D. Graczyk
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View article: Fundamental effective temperature measurements for eclipsing binary stars – VII. The solar twin in LL Aquarii
Fundamental effective temperature measurements for eclipsing binary stars – VII. The solar twin in LL Aquarii Open
The eclipsing binary LL Aqr is a bright V = 9.32, detached system consisting of two solar-type stars in an eccentric orbit (P = 20.2 d). The secondary component, LL Aqr B, was previously found to have physical and atmospheric parameters ve…
View article: Period–luminosity relations for Galactic Type II Cepheids in the Sloan bands
Period–luminosity relations for Galactic Type II Cepheids in the Sloan bands Open
Context. Type II Cepheids (T2Ceps), alongside RR Lyrae stars, serve as important distance indicators for old Population II stars due to their period–luminosity (PL) relations. However, few studies of these relations in the Sloan photometri…
View article: Toward Early-type Eclipsing Binaries as Extragalactic Milestones. IV. Physical Properties of Three Detached O/B-type Systems in the LMC
Toward Early-type Eclipsing Binaries as Extragalactic Milestones. IV. Physical Properties of Three Detached O/B-type Systems in the LMC Open
We present a complete set of physical parameters for three early-type eclipsing binary systems in the Large Magellanic Cloud (LMC): OGLE LMC-ECL-17660, OGLE LMC-ECL-18794, and HV 2274, together with the orbital solutions. The first and thi…
View article: Surface brightness-colour relations of dwarf stars from detached eclipsing binaries
Surface brightness-colour relations of dwarf stars from detached eclipsing binaries Open
Aims . Surface brightness-colour relations (SBCRs) are useful tools for predicting the angular diameters of stars. They offer the possibility to calculate precise spectrophotometric distances based on the eclipsing binary method or the Baa…
View article: Toward early-type eclipsing binaries as extragalactic milestones: IV. Physical properties of three detached O/B-type systems in the LMC
Toward early-type eclipsing binaries as extragalactic milestones: IV. Physical properties of three detached O/B-type systems in the LMC Open
We present a complete set of physical parameters for three early-type eclipsing binary systems in the Large Magellanic Cloud (LMC): OGLE LMC-ECL-17660, OGLE LMC-ECL-18794, and HV 2274, together with the orbital solutions. The first and thi…
View article: Precise physical parameters of three late-type eclipsing binary giant stars in the Large Magellanic Cloud
Precise physical parameters of three late-type eclipsing binary giant stars in the Large Magellanic Cloud Open
Context. Detached eclipsing binaries (DEBs) allow for the possibility of a precise characterization of their stellar components. They offer a unique opportunity for deriving their physical parameters nearly independent of a model for a num…
View article: Period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars in the Sloan bands
Period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars in the Sloan bands Open
RR Lyrae stars are excellent tracers of the old population II due to their period-luminosity (PL) and period-luminosity-metallicity (PLZ) relations. While these relations have been investigated in detail in many photometric bands, there ar…
View article: Period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars in the Sloan bands
Period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars in the Sloan bands Open
Context. RR Lyrae stars are excellent tracers of the old population II due to their period-luminosity (PL) and period-luminosity-metallicity (PLZ) relations. While these relations have been investigated in detail in many photometric bands,…
View article: Toward Early-type Eclipsing Binaries as Extragalactic Milestones. III. Physical Properties of the O-type Eclipsing Binary OGLE LMC-ECL-21568 in a Quadruple System* <sup>,</sup> †
Toward Early-type Eclipsing Binaries as Extragalactic Milestones. III. Physical Properties of the O-type Eclipsing Binary OGLE LMC-ECL-21568 in a Quadruple System* <sup>,</sup> † Open
We present the results from a complex study of an eclipsing O-type binary (Aa+Ab) with the orbital period of P A = 3.2254367 days that forms part of a higher-order multiple system in a configuration of (A+B)+C. We derived masses of the Aa+…
View article: The orbital parameters of the <i>δ</i> Cep inner binary system determined using 2019 HARPS-N spectroscopic data <i>(Corrigendum)</i>
The orbital parameters of the <i>δ</i> Cep inner binary system determined using 2019 HARPS-N spectroscopic data <i>(Corrigendum)</i> Open
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View article: Cepheids with giant companions
Cepheids with giant companions Open
Context. Binary Cepheids with giant companions are crucial for studying the physical properties of Cepheid variables, in particular providing the best means to measure their masses. Systems composed of two Cepheids are even more important,…
View article: Towards early-type eclipsing binaries as extragalactic milestones: III. Physical properties of the O-type eclipsing binary OGLE LMC-ECL-21568 in a quadruple system
Towards early-type eclipsing binaries as extragalactic milestones: III. Physical properties of the O-type eclipsing binary OGLE LMC-ECL-21568 in a quadruple system Open
We present the results from a complex study of an eclipsing O-type binary (Aa+Ab) with the orbital period $P_{A}=3.2254367$ days, that forms part of a higher-order multiple system in a configuration (A+B)+C. We derived masses of the Aa+Ab …
View article: The orbital parameters of the del Cep inner binary system determined using 2019 HARPS-N spectroscopic data
The orbital parameters of the del Cep inner binary system determined using 2019 HARPS-N spectroscopic data Open
An inner companion has recently been discovered orbiting the prototype of classical Cepheids, delta Cep, whose orbital parameters are still not fully constrained. We collected new precise radial velocity measurements of delta Cep in 2019 u…
View article: The orbital parameters of the<i>δ</i>Cep inner binary system determined using 2019 HARPS-N spectroscopic data
The orbital parameters of the<i>δ</i>Cep inner binary system determined using 2019 HARPS-N spectroscopic data Open
Context. An inner companion has recently been discovered orbiting the prototype of classical Cepheids, δ Cep, whose orbital parameters are still not fully constrained. Aims. We collected new precise radial velocity measurements of δ Cep in…
View article: Period–Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands*
Period–Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands* Open
We present the first period–luminosity (PL) and period–Wesenheit (PW) relations in the Sloan–Pan-STARRS g P 1 r P 1 i P 1 bands for classical fundamental-mode Cepheids in the Milky Way. We used a relatively modest number of 76 stars for th…
View article: New Near-infrared Period–Luminosity–Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes
New Near-infrared Period–Luminosity–Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes Open
We present new period–luminosity and period–luminosity–metallicity relations for Galactic RR Lyrae stars based on a sample of 28 pulsators located at distances of up to 1.5 kpc from the Sun. Near-infrared photometry was obtained at the Cer…
View article: Period-Luminosity Relations for Galactic classical Cepheids in the Sloan bands
Period-Luminosity Relations for Galactic classical Cepheids in the Sloan bands Open
We present the first period-luminosity (PL) and period-Wesenheit (PW) relations in the Sloan-Pans-STARRS gP1rP1iP1 bands for classical fundamental mode Cepheids in the Milky Way. We used a relatively modest number of 76 stars for the PL an…
View article: New Near-Infrared Period-Luminosity-Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes
New Near-Infrared Period-Luminosity-Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes Open
We present new period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars based on a sample of 28 pulsators located at distances up to $1.5$ kpc from the Sun. Near-infrared photometry was obtained at the Cerr…
View article: The Araucaria project: High-precision orbital parallaxes and masses of binary stars
The Araucaria project: High-precision orbital parallaxes and masses of binary stars Open
Aims. We aim to measure very precise and accurate model-independent masses and distances of detached binary stars. Precise masses at the < 1% level are necessary to test and calibrate stellar interior and evolution models, while precise an…
View article: HARPS-N high spectral resolution observations of Cepheids
HARPS-N high spectral resolution observations of Cepheids Open
Context. The Baade-Wesselink (BW) method of distance determination of Cepheids is used to calibrate the distance scale. Various versions of this method are mainly based on interferometry and/or the surface-brightness color relation (SBCR).…
View article: Fundamental effective temperature measurements for eclipsing binary stars – II. The detached F-type eclipsing binary CPD-54 810
Fundamental effective temperature measurements for eclipsing binary stars – II. The detached F-type eclipsing binary CPD-54 810 Open
CPD-54 810 is a double-lined detached eclipsing binary containing two mid-F type dwarfs on an eccentric 26-d orbit. We perform a combined analysis of the extensive photometry obtained by the TESS space mission along with previously publish…
View article: Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218 Open
Aims. Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, t…
View article: Surface brightness-colour relations of dwarf stars from detached eclipsing binaries
Surface brightness-colour relations of dwarf stars from detached eclipsing binaries Open
Aims. Surface brightness – colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophotometric distances by the eclipsing binary method or th…
View article: Metallicities and ages for star clusters and their surrounding fields in the Large Magellanic Cloud
Metallicities and ages for star clusters and their surrounding fields in the Large Magellanic Cloud Open
Aims. We study 147 star clusters in the Large Magellanic Cloud (LMC) in order to determine their mean metallicities and ages, as well as the mean metallicities of 80 surrounding fields. We construct an age–metallicity relation (AMR) for th…
View article: An Absolute Calibration of the Near-infrared Period–Luminosity Relations of Type II Cepheids in the Milky Way and in the Large Magellanic Cloud
An Absolute Calibration of the Near-infrared Period–Luminosity Relations of Type II Cepheids in the Milky Way and in the Large Magellanic Cloud Open
We present time-series photometry of 21 nearby type II Cepheids in the near-infrared J , H , and K s passbands. We use this photometry, together with the Third Gaia Early Data Release parallaxes, to determine for the first time period–lumi…
View article: Orbital and physical parameters of eclipsing binaries from the ASAS catalogue – VIII. The totally eclipsing double-giant system HD 187669★
Orbital and physical parameters of eclipsing binaries from the ASAS catalogue – VIII. The totally eclipsing double-giant system HD 187669★ Open
We present the first full orbital and physical analysis of HD 187669, recognized by the All-Sky Automated Survey (ASAS) as the eclipsing binary ASAS J195222-3233.7. We combined multi-band photometry from the ASAS and SuperWASP public archi…
View article: The Araucaria Project. Distances to Nine Galaxies Based on a Statistical Analysis of their Carbon Stars (JAGB Method)
The Araucaria Project. Distances to Nine Galaxies Based on a Statistical Analysis of their Carbon Stars (JAGB Method) Open
Our work presents an independent calibration of the J -region Asymptotic Giant Branch (JAGB) method using Infrared Survey Facility photometric data and a custom luminosity function profile to determine JAGB mean magnitudes for nine galaxie…
View article: The Araucaria Project. Distances to Nine Galaxies Based on a Statistical\n Analysis of their Carbon Stars (JAGB Method)
The Araucaria Project. Distances to Nine Galaxies Based on a Statistical\n Analysis of their Carbon Stars (JAGB Method) Open
Our work presents an independent calibration of the J-region Asymptotic Giant\nBranch (JAGB) method using Infrared Survey Facility (IRSF) photometric data and\na custom luminosity function profile to determine JAGB mean magnitudes for nine…
View article: The Araucaria Project: Deep Near-infrared Photometric Maps of Local and Sculptor Group Galaxies. I. Carina, Fornax, and Sculptor
The Araucaria Project: Deep Near-infrared Photometric Maps of Local and Sculptor Group Galaxies. I. Carina, Fornax, and Sculptor Open
Deep near-infrared (NIR) J - and K -band photometry of three Local Group dwarf spheroidal galaxies—Fornax, Carina, and Sculptor—is made available for the community. Until now, these data have only been used by the Araucaria Project to dete…
View article: The surface brightness–colour relations based on eclipsing binary stars and calibrated with<i>Gaia</i>EDR3
The surface brightness–colour relations based on eclipsing binary stars and calibrated with<i>Gaia</i>EDR3 Open
Aims. The surface brightness–colour relation (SBCR) is a basic tool for establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurately determined radii and trigonometric parallaxes allow…