Search Publications
New photometric analysis of hot Jupiter: WASP-135b
Erdem, Ahmet; Öztürk, Oğuz
We report photometric follow-up observations of WASP-135b obtained using the 1.23-m telescope at Calar Alto Observatory and 1.00-m telescope at TÜBİTAK National Observatory during the 2017 and 2018 observational seasons. Eight new transit light curves of WASP-135b were analyzed with JKTEBOP code. The ratio of the planet radius to radius of host st…
AB Andromedae - An overcontact eclipsing binary
Nelson, Robert H.
In an effort to resolve the discrepancy between two earlier studies, new radial velocity and photometric data have been obtained and analyzed by Roche modelling for AB Andromedae, an overcontact W-subtype eclipsing binary. The new values for the basic data, m1 = 0.60 (3) Mʘ, m2 = 1.14 (3) Mʘ, R1
Irregular emission cycles in the Oe star HD 60 848
Nazé, Yaël; Fló, Joan Guarro; Rauw, Gregor +2 more
We analyse the spectroscopic and photometric variability of the Oe star HD 60 848 over the last twenty five years. The spectra reveal recurrent, but irregular cycles of increased circumstellar emission lines. These cycles are highly asymmetric displaying a slow increase over about 6 years, followed by a fast decay within about 6 months. Our analys…
KIC 4762887: A near-contact binary or an ellipsoidal variable star?
Liu, Liang; Li, Xu-Zhi
KIC 4762887 is a variable star with a very small amplitude discovered by Kepler and show the EW-type light curve. We analyzed the light curve of KIC 4762887 by using the 2015 version of the Wilson-Devinney code. The results indicated that it is not a contact binary, maybe not even an eclipsing binary. We also modelled the light curve by the Fourie…
The Overcontact Binary BO Arietis
Nelson, Robert H.
New radial velocity and photometric data for BO Ari have been obtained, and Roche-based simultaneous analysis of RV and light curve data for the system has been accomplished using the 2003 version of the Wilson-Devinney code. Values for the masses and radii have been obtained: M1 = 1.34 (2) Mʘ, M2 = 0.26 (1) M…
The late-type detached binary du Leonis
Nelson, Robert H.
New radial velocity and photometric data for DU Leonis have been obtained, and Roche-based simultaneous analysis of RV and light curve data for DU Leo has been accomplished for the first time, using the 2003 and 2015 versions of the Wilson-Devinney code. Values for the masses and radii have been obtained: M1 = 0.937 (5) Mʘ, M…
The curvature emission model of peculiar isolated neutron star 2XMM J104608.7-594306
Chkheidze, N.; Machabeli, G.; Kevlishvili, N.
In the present paper we construct non-thermal emission theory, interpreting the observational properties of a newly discovered pulsar 2XMM J104608.7-594306 in X-rays that is believed to be thermally emitting isolated neutron star. A different approach of curvature emission scenario is considered, giving the spectral energy distribution that is in …
The Detached Binary TW Coronae Borealis
Nelson, Robert H.
New radial velocity and photometric data for TW CrB have been obtained, and Roche-based simultaneous analysis of RV and light curve data for the system has been accomplished for the first time, using the 2003 version of the Wilson-Devinney code. Values for the masses and radii have been obtained: M1 = 1.31 (6) Mʘ, M2
The Detached Binary V887 Persei
Nelson, Robert H.
New radial velocity and photometric data for V887 Persei have been obtained, and Roche-based simultaneous analysis of RV and light curve data for V887 Per has been accomplished for the first time, using the 2003 version of the Wilson-Devinney code. Masses and stellar radii have been determined: M1 = 1.77 (4) Mʘ, M 2