Publications (14)
Study of Eclipsing Binary and Multiple Systems in OB Associations IV: Cas OB6 Member DN Cas
V. Bakis, H. Bakis, S. Bilir +1
An early-type, massive, short-period () eclipsing spectroscopic binary DN Cas has been re-visited with new spectral and photometric data. The masses a…
CCD UBV Photometry and Kinematics of the Open Cluster NGC 225
S. Bilir, Z. F. Bostanci, T. Yontan +6
We present the results of CCD photometric and spectroscopic observations of the open cluster NGC 225. In order to determine the structural parameters of NGC 225, we calculate…
Absolute Dimensions and Apsidal Motion of the Young Detached System LT Canis Majoris
V. Bakis, I. Bulut, S. Bilir +3
New high resolution spectra of the short period (P~1.76 days) young detached binary LT CMa are reported for the first time. By combining the results from the analysis of new radial…
Interrelated Main-Sequence Mass-Luminosity, Mass-Radius and Mass-Effective Temperature Relations
Z. Eker, V. Bakis, S. Bilir +7
Absolute parameters of 509 main-sequence stars selected from the components of detached-eclipsing spectroscopic binaries in the Solar neighbourhood are used to study mass-luminosit…
On the Zero Point Constant of the Bolometric Correction Scale
Z. Eker, V. Bakis, F. Soydugan +1
Arbitrariness attributed to the zero point constant of the band bolometric corrections () and its relation to "bolometric magnitude of a star ought to be brighter than it…
Study of Eclipsing Binary and Multiple Systems in OB Associations V: MQ Cen in Crux OB1
V. Bakis, Z. Mikulasek, J. Janik +6
The early-type massive binary MQ Cen (P=3.7 d) has been investigated by means of high-resolution () spectral analysis and multi-band (Johnson and Strö…
Absolute Dimensions and Apsidal Motion of the Eccentric Binary V731 Cephei
V. Bakis, M. Zejda, I. Bulut +7
A detailed analysis of new and existing photometric, spectroscopic and spatial distribution data of the eccentric binary V731 Cep was performed. Spectroscopic orbital elements of t…
Standard stellar luminosities; what are typical and limiting accuracies in the era after Gaia?
Z. Eker, F. Soydugan, S. Bilir +1
Methods of obtaining stellar luminosities (L) have been revised and a new concept, standard stellar luminosity, has been defined. Among the three methods (direct method from radii…
A Silent Revolution in Fundamental Astrophysics
Z. Eker, F. Soydugan, V. Bakis +2
Arbitrariness in the zero point of bolometric corrections is a nearly century-old paradigm leading to two more paradigms. "Bolometric corrections must always be negative," and "bol…
Study of Eclipsing Binary and Multiple Systems in OB Associations II. The Cygnus OB Region: V443 Cyg, V456 Cyg and V2107 Cyg
V. Bakis, H. Hensberge, S. Bilir +6
Three presumably young eclipsing binary systems in the direction of the Cygnus OB1, OB3 and OB9 associations are studied. Component spectra are reconstructed and their orbits are d…
Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon
H. Bakis, V. Bakis, S. Bilir +5
All available photometric and spectroscopic observations were collected and used as the basis of a detailed analysis of the close binary IM Mon. The orbital period of the binary wa…
The Spectroscopic Orbits of Three Double-lined Eclipsing Binaries: I. BG Ind, IM Mon, RS Sgr
V. Bakis, H. Bakis, S. Bilir +7
We present the spectroscopic orbit solutions of three double-lines eclipsing binaries, BG Ind, IM Mon and RS Sgr. The first precise radial velocities (RVs) of the components were d…
Empirical Bolometric Correction Coefficients for Nearby Main-Sequence Stars in Gaia Era
Z. Eker, F. Soydugan, S. Bilir +6
Nearby detached double-lined eclipsing binaries with most accurate data were studied and 290 systems were found with at least one main-sequence component having a metallicity $0.00…
Fundamentals of Stars II: Revisiting Bolometric Corrections
Z. Eker, V. Bakis
The development line of bolometric corrections within the brief history of photometry was described from the perspective of the Kuhnian philosophy of science. The luminous efficien…