An absolutely calibrated effective temperature scale from the InfraRed Flux Method

Abstract

Various effective temperature scales have been proposed over the years. Despite much work and the high internal precision usually achieved, systematic differences of order 100 K (or more) among various scales are still present. We present an investigation based on the Infrared Flux Method aimed at assessing the source of such discrepancies and pin down their origin. We break the impasse among different scales by using a large set of solar twins, stars which are spectroscopically and photometrically identical to the Sun, to set the absolute zero point of the effective temperature scale to within few degrees. Our newly calibrated, accurate and precise temperature scale applies to dwarfs and subgiants, from super-solar metallicities to the most metal-poor stars currently known. At solar metallicities our results validate spectroscopic effective temperature scales, whereas for [Fe/H]<-2.5 our temperatures are roughly 100 K hotter than those determined from model fits to the Balmer lines and 200 K hotter than those obtained from the excitation equilibrium of Fe lines. Empirical bolometric corrections and useful relations linking photometric indices to effective temperatures and angular diameters have been derived. Our results take full advantage of the high accuracy reached in absolute calibration in recent years and are further validated by interferometric angular diameters and space based spectrophotometry over a wide range of effective temperatures and metallicities.

Accepted for publication in Astronomy and Astrophysics. Landscape table available online at http://www.mpa-garching.mpg.de/~luca/IRFM/

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• Convective boundary mixing in low- and intermediate-mass stars I. Core properties from pressure-mode asteroseismology
• The RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks
• Study of HD 169392A observed by CoRoT and HARPS
• 2MASS J18082002-5104378: The brightest (V=11.9) ultra metal-poor star
• Testing stellar evolution models with the retired A star HD 185351
• Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions
• High-resolution abundance analysis of HD 140283
• K2-231 b: A sub-Neptune exoplanet transiting a solar twin in Ruprecht 147
• The Old, Super-Metal-Rich Open Cluster, NGC 6791 - Elemental Abundances in Turn-off Stars from Keck/HIRES Spectra
• Eclipsing binaries in the open cluster Ruprecht 147. I: EPIC 219394517
• The chemical abundance pattern of the extremely metal-poor thin disk star 2MASS J1808-5104 and its origins
• Searching for chemical signatures of brown dwarf formation
• Solar and Stellar Photospheric Abundances
• Milky Way tomography with the SkyMapper Southern Survey: I: Atmospheric parameters and distances of one million red giants
• Know thy star, know thy planet: Chemo-kinematically characterizing TESS targets
• Lithium depletion and angular momentum transport in F-type and G-type stars in Galactic open clusters
• Solar analogues and Solar twins in the HARPS archive
• The Araucaria Project. Accurate stellar parameters and distance to evolved eclipsing binary ASAS J180057-2333.8 in Sagittarius Arm
• Solar twins in M67 : Evolutionary status and lithium abundance
• Fiducial Stellar Population Sequences for the VJKs Photometric System
• Through thick and thin: Structure of the Galactic thick disc from extragalactic surveys
• The metal rich abundance pattern - spectroscopic properties and abundances for 107 main-sequence stars
• Serendipitous discovery of the faint solar twin Inti 1
• Consistent Iron Abundances Derived from Neutral and Singly-Ionized Iron Lines in Ultraviolet and Optical Spectra of Six Warm Metal-Poor Stars
• Local associations and the barium puzzle
• Ariel stellar characterisation: I -- homogeneous stellar parameters of 187 FGK planet host stars Description and validation of the method
• Mass effect on the lithium abundance evolution of open clusters: Hyades, NGC 752, and M67
• A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)
• Identification of a Group III CEMP-no Star in the Dwarf Spheroidal Galaxy Canes Venatici I
• The Surface Brightness--Color Relations Based on Eclipsing Binary Stars: Toward Precision Better than 1% in Angular Diameter Predictions
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
• High Dispersion Spectroscopy of the Superflare Star KIC6934317
• The surface brightness - colour relations based on eclipsing binary stars and calibrated with Gaia EDR3
• The Araucaria project: High-precision orbital parallaxes and masses of binary stars. I. VLTI/GRAVITY observations of ten double-lined spectroscopic binaries
• Star Formation Timescales of the Halo Populations from Asteroseismology and Chemical Abundances
• Hierarchically modelling Kepler dwarfs and subgiants to improve inference of stellar properties with asteroseismology
• The cluster ages experiment (CASE). VII. Analysis of two eclipsing binaries in the globular cluster NGC 6362
• Binary open clusters in the Milky Way: photometric and spectroscopic analysis of NGC 5617 and Trumpler 22
• Absolute dimensions of solar-type eclipsing binaries. EF Aquarii: a G0 test for stellar evolution models
• Constraints on the Distance Moduli, Helium and Metal Abundances, and Ages of Globular Clusters From Their RR Lyrae and Non-Variable Horizontal-Branch Stars. III. M55 and NGC 6362
• Titans metal-poor reference stars. I. Accurate effective temperatures and surface gravities for dwarfs and subgiants from 3D non-LTE H$\alpha$ profiles and Gaia parallaxes
• Attempts to reproduce the rotation profile of the red giant KIC 7341231 observed by Kepler
• Atmospheric Parameters and Metallicities for 2191 stars in the Globular Cluster M4
• A three-dimensional hydrodynamical line profile analysis of iron lines and barium isotopes in HD140283
• SOPHIE velocimetry of Kepler transit candidates II. KOI-428b: a hot Jupiter transiting a subgiant F-star
• The R-Process Alliance: Discovery of a low-alpha, r-Process-Enhanced Metal-Poor Star in the Galactic Halo
• The Most Metal-poor Stars in the Inner Bulge
• Fundamental parameters of 8 Am stars: comparing observations with theory
• The GAPS Programme at TNG XLII. A characterisation study of the multi-planet system around the 400 Myr-old star HD 63433 (TOI-1726)
• High Resolution Optical Spectroscopy of Stars in the Sylgr Stellar Stream
• UBV(RI)_C photometry of transiting planet host stars
• An Improved Determination of the Lithium Depletion Boundary Age of Blanco 1 and a First Look on the Effects of Magnetic Activity
• Chronology of the chemical enrichment of the old Galactic stellar populations
• Asteroseismology of the Hyades with K2: first detection of main-sequence solar-like oscillations in an open cluster
• Searching for new solar twins: The Inti survey for the Northern Sky
• The Pan-Pacific Planet Search V. Fundamental Parameters for 164 Evolved Stars
• Mining S-PLUS for Metal-Poor Stars in the Milky Way
• Evidences of extragalactic origin and planet engulfment in the metal-poor twin pair HD 134439/HD 134440
• Influence of Collisions with Hydrogen on Titanium Abundance Determinations in Cool Stars
• Optimal Integrated Abundances for Chemical Tagging of Extragalactic Globular Clusters
• Testing the Limits of Precise Subgiant Characterization with APOGEE and Gaia: Opening a Window to Unprecedented Astrophysical Studies
• A solar twin in the eclipsing binary LL Aqr
• Chemical abundances of metal-poor RR Lyrae stars in the Magellanic Clouds
• NIR spectroscopy of the Sun and HD20010 - Compiling a new linelist in the NIR
• Solar twins in the ELODIE archive
• EPIC229426032 b and EPIC246067459 b: discovery and characterization of two new transiting hot Jupiters from K2
• Abundances of alpha-Process Elements in Thin-Disk, Thick-Disk, and Halo Stars of the Galaxy: Non-LTE Analysis
• The extreme CNO-enhanced composition of the primitive iron-poor dwarf star J0815+4729
• The Distances to Open Clusters from Main-Sequence Fitting. V. Extension of Color Calibration and Test using Cool and Metal-Rich Stars in NGC 6791
• Spectroscopic Survey of G and K Dwarfs in the Hipparcos Catalog. I. Comparison between the Hipparcos and Photometric Parallaxes
• M giants with IGRINS I. Stellar parameters and $\alpha$-abundance trends of the solar neighborhood population
• Testing Asteroseismic Radii of Dwarfs and Subgiants with Kepler and Gaia
• Asteroseismology of KIC 7107778: a binary comprising almost identical subgiants
• Star Cluster Ages in the Gaia Era
• Accurate effective temperature from H$\alpha$ profiles
• A Critique of the Spite Plateau, and the Astration of Primordial Lithium
• Line-of-sight velocity and metallicity measurements of the Palomar 5 tidal stream
• The K2 M67 Study: Precise Mass for a Turnoff Star in the Old Open Cluster M67
• Li abundances for solar twins in the open cluster M67
• The peculiar chemical pattern of the WASP-160 binary system: signatures of planetary formation and evolution?
• Titans metal-poor reference stars II. Red giants and CEMP stars
• Evidence for multiple nucleosynthetic processes from carbon enhanced metal-poor stars in the Carina dwarf spheroidal galaxy
• Eclipsing binaries in the open cluster Ruprecht 147. III: The triple system EPIC 219552514 at the main-sequence turnoff
• Influence of Inelastic Collisions with Hydrogen Atoms on Non-LTE Oxygen Abundance Determination in the Sun and late-type stars
• Analysis of Detached Eclipsing Binaries near the Turnoff of the Open Cluster NGC 7142
• Chrono-chemodynamical analysis of the globular cluster NGC 6355: Looking for the fundamental bricks of the Bulge
• Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• Revisiting Delta Y/Delta Z from multiple main sequences in Globular Clusters: insight from nearby stars
• Calibrating the α parameter of convective efficiency using observed stellar properties
• Bayesian isochrone fitting and stellar ages
• The $\text{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\text{Gaia}$ DR2 ultra-cool dwarf
• NGC 6752 AGB Stars Revisited: I. Improved AGB temperatures remove apparent overionisation of Fe I
• Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. II. Application to the Colour-Magnitude Diagrams of the Globular Clusters 47 Tuc, NGC 6362, M5, M3, M55, and M92
• First assessment of the binary lens OGLE-2015_BLG-0232
• A New CEMP-s RR Lyrae Star
• 12C/13C ratio and CNO abundances in the classical very old metal-poor dwarf HD 140283
• On the AGB stars of M 4: A robust disagreement between spectroscopic observations and theory
• Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446
• Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries
• A Detailed Study of Giants and Horizontal Branch Stars in M68: Atmospheric Parameters and Chemical Abundances
• Models of Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. I. Bolometric Corrections Derived from New MARCS Synthetic Spectra and Their Implications for Observed Colour-Magnitude Diagrams
• The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators. I: Data and Asteroseismic parameters
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Characterizing Kepler Asteroseismic Targets
• Discovery of new members of the nearby young stellar association in Cepheus
• Target Selection for the SDSS-III MARVELS Survey
• A Comparison of the Chemical Composition of Main Sequence and Giant Stars in the Open Cluster NCC 752
• A distinct halo population revealed from 3D non-LTE magnesium abundances
• Discovery of Nine Super Li-rich Unevolved Stars from the LAMOST Survey
• The M4 Core Project with HST - IV. Internal Kinematics from Accurate Radial Velocities of 2771 Cluster Members
• Inhomogeneity in the early Galactic chemical enrichment exposed by beryllium abundances in extremely metal-poor stars
• Homogeneous Stellar Atmospheric Parameters and 22 Elemental Abundances for FGK Stars Derived From LAMOST Low-resolution Spectra with DD-Payne
• Bayesian Cross-Matching of High Proper Motion Stars in Gaia DR2 and Photometric Metallicities for $\sim$1.7 million K and M Dwarfs
• Survey for Distant Solar Twins (SDST) -- I. EPIC method for stellar parameter measurement
• Three Ultra-short Period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys
• A Differential Abundance Analysis of Very Metal-Poor Stars
• Eclipsing binaries in the open cluster Ruprecht 147. II: EPIC 219568666
• Chemo-dynamics and asteroseismic ages of seven metal-poor red giants from the Kepler field
• Direct Spectral Detection: An Efficient Method to Detect and Characterize Binary Systems
• Bright low mass eclipsing binary candidates observed by STEREO
• Modeling the near-UV band of GK stars, Paper II: NLTE models
• TMCalc - A fast code to derive Teff and [Fe/H] for FGK stars
• The Aquarius Co-Moving Group is Not a Disrupted Classical Globular Cluster
• The Araucaria Project. Precise physical parameters of the eclipsing binary IO Aqr
• Wilson-Bappu Effect: Extended to Surface Gravity
• Multiplexing Precision RVs: Searching for Close in Gas Giants in Open Clusters
• Planetary companions around the metal-poor star HIP 11952
• New Teff and [Fe/H] spectroscopic calibration for FGK dwarfs and GK giants
• The K2 M67 Study: A Curiously Young Star in an Eclipsing Binary in an Old Open Cluster
• A formation timescale of the Galactic halo from Mg isotopes in dwarf stars
• Characterization of Exoplanet-Host Stars
• Carbon-enhanced metal-poor stars in the SDSS-APOGEE database
• Impact of measurement errors on the inferred stellar asteroseismic ages. Statistical models for intermediate age main sequence and red giant branch stars
• Confirming the presence of second population stars and the iron discrepancy along the AGB of the globular cluster NGC 6752
• Absolute properties of BG Ind - a bright F3 system just leaving the Main Sequence
• Spectroscopic Determination of Stellar Parameters and Oxygen Abundances for Hyades/Field G-K Dwarfs
• The Peculiar Globular Cluster Palomar 1 and Persistence in the SDSS-APOGEE Database
• Heavy elements in old very metal-rich stars
• Investigating three Sirius-like systems with SPHERE
• Absolute Properties of the Eclipsing Binary Star V501 Herculis
• Fine Structure of the Age-Chromospheric Activity Relation in Solar-Type Stars: II. H$\alpha$ Line
• Investigation of a transiting planet candidate in Trumpler 37: an astrophysical false positive eclipsing spectroscopic binary star
• Surface brightness-colour relations of dwarf stars from detached eclipsing binaries -- I. Calibrating sample
• Chemodynamical Properties and Ages of Metal-Poor Stars in S-PLUS
• Orbital and physical parameters, and the distance of the eclipsing binary system OGLE-LMC-ECL-25658 in the Large Magellanic Cloud
• AGB subpopulations in the nearby globular cluster NGC 6397
• The GALAH Survey: Velocity fluctuations in the Milky Way using red clump giants
• A time-series VI study of the variable stars of the globular cluster NGC 6397
• Accurate stellar parameters and distance to two evolved eclipsing binary systems, OGLE-BLG-ECL-123903 and OGLE-BLG-ECL-296596, towards the Galactic bulge
• RR Lyrae stars as probes of the outer Galactic halo: Chemical and kinematic analysis of a pilot sample
• Absolute Properties of the Triple Star CF Tauri
• Something borrowed, something blue: The nature of blue metal-poor stars inferred from their colours and chemical abundances
• Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey: II. the bolometric and photospheric calibration
• Estimating the age-metallicity distribution of a stellar sample from the probability distributions of the individual stars
• Eclipsing binaries in the open cluster Ruprecht 147. IV: The active triple system EPIC 219511354
• Faint solar analogs: at the limit of no reddening
• Confirming known planetary trends using a photometrically selected Kepler sample
• Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. III. Grids of Isochrones for $-2.5\le$ [Fe/H] $\le -0.5$ and Helium Abundances $Y=0.25$ and $0.29$ at Each Metallicity
• LOTUS: A (non-)LTE Optimization Tool for Uniform derivation of Stellar atmospheric parameters
• The peculiar composition of the Sun is not related to giant planets
• The Young Solar Analogs Project: I. Spectroscopic and Photometric Methods and Multi-year Timescale Spectroscopic Results
• Hubble Space Telescope Astrometry of the Metal-Poor Visual Binary $\mu$ Cassiopeiae: Dynamical Masses, Helium Content, and Age
• New Lithium Measurements in Metal-Poor Stars
• The oldest stars with low neutron-capture element abundances and origins in ancient dwarf galaxies
• A VIMOS spectroscopy of photometric variables and straggler candidates in omega Centauri
• Beryllium abundances in turn-off stars of globular clusters with the CUBES spectrograph
• Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391
• Chemical abundances of the metal-poor horizontal-branch stars CS 22186-005 and CS 30344-033
• Absolute Properties of the Triple Star HP Aurigae
• Science cases for a visible interferometer
• Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
• Globular and Open Clusters Observed by SDSS/SEGUE: the Giant Stars
• The Impact of Inelastic Collisions with Hydrogen on NLTE Copper Abundances in Metal-Poor Stars
• Entropy Production and Luminosity-Effective Temperature Relation for Main-Sequence Stars
• Revisiting the iron abundance in the hyper iron-poor star HE 1327-2326 with UV COS/$HST$ data
• The Origin of the Metal-Poor Common Proper Motion Pair HD 134439/134440: Insights from New Elemental Abundances
• The Average Physical Properties of A-G Stars Derived from uvby-H$\beta$ Strömgren-Crawford Photometry as the Basis for a Spectral-Classification Synthetical Approach
• Turbulence driven by stellar jets, the possibility and the efficiency
• Inversion of stellar spectral radiative properties based on multiple star catalogues
• Constraining the Rotation Profile in a Low-Luminosity Subgiant with a Surface Rotation Measurement
• Beyond the Nyquist frequency: Asteroseismic catalog of undersampled Kepler late subgiants and early red giants
• The Sun. A typical star in the solar neighborhood?
• Eclipsing Binary Science Via the Merging of Transit and Doppler Exoplanet Survey Data - A Case Study With the MARVELS Pilot Project and SuperWASP
• Absolute dimensions of the early F-type eclipsing binary V506 Ophiuchi
• Absolute dimensions of the F-type eclipsing binary V2154 Cygni
• The metal-poorest tail of the Galactic halo: hypothesis on its origin from precise spectral analysis
• An empirical metallicity tracer in CEMP and C-normal stars
• The highest mass Kepler red giants -- II. Spectroscopic parameters, the amplitude-activity relation, and unexpected halo orbits
• Absolute dimensions of the low-mass eclipsing binary system NSVS 10653195
• Precise Masses and Orbits for Nine Radial Velocity Exoplanets
• Survey for Distant Solar Twins (SDST) -- II. Design, observations and data
• Recalibration of SDSS photometric zero-points based on the InfraRed Flux Method temperature scale
• Using Stellar Spectral Energy Distributions to Measure Exoplanet Parameters
• The odd bunch: chrono-chemo-dynamics of sixteen unusual stars from Kepler
• Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
• Determining distances using asteroseismic methods
• TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data
• Spectroscopic characterization of a sample of metal-poor solar-type stars from the HARPS planet search program. Precise spectroscopic parameters and mass estimation
• 14 Her: a likely case of planet-planet scattering
• The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
• UVES analysis of red giants in the bulge globular cluster NGC 6522
• Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6
• Mixing-length calibration from field stars. An investigation on statistical errors, systematic biases, and spurious metallicity trends
• Ba Isotope Ratio in CEMP-s and CEMP-rs Stars as a Signature of s-Process and i-Process
• The SAGA so far: reading the history of the Galaxy with asteroseismology
• Preliminary Evaluation of the Kepler Input Catalog Extinction Model Using Stellar Temperatures
• Precise physical parameters of three late-type eclipsing binary giant stars in the Large Magellanic Cloud
• 'Rapid fire' spectroscopy of Kepler solar-like oscillators