Surface brightness-colour relations of dwarf stars from detached eclipsing binaries

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 Baade–Wesselink method. Double-lined detached eclipsing binary stars (SB2 DEBs), with precisely known trigonometric parallaxes, allow us to calibrate SBCRs with a high level of precision. To improve such calibrations, it is important to supplement the sample of suitable eclipsing binaries with precisely determined physical parameters. Methods . We selected ten SB2 DEBs within 0.8 kpc of the Sun, which feature components of spectral types ranging from B9 to K3. We analysed their TESS and Kepler K2 space-based photometry simultaneously with the radial velocities derived from HARPS spectra using the Wilson–Devinney code. The disentangled spectra of DEBs were used to derive atmospheric parameters of their components by applying the GSSP code. The direct effective temperatures were also calculated using spectral energy distribution analysis. The O–C diagrams of the minima times were investigated to detect long-term period changes or apsidal motions. Results . Most of the systems are composed of significantly unequal components, with mass ratios as low as ~0.5. We derived precise masses, radii, and surface temperatures for them, along with their metallicities. The average precision of mass and radii determinations is 0.3% and 1.4%, respectively, for the surface temperature. The spectroscopic and photometric temperatures of the components are usually consistent to within 100 K, but in some systems, the difference is much larger. The components of HD 149946 show the highest difference (up to 400 K), while the atmospheric models favour different surface metallicities. We also provide an updated calibration of the equivalent width of the interstellar sodium D1 line and the reddening E( B – V ).

Authors

Institutions

Publication Details

Journal
Astronomy and Astrophysics
Published
2025-02-01
DOI
https://doi.org/10.1051/0004-6361/202452065
Citations
1
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
1.15

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Surface brightness-colour relations of dwarf stars from detached eclipsing binaries

P. Kervella, N. Nardetto, P. F. L. Maxted, R. Smolec et al.
1 citations
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
1.15
article

Surface brightness-colour relations of dwarf stars from detached eclipsing binaries

P. Kervella, N. Nardetto, P. F. L. Maxted, R. Smolec, Marek Górski, G. Rojas García, P. Karczmarek, Piotr Wielgórski, Mónica Taormina, B. Pilecki, D. Graczyk, A. Gallenne, N J Miller, C. Gałan, K. Suchomska, G. Hajdu, W. Gieren, R. Chini, W. Narloch, W. Pych, Bartłomiej Zgirski, Mikołaj Kałuszyński, G. Pietrzyński, Mirosław Kicia
article en
1 citations

Abstract

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 Baade–Wesselink method. Double-lined detached eclipsing binary stars (SB2 DEBs), with precisely known trigonometric parallaxes, allow us to calibrate SBCRs with a high level of precision. To improve such calibrations, it is important to supplement the sample of suitable eclipsing binaries with precisely determined physical parameters. Methods . We selected ten SB2 DEBs within 0.8 kpc of the Sun, which feature components of spectral types ranging from B9 to K3. We analysed their TESS and Kepler K2 space-based photometry simultaneously with the radial velocities derived from HARPS spectra using the Wilson–Devinney code. The disentangled spectra of DEBs were used to derive atmospheric parameters of their components by applying the GSSP code. The direct effective temperatures were also calculated using spectral energy distribution analysis. The O–C diagrams of the minima times were investigated to detect long-term period changes or apsidal motions. Results . Most of the systems are composed of significantly unequal components, with mass ratios as low as ~0.5. We derived precise masses, radii, and surface temperatures for them, along with their metallicities. The average precision of mass and radii determinations is 0.3% and 1.4%, respectively, for the surface temperature. The spectroscopic and photometric temperatures of the components are usually consistent to within 100 K, but in some systems, the difference is much larger. The components of HD 149946 show the highest difference (up to 400 K), while the atmospheric models favour different surface metallicities. We also provide an updated calibration of the equivalent width of the interstellar sodium D1 line and the reddening E( B – V ).

Astronomy and AstrophysicsVol. 694
Centre National de la Recherche Scientifique (FR), Universidad Andrés Bello (CL), University of Concepción (CL), Université Côte d'Azur (FR), Université Paris Cité (FR), Université Paris Sciences et Lettres (FR), Observatoire de Paris (FR), Universidad Católica del Norte (CL), Sorbonne Université (FR), Chinese Academy of Science South America Center for Astronomy (CL), Laboratoire d’études spatiales et d’instrumentation en astrophysique (FR), Observatoire de la Côte d’Azur (FR), Nicolaus Copernicus Astronomical Center (PL), Keele University (GB), Ruhr University Bochum (DE), Polish Academy of Sciences (PL)
National Aeronautics and Space Administration, Space Telescope Science Institute, European Space Agency, European Commission, Agence Nationale de la Recherche, Fundacja na rzecz Nauki Polskiej, Agencia Nacional de Investigación y Desarrollo
Openalex Percentile: Top 21%
Stellar, planetary, and galactic studies
1.15
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.