3 papers
astro-ph.SR2020
Spectroscopic long-term monitoring of RZ Cas -- Part I: Basic stellar and system parameters
H. Lehmann, A. Dervisoglu, D. E. Mkrtichian +3
RZ Cas is a short-period Algol-type system showing episodes of mass transfer and Delta Sct-like oscillations of its mass-gaining primary component. We analyse high-resolution spect…
astro-ph.SR2018
The dynamical mass and evolutionary status of the type-II Cepheid in the eclipsing binary system OGLE-LMC-T2CEP-211 with a double-ring disk
Bogumił Pilecki, Ahmet Dervişoğlu, Wolfgang Gieren +5
We present the analysis of a peculiar W~Virginis (pWVir) type-II Cepheid, OGLE-LMC-T2CEP-211 (), in a double-lined binary system (), which shed l…
astro-ph.SR2011
V1898 Cygni: An interacting eclipsing binary in the vicinity of North America nebula
A. Dervisoglu, Ö. Çakırlı, C. Ibanoglu +1
We present spectroscopic observations of the double-lined early type eclipsing binary V1898\,Cyg. The radial velocities were obtained by means of the cross-correlation technique. A…