The angular size of dwarf stars and subgiants - Surface brightness relations calibrated by interferometry

Abstract

The availability of a number of new interferometric measurements of Main Sequence and subgiant stars makes it possible to calibrate the surface brightness relations of these stars using exclusively direct angular diameter measurements. These empirical laws allow to predict the limb darkened angular diameters theta_LD of dwarfs and subgiants using their dereddened Johnson magnitudes, or their effective temperature. The smallest intrinsic dispersions of sigma < 1% on theta_LD are obtained for the relations based on the K and L magnitudes, for instance log theta_LD = 0.0502 (B-L) + 0.5133 - 0.2 L or log theta_LD = 0.0755 (V-K) + 0.5170 - 0.2 K. Our calibrations are valid between the spectral types A0 and M2 for dwarf stars (with a possible extension to later types when using the effective temperature), and between A0 and K0 for subgiants. Such relations are particularly useful to estimate the angular size of calibrators for long baseline interferometry from readily available broadband photometry.

14 pages, 7 figures, accepted for publication in Astronomy & Astrophysics

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• OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in $\lesssim 5$ years from High-resolution Follow-up Observations
• Physical properties of the eclipsing binary KIC 9851944 and analysis of its tidally-perturbed p- and g-mode pulsations
• Surface brightness-colour relations of dwarf stars from detached eclipsing binaries -- I. Calibrating sample
• Precise mass and radius measurements for the components of the bright solar-type eclipsing binary star V1094 Tau
• Orbital and physical parameters, and the distance of the eclipsing binary system OGLE-LMC-ECL-25658 in the Large Magellanic Cloud
• A Multi-Parameter Degeneracy in Microlensing Events with Extreme Finite Source Effects
• Optical characterization and Radial velocity monitoring with Belgian and Indian Telescopes (ORBIT): the eclipsing binaries EPIC 211982753 and EPIC 211915147
• OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected Through the Channel of a Gravitational Binary-Lens Event
• Physical parameters and $\pm$0.2% parallax of the detached eclipsing binary V923 Scorpii
• Calibrating the surface brightness - color relation for late-type red giants stars in the visible domain using VEGA/CHARA interferometric observations
• OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star
• KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey
• KMT-2021-BLG-1122L: The first microlensing triple stellar system
• OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations
• WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project
• The Angular Diameter and Effective Temperature of the Lithium-Rich K Giant HD 148293 from the CHARA Array
• Determining the Physical Lens Parameters of the Binary Gravitational Microlensing Event MOA-2009-BLG-016
• Characterisation of magnetic activity of M dwarfs. Possible impact on the surface brightness
• Faint source star planetary microlensing: the discovery of the cold gas giant planet OGLE-2014-BLG-0676Lb
• The Angular Diameter of $\lambda$ Boötis}
• Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035
• A catalog of near-IR sources found unresolved with milliarcsecond resolution
• KMT-2016-BLG-2052L: Microlensing Binary Composed of M Dwarfs Revealed from a Very Long Time-scale Event
• OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and a Binary-source + Binary-lens model
• Confirmation of Color Dependent Centroid Shift Measured After 1.8 years with HST
• OGLE-2009-BLG-023/MOA-2009-BLG-028: Characterization of a Binary Microlensing Event Based on Survey Data
• OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star
• Stellar rotation effects in polarimetric microlensing
• Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey
• Kilometer-precise (UII) Umbriel physical properties from the multichord stellar occultation on 2020 September 21
• MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys
• Mass Production of 2021 KMTNet Microlensing Planets II
• OGLE-2016-BLG-1093Lb: A Sub-Jupiter-mass Spitzer Planet Located in Galactic Bulge
• TESS discovery of a super-Earth and two sub-Neptunes orbiting the bright, nearby, Sun-like star HD 22946
• The Infrared Surface Brightness technique applied to RR Lyrae stars from the solar neighborhood
• OGLE-2018-BLG-0022: First Prediction of an Astrometric Microlensing Signal from a Photometric Microlensing Event
• OGLE-2016-BLG-0156: Microlensing Event With Pronounced Microlens-Parallax Effects Yielding Precise Lens Mass Measurement
• Two newly identified eclipsing binaries in open cluster NGC 3532
• Using Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058
• Comprehensive study of five candidate delta Scuti-type pulsators in detached eclipsing binaries
• A search for dormant binaries with degenerate components in omega Centauri and NGC 6397
• Predicting Stellar Angular Sizes
• High-resolution spectroscopy of detached eclipsing binaries during total eclipses
• Spectral types of planetary host star candidates from OGLE III
• Surface brightness-color relations for red giant branch stars using asteroseismic radii and Gaia distances (the ARD method)
• KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations
• A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations
• OGLE-2019-BLG-0468Lb,c: two microlensing giant planets around a G-type star
• Kilometre-scale Jovian moon characterized for a potential JUICE flyby
• Three faint-source microlensing planets detected via resonant-caustic channel
• A Precise Estimate of the Radius of HD 149026b
• Follow-up of three exocomet-host candidates
• KMT-2018-BLG-1988Lb: microlensing super-Earth orbiting a low-mass disk dwarf