Z. Eker
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View article: Kinematics of Cataclysmic Variables in the Solar Neighborhood in the Gaia Era
Kinematics of Cataclysmic Variables in the Solar Neighborhood in the Gaia Era Open
Using high-precision astrometric data from Gaia DR3 and updated systemic velocities from the literature, the kinematical properties of cataclysmic variables (CVs) were investigated. By constraining the data according to the total space vel…
View article: Fundamentals of Stars: A Critical Look at Mass-Luminosity Relations and Beyond
Fundamentals of Stars: A Critical Look at Mass-Luminosity Relations and Beyond Open
Developments on various relations among stellar variables such as the main sequence empirical mass-luminosity (MLR), massradius (MRR) and mass-effective temperature (MTR) relations were reviewed. Conceptual changes in their understanding a…
View article: Fundamentals of Stars: Critical Looks at Mass-Luminosity Relations and Beyond
Fundamentals of Stars: Critical Looks at Mass-Luminosity Relations and Beyond Open
Developments on various relations among stellar variables such as the main sequence empirical mass-luminosity (MLR), mass-radius (MRR) and mass-effective temperature (MTR) relations were reviewed. Conceptual changes in their understanding …
View article: CCD UBV and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605
CCD UBV and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605 Open
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the pyUPMASK algorithm on Gaia astrometric data to estimate cluster member…
View article: CCD UBV and Gaia DR3 Analyses of Open Clusters King 6 and NGC 1605
CCD UBV and Gaia DR3 Analyses of Open Clusters King 6 and NGC 1605 Open
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the pyUPMASK algorithm on Gaia astrometric data to estimate cluster member…
View article: Testing Multiband (G, GBP, GRP, B, V and TESS) Standard Bolometric Corrections by Recovering Luminosity and Radii of 341 Host Stars
Testing Multiband (G, GBP, GRP, B, V and TESS) Standard Bolometric Corrections by Recovering Luminosity and Radii of 341 Host Stars Open
Main-sequence bolometric corrections (BC) and a standard BC-Teff relation are produced for TESS wavelengths using published physical parameters and light ratios from SED models of 209 detached double-lined eclipsing binaries. This and prev…
View article: A Silent Revolution in Fundamental Astrophysics
A Silent Revolution in Fundamental Astrophysics Open
Arbitrariness in the zeropoint of bolometric corrections is a paradigm that is nearly a century old and leads to two more paradigms. “Bolometric corrections must always be negative,” and “the bolometric magnitude of a star ought to be brig…
View article: On the Interpretation of the Verse “We sent down Iron”
On the Interpretation of the Verse “We sent down Iron” Open
There is a phrase of “enzelnâ el-hadîd” in the 25th verse of the Sura al-Hadeed in Qur’an. This phrase is translated as “Iron was sent down” as a literal meaning. The purpose of this study is to investigate the literal meaning of the phras…
View article: A Method of Improving Standard Stellar Luminosities with Multiband Standard Bolometric Corrections
A Method of Improving Standard Stellar Luminosities with Multiband Standard Bolometric Corrections Open
Standard luminosity ($L$) of 406 main-sequence stars with the most accurate astrophysical parameters are predicted from their absolute magnitudes and bolometric corrections at Johnson $B,V$, and Gaia EDR3 $G$, $G_{BP}$, $G_{RP}$ filters. R…
View article: Physical properties of the trans-Neptunian object (38628) Huya from a multi-chord stellar occultation
Physical properties of the trans-Neptunian object (38628) Huya from a multi-chord stellar occultation Open
Context. As part of our international program aimed at obtaining accurate physical properties of trans-Neptunian objects (TNOs), we predicted a stellar occultation by the TNO (38628) Huya of the star Gaia DR2 4352760586390566400 ( m G = 11…
View article: Orbital Period Changes in IO Cep, IM Cep and TX Ari: Path to Masses of Distant Components
Orbital Period Changes in IO Cep, IM Cep and TX Ari: Path to Masses of Distant Components Open
Three Algol-type binary systems (IO Cep, IM Cep and TX Ari) showing cyclic orbital period changes are studied. The combination of time of minimum data from the ground-based observations together with high precision photometric data from th…
View article: Standard stellar luminosities: what are typical and limiting accuracies in the era after <i>Gaia</i>?
Standard stellar luminosities: what are typical and limiting accuracies in the era after <i>Gaia</i>? Open
Methods of obtaining stellar luminosities (L) have been revised and a new concept, standard stellar luminosity, has been defined. In this paper, we study three methods: (i) a direct method from radii and effective temperatures; (ii) a meth…
View article: On the zero point constant of the bolometric correction scale
On the zero point constant of the bolometric correction scale Open
Arbitrariness attributed to the zero-point constant of the V-band bolometric corrections (BCV) and its relation to ‘bolometric magnitude of a star ought to be brighter than its visual magnitude’ and ‘bolometric corrections must always be n…
View article: Empirical bolometric correction coefficients for nearby main-sequence stars in the <i>Gaia</i> era
Empirical bolometric correction coefficients for nearby main-sequence stars in the <i>Gaia</i> era Open
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 of 0.008 ≤ Z ≤ 0.040. Stellar parameters, light ratios, Gaia Dat…
View article: ASAS census of twins
ASAS census of twins Open
Twin binaries were identified among the eclipsing binaries with δ > –30° listed in the All Sky Automated Survey (ASAS) catalogue. In addition to the known twin binaries in the literature, 68 new systems have been identified and photomet…
View article: Interrelated main-sequence mass–luminosity, mass–radius, and mass–effective temperature relations
Interrelated main-sequence mass–luminosity, mass–radius, and mass–effective temperature relations Open
Absolute parameters of 509 main-sequence stars selected from the components\nof detached-eclipsing spectroscopic binaries in the Solar neighbourhood are\nused to study mass-luminosity, mass-radius and mass-effective temperature\nrelations …
View article: Active binary R Arae revisited: Bringing the secondary component to light and physical modelling of the circumstellar material
Active binary R Arae revisited: Bringing the secondary component to light and physical modelling of the circumstellar material Open
The spectral lines of the secondary component of the active binary system R Ara were uncovered for the first time, which allowed directly to determine the parameters of the spectroscopic orbit. The mass ratio of the system is updated to a …