34 citations · 206 across the 25 of their papers we have counts for
25 papers
Precise physical and kinematical parameters of massive eclipsing binaries in the Small Magellanic Cloud
M. Kaya, Ö. Çakırlı, B. Hoyman +3
The formation of massive stars serves an important field of study, requiring research into whether these stars need to form together within clusters of low-mass stars or if they ar…
Unravelling Mass Transfer in Algols from Surface Abundances. I. Z Vulpeculae
Ahmet Dervişoğlu, Simge Adalalı, Ferhat Güney +7
The photospheric abundance pattern of the components is a sensitive probe of mass and angular momentum transfer in Algols. With the aim to trace the evolutionary history and disclo…
Selected Cephei pulsators in eclipsing binaries
O. Cakirli, B. Hoyman, O. Ozdarcan +1
We present a comprehensive analysis of five eclipsing binary systems containing Cephei-type pulsating components. These systems were identified using the high-precision Transit…
Exploring the empirical instability strip for Dor-type stars in eclipsing binaries
O. Cakirli, B. Hoyman, O. Ozdarcan +1
This research paper has light curve modelling, spectroscopy, and detailed asteroseismic studies for five detached eclipsing binaries with a Dor component that have been found s…
V2653 Ophiuchii with a pulsating component and Ppuls-Porb, Ppuls-g correlations for gamma-Dor type pulsators
Ö. Çakırlı, C. Ibanoglu
We present new spectroscopic observations of the double-lined eclipsing binary V2653\,Oph. The photometric observations obtained by were analysed and combined with the analy…
A comprehensive study of the open cluster NGC 6866
Z. F. Bostanci, T. Ak, T. Yontan +15
We present CCD photometry of the field of the open cluster NGC 6866. Structural parameters of the cluster are determined utilizing the stellar density profile of the stars…
The early B-type eclipsing binary GT\,Cephei: a massive triple system?
Ö. Çakırlı
GT\,Cep is a semi-detached close binary system with an orbital period of 4.91 days, containing a massive star. I have obtained spectroscopic observations and derived radial velocit…
Complex Analysis of the Stellar Binary V446\,Cep; A New Massive Eclipsing Binary in Cepheus\,OB2 Association
Ö. Çakırlı, C. Ibanoglu, E. Sipahi +2
We present new spectroscopic observations of the early type, double-lined eclipsing binary V446\,Cep. The radial velocities and the photometric data obtained by were an…
Analysis of the Massive Eclipsing Binary V1441\,Aql
O. Cakirli, C. Ibanoglu, E. Sipahi +2
We present new spectroscopic observations of the early type, double-lined eclipsing binary V1441\,Aql. The radial velocities and the available photometric data obtained by i…
V745\,Cassiopeia: an interacting young massive binary in a multiple star system
O. Cakirli, C. Ibanoglu, E. Sipahi
We present spectroscopic observations of the massive early type system V745\,Cas, embedded in a multiple star system. The brightest star of the system is the eclipsing binary V745\…
MY Serpentis: a high-mass triple system in the Ser OB2 association
C. Ibanoglu, O. Cakirli, E. Sipah
We present spectroscopic observations of the massive multiple system HD\,167971, located in the open cluster NGC\,6604. The brighter component of the triple system is the overconta…
Spectroscopic observations of the interacting massive binary AQ\,Cassiopea
C. Ibanoglu, O. Cakirli, E. Sipahi
New spectroscopic observations of the double-lined eclipsing binary AQ\,Cas are presented. All available spectroscopic and photometric observations have been analysed for the funda…
The mass and radius of the M-dwarf companion in the double-lined eclipsing binary T-Cyg1-01385
O. Cakirli, C. Ibanoglu, E. Sipahi
We observed spectroscopically the eclipsing binary system T-Cyg1-01385 in order to determine physical properties of the components. The double-lined nature of the system is reveale…
NSVS07394765: A new low-mass eclipsing binary below 0.6 M_sun
Ö. Çakirli
The multi-color photometric and spectroscopic (based on observations obtained with the T{Ü}B{İ}TAK National Observatory 1.5-meter telescope, which is owned and operated by the T{Ü}…
TYC 1031 1262 1: An Anomalous Cepheid in a double-lined eclipsing binary
E. Sipahi, C. Ibanoglu, O. Cakirli +1
Multi-color light curves and radial velocities for TYC\,1031\,1262\,1 have been obtained and analyzed. TYC\,1031\,1262\,1 includes a Cepheid with a period of 4.152700.00061 da…
T-Cyg1-12664: A low-mass chromospherically active eclipsing binary in the Kepler field
O. Cakirli, C. Ibanoglu, E. Sipahi
The eclipsing binary T-Cyg1-12664 was observed both spectroscopically and photometrically. Radial velocities of both components and ground-based VRI light curves were obtained. The…
Photometric and spectroscopic observations of the F3+M3 eclipsing binary T-Lyr0-08070
O. Cakirli, C. Ibaoglu, E. Sipahi
The multi-color photometric and spectroscopic observations of the newly discovered eclipsing binary T-Lyr0-08070 were obtained. The resultant light and radial velocities were analy…
Carbon deficiencies in the primaries of some classical Algols
C. Ibanoglu, A. Dervisoglu, O. Cakirli +2
The equivalent widths of C II 4267 Åline were measured for the mass-gaining primary stars of the 18 Algol-type binary systems. The comparison of the EWs of the gainers with tho…
Absolute properties of the neglected eclipsing B-type binary HD 194495
Ömür Çakirli, Esin Sipahi, Cafer İbanoğlu
We present the results of the high-resolution spectroscopic observations of the neglected binary system HD\,194495 (B3\,IV-V+B4\,V). A combined analysis of three different photomet…
Differential rotation on the young solar analogue V889 Herculis
Zsolt Kovari, Antonio Frasca, Katia Biazzo +3
V889 Herculis is one of the brightest single early-G type stars, a young Sun, that is rotating fast enough (P_rot =1.337 days) for mapping its surface by Doppler Imaging. The 10 FO…
The Absolute Parameters for NSVS 11868841 and the Oversized Stars in the Low-Mass Eclipsing Binaries
Ö. Çakırlı, C. Ibanoğlu, A. Dervişoğlu
Spectroscopic observations of the low-mass eclipsing binary NSVS 11868841 have been obtained and the radial velocities were derived for both components. The masses and radii determ…
Photospheric and chromospheric activity on the young solar-type star HD 171488
A. Frasca, K. Biazzo, Zs. Kovari +2
We present the results of contemporaneous spectroscopic and photometric monitoring of the young solar-type star HD171488 (Prot~1.337 d) aimed at studying surface inhomogeneities at…
Is NP Aqr a new near-contact binary?
C. Ibanoglu, O. Cakirli, A. Dervisoglu
We present radial velocities of the double-lined spectroscopic binary NP Aqr. The radial velocities and the optical light curves obtained by Hipparcos and ASAS-3 are analyzed separ…
NSVS06507557; a low-mass double-lined eclipsing binary
O. Cakirli, C. Ibanoglu
In this paper we present the results of a detailed spectroscopic and photometric analysis of the V=13.4 low-mass eclipsing binary NSVS 06507557 with an orbital period of 0.515…