S. Bilir
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View article: Selected <i>β</i> Cephei pulsators in eclipsing binaries
Selected <i>β</i> Cephei pulsators in eclipsing binaries Open
We present a comprehensive analysis of five eclipsing binary systems containing $\beta$ Cephei-type pulsating components. These systems were identified using high-precision Transiting Exoplanet Survey Satellite photometry and complemented …
View article: Selected $β$ Cephei pulsators in eclipsing binaries
Selected $β$ Cephei pulsators in eclipsing binaries Open
We present a comprehensive analysis of five eclipsing binary systems containing $β$ Cephei-type pulsating components. These systems were identified using the high-precision Transiting Exoplanet Survey Satellite (TESS) photometry and comple…
View article: A Comprehensive Study of Czernik 41 and NGC 1342 Using CCD <i>UBV</i> and Gaia DR3 Data
A Comprehensive Study of Czernik 41 and NGC 1342 Using CCD <i>UBV</i> and Gaia DR3 Data Open
In this study, the structural, astrophysical, kinematic, and Galactic orbital parameters of the open clusters Czernik 41 and NGC 1342, as well as their dynamical evolution, are investigated using CCD UBV photometry and Gaia data. By applyi…
View article: A Multidata Approach to Open Clusters: Roslund 3 and Ruprecht 174 in CCD <i>UBV</i> and Gaia DR3 Context
A Multidata Approach to Open Clusters: Roslund 3 and Ruprecht 174 in CCD <i>UBV</i> and Gaia DR3 Context Open
A detailed analysis of the structural, astrophysical, kinematic, and dynamical properties of the open clusters Roslund 3 and Ruprecht 174 is carried out using CCD UBV photometry in conjunction with astrometric and photometric data from Gai…
View article: Stellar Ancestry Unlocked: Chemical and Orbital Clues Link Metal-poor Stars to Globular Clusters and the Galaxy’s Thick Disk
Stellar Ancestry Unlocked: Chemical and Orbital Clues Link Metal-poor Stars to Globular Clusters and the Galaxy’s Thick Disk Open
This study presents a detailed chemical, kinematic, and orbital dynamic analysis of five metal-poor stars in the solar neighborhood: HD 2665, HD 5916, HD 122956, HD 189349, and HD 218857. Using high-resolution spectroscopic data from the E…
View article: A Multi-Data Approach to Open Clusters: Roslund 3 and Ruprecht 174 in CCD UBV and Gaia DR3 Context
A Multi-Data Approach to Open Clusters: Roslund 3 and Ruprecht 174 in CCD UBV and Gaia DR3 Context Open
A detailed analysis of the structural, astrophysical, kinematic, and dynamical properties of the open clusters Roslund 3 and Ruprecht1 74 is carried out using CCD UBV photometry in conjunction with astrometric and photometric data from Gai…
View article: Tracing the Galactic Origins of Selected Four G-type Stars in the Solar Neighborhood
Tracing the Galactic Origins of Selected Four G-type Stars in the Solar Neighborhood Open
We present a multimethod investigation of four metal-poor G-type main-sequence stars to resolve their Galactic origins. By combining high-resolution spectroscopy from PolarBase, photometric/astrometric data from Gaia DR3, and spectral ener…
View article: Tracing the Galactic Origins of Selected Four G-type Stars in the Solar Neighbourhood
Tracing the Galactic Origins of Selected Four G-type Stars in the Solar Neighbourhood Open
We present a multi-method investigation of four metal-poor G-type main-sequence stars to resolve their Galactic origins. By combining high-resolution spectroscopy from PolarBase, photometric/astrometric data from Gaia DR3, and spectral ene…
View article: Exploring the empirical instability strip for $γ$ Dor-type stars in eclipsing binaries
Exploring the empirical instability strip for $γ$ Dor-type stars in eclipsing binaries Open
This research paper has light curve modelling, spectroscopy, and detailed asteroseismic studies for five detached eclipsing binaries with a $γ$ Dor component that have been found so far by the sky surveys. The objective is to study the pul…
View article: Exploring the empirical instability strip for γ Dor-type stars in eclipsing binaries
Exploring the empirical instability strip for γ Dor-type stars in eclipsing binaries Open
This research paper has light-curve modelling, spectroscopy, and detailed asteroseismic studies for five detached eclipsing binaries with a $\gamma$ Dor component that have been found so far by the sky surveys. The objective is to study th…
View article: Structural Parameters of the Thin Disk Population from Evolved Stars in the Solar Neighborhood
Structural Parameters of the Thin Disk Population from Evolved Stars in the Solar Neighborhood Open
This study investigates the structural parameters of the thin-disk population by analyzing the spatial distribution of evolved stars in the solar neighborhood. From the Gaia Data Release 3 database, about 39.1 million stars within 1 kpc an…
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: Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn
Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn Open
In this study, we present a detailed analysis of CN Lyn, an overlooked triple star system, by combining spectroscopic data from the literature, photometric Transiting Exoplanet Survey Satellite data, and kinematic techniques. We updated th…
View article: Structural Parameters of the Thin Disk Population from Evolved Stars in Solar Neighborhood
Structural Parameters of the Thin Disk Population from Evolved Stars in Solar Neighborhood Open
This study investigates the structural parameters of the thin-disk population by analyzing the spatial distribution of evolved stars in the solar neighbourhood. From the $\it Gaia$ Data Release 3 database, about 39.1 million stars within 1…
View article: Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn
Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn Open
In this study we present a detailed analysis of CN Lyn, an overlooked triple star system, by combining spectroscopic data from the literature, photometric \textit{TESS} data, and kinematic techniques. We updated the fundamental parameters …
View article: Near-infrared Spectroscopy of the Sun and Solar Analog Star HD 76151: Compiling an Extensive Line List in the Y, J, H, and K Bands
Near-infrared Spectroscopy of the Sun and Solar Analog Star HD 76151: Compiling an Extensive Line List in the Y, J, H, and K Bands Open
Determining the physical nature of a star requires precise knowledge of its stellar atmospheric parameters, including effective temperature, surface gravity, and metallicity. This study presents a new atomic line list covering a broad spec…
View article: Near-Infrared Spectroscopy of the Sun and Solar Analog Star HD 76151: Compiling an Extensive Line List in Y-, J-, H-, and K-Bands
Near-Infrared Spectroscopy of the Sun and Solar Analog Star HD 76151: Compiling an Extensive Line List in Y-, J-, H-, and K-Bands Open
Determining the physical nature of a star requires precise knowledge of its stellar atmospheric parameters, including effective temperature, surface gravity, and metallicity. This study presents a new atomic line list covering a broad spec…
View article: Cover Picture: Astron. Nachr. 8/2024
Cover Picture: Astron. Nachr. 8/2024 Open
Vector‐Point Diagrams (left panels) and proper‐motion component vectors (right panels) for identified member stars in the open clusters Ruprecht 1 and Ruprecht 171. These two previously little‐studied open clusters, both at a distance of a…
View article: Hyperfine Structure Investigation of Singly Ionized Thulium in Fourier-transform Spectra
Hyperfine Structure Investigation of Singly Ionized Thulium in Fourier-transform Spectra Open
The hyperfine structure of 40 spectral lines of singly ionized thulium (Tm ii ) in emission spectra from a hollow cathode discharge lamp measured with a Fourier transform spectrometer in the wavelength range from 335 to 2345 nm has been in…
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: Updated Absolute Parameters and Kinematics of IS CMa
Updated Absolute Parameters and Kinematics of IS CMa Open
Eclipsing binary systems are significant objects for astrophysics in that direct observations can determine the fundamental parameters of stars. In this study, we determined precisely the fundamental parameters of the binary component star…
View article: Hyperfine Structure Investigation of Singly Ionized Thulium in FT Spectra
Hyperfine Structure Investigation of Singly Ionized Thulium in FT Spectra Open
The hyperfine structure of 40 spectral lines of singly ionized thulium (Tm II) in emission spectra from a hollow cathode discharge lamp measured with a Fourier transform spectrometer in the wavelength range from 335 nm to 2345 nm has been …
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: An Updated Line List for Spectroscopic Investigation of G Stars- I: Redetermination of the Abundances in the Solar Photosphere
An Updated Line List for Spectroscopic Investigation of G Stars- I: Redetermination of the Abundances in the Solar Photosphere Open
We propose a line list that may be useful for the abundance analysis of G-type stars in the wavelength range 4080 – 6780 Å. It is expected that the line list will be useful for surveys/libraries with overlapping spectral regions (e.g. ELOD…
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: An Updated Line List for Spectroscopic Investigation of G Stars- I: Redetermination of the Abundances in the Solar Photosphere
An Updated Line List for Spectroscopic Investigation of G Stars- I: Redetermination of the Abundances in the Solar Photosphere Open
We propose a line list that may be useful for the abundance analysis of G-type stars in the wavelength range 4080 -- 6780 A. It is expected that the line list will be useful for surveys/libraries with overlapping spectral regions (e.g. ELO…
View article: A Chandra X-ray Study of Supernova Remnant N63A in the Large Magellanic Cloud
A Chandra X-ray Study of Supernova Remnant N63A in the Large Magellanic Cloud Open
We perform extensive spectroscopy of the supernova remnant N63A in the Large Magellanic Cloud, using $\sim 43$ ks {\it Chandra} archival data. By analysing the spectra of the entire remnant, we determine the abundance distributions for O, …
View article: Galactic Model Parameters and Spatial Density of Cataclysmic Variables in the Gaia Era: New Constraints on Population Models
Galactic Model Parameters and Spatial Density of Cataclysmic Variables in the Gaia Era: New Constraints on Population Models Open
The spatial distribution, Galactic model parameters, and luminosity function of cataclysmic variables (CVs) are established using reestimated trigonometric parallaxes from Gaia DR3. The data sample of 1587 CVs in this study is claimed to b…