2 citations · 4 across the 7 of their papers we have counts for
7 papers
A comprehensive study of the eclipsing binaries V1241 Tau and GQ Dra
B. Ulas, K. Gazeas, A. Liakos +5
We present new photometric and spectroscopic observations and analyses for the eclipsing binary systems V1241 Tau and GQ Dra. Our photometric light and radial velocity curves analy…
A study of Variability of the Marginal Am star HD 176843 observed in the Kepler field
C. Ulusoy, I. Stateva, B. Ulaş +4
We present results of a study of the variability of the marginal Am star HD\,176843 observed in the {\it Kepler} field. {\it Kepler} photometry and ground-based spectroscopy are us…
The observed temperature distribution of contact binaries derived from SDSS photometry
Alexander Kurtenkov, Mirela Napetova
Data from the VSX, SDSS DR12, and Gaia DR2 catalogs were combined in order to explore the observed temperature distribution of known contact binaries. Color-temperature relations w…
Ori and Lib: Two new massive heartbeat binaries
Andrzej Pigulski, Monika K. Kaminska, Krzysztof Kaminski +28
We report the discovery of two massive eccentric systems with BRITE data, Ori and Lib, showing heartbeat effects close to the periastron passage. Lib exhibits shallow e…
Photometric and spectroscopic variability of 53 Per
E. Niemczura, A. Pigulski, H. Lehmann +4
A new investigation of the variability of the SPB-type star 53 Per is presented. The analysis of the BRITE photometry allowed us to determine eight independent frequencies and the…
Asteroseismology of the {\it Kepler} target KIC\,9204718
C. Ulusoy, I. Stateva, I. Kh. Iliev +2
The high precision data obtained by the {\it Kepler} satellite allows us to detect hybrid type pulsator candidates more accurately than the data obtained by ground-based observatio…
ESpeRo: Echelle Spectrograph Rozhen
Tanyu Bonev, Haralambi Markov, Toma Tomov +11
In this paper we describe the echelle spectrograph of the 2 meter telescope of the Rozhen National Astronomical Observatory. The spectrograph is a cross-dispersed, bench-mounted, f…