeni, Belinda (American Institute of Physics Publising, 2011)In this study we investigate the evolution of binary systems towards low mass x-ray binaries and high mass x-ray binaries using Eggleton's binary star evolution code. © 2011 American Institute of Physics. -
Long-term monitoring of polars
Kalomeni, Belinda (Cambridge University Press, 2011-07)We present long-term observations of magnetic cataclysmic variables AM Her, AN UMa, AR UMa, DP Leo, and V1309 Ori obtained with the ROTSEIIId telescope. All data have been analysed and preliminary results indicate periods ... -
Magnetic cataclysmic variables
Kalomeni, Belinda (American Institute of Physics Publising, 2010)We present a study on magnetic cataclysmic variables (polars) using the collected data from the literature. These parameters (mass, radius, magnetic field intensity, mass transfer rate, etc.) and the relations between them ... -
Marginally low mass ratio close binary system V1191 Cyg
Ulaş, B.; Kalomeni, Belinda; Keskin, Varol; Köse, O.; Yakut, Kadri (Elsevier, 2012-01)In this study, we present photometric and spectroscopic variations of the extremely small mass ratio (q ≃ 0.1) late-type contact binary system V1191 Cyg. The parameters for the hot and cooler companions have been determined ... -
Possible disintegrating short-period super-mercury orbiting KIC 12557548
Rappaport, S.; Levine, A.; Chiang, E.; El Mellah, I.; Jenkins, J.; Kalomeni, Belinda; Kite, E. S.; Kotson, M.; Nelson, L.; Rousseau-Nepton, L.; Tran, K. (IOP Publishing, 2012-06)We report on the discovery of stellar occultations, observed with Kepler, which recur periodically at 15.685 hr intervals, but which vary in depth from a maximum of 1.3% to a minimum that can be less than 0.2%. The star ... -
Short and long time-scale variability in magnetic cataclysmic variables: Long-term monitoring of polars
Kalomeni, Belinda (Oxford University Press, 2012-05)We present long-term observations of the magnetic cataclysmic variables AM Her, AN UMa, AR UMa, DP Leo and V1309 Ori. Analyses of both short- and long-period light variations are presented. For the first time, as far as ... -
The short-period low-mass binary system CC Com revisited
Köse, O; Kalomeni, Belinda; Keskin, Varol; Ulaş, Burak; Yakut, Kadri (Wiley-VCH Verlag, 2011-07)In this study we determined precise orbital and physical parameters of the very short-period low-mass contact binary system CC Com. The parameters are obtained by analysis of new CCD data combined with archival spectroscopic ... -
Triple-star candidates among the Kepler binaries
Rappaport, S.; Deck, K.; Levine, A.; Borkovits, T.; Carter, J.; El Mellah, I.; Sanchis-Ojeda, R.; Kalomeni, Belinda (IOP Publishing, 2013-05)We present the results of a search through the photometric database of Kepler eclipsing binaries looking for evidence of hierarchical triple-star systems. The presence of a third star orbiting the binary can be inferred ...
