Accurate fundamental parameters for lower main‐sequence stars

  title={Accurate fundamental parameters for lower main‐sequence stars},
  author={Luca Casagrande and Laura Portinari and Chris Flynn},
  journal={Monthly Notices of the Royal Astronomical Society},
We derive an empirical effective temperature and bolometric luminosity calibration for G and K dwarfs, by applying our own implementation of the Infrared Flux Method to multiband photometry. Our study is based on 104 stars for which we have excellent BV(RI)CJHKS photometry, excellent parallaxes and good metallicities. Colours computed from the most recent synthetic libraries (ATLAS9 and MARCS) are found to be in good agreement with the empirical colours in the optical bands, but some… Expand
M dwarfs: effective temperatures, radii and metallicities
We empirically determine effective temperatures and bolometric luminosities for a large sample of nearby M dwarfs, for which high accuracy optical and infrared photometry is available. We introduce aExpand
Metallicity of M dwarfs II. A comparative study of photometric metallicity scales
Stellar parameters are not easily derived from M dwarf spectra, which are dominated by complex bands of diatomic and triatomic molecules and not well described at the line by line level byExpand
Towards stellar effective temperatures and diameters at 1 per cent accuracy for future surveys
The apparent size of stars is a crucial benchmark for fundamental stellar properties such as effective temperatures, radii and surface gravities. While interferometric measurements of stellar angularExpand
Infrared flux method and colour calibrations
The Infrared Flux Method (IRFM) is one of the most accurate techniques to derive fundamental stellar parameters – namely effective temperatures, bolometric luminosities and angular diameters – in anExpand
Calibration of Strömgren uvby-H$\beta$ photometry for late-type stars – a model atmosphere approach
Context. The use of model atmospheres for deriving stellar fundamental parameters, such as Teff ,l ogg ,a nd [Fe/H], will increase as we find and explore extreme stellar populations where empiricalExpand
Synthetic stellar photometry – I. General considerations and new transformations for broad-band systems
After a pedagogical introduction to the main concepts of synthetic photometry, colours and bolometric corrections in the Johnson-Cousins, 2MASS, and HST-ACS/WFC3 photometric systems are generatedExpand
Absolute physical calibration in the infrared
We determine an absolute calibration for the Multiband Imaging Photometer for Spitzer 24 μm band and recommend adjustments to the published calibrations for Two Micron All Sky Survey (2MASS),Expand
New constraints on the chemical evolution of the solar neighbourhood and galactic disc(s) - improved astrophysical parameters for the Geneva-Copenhagen Survey
We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter toExpand
Deriving precise parameters for cool solar-type stars Optimizing the iron line list ?;??;???
Context. Temperature, surface gravity, and metallicitity are basic stellar atmospheric parameters necessary to characterize a star. There are several methods to derive these parameters and aExpand
The helium abundance and ΔY/ΔZ in lower main-sequence stars
We use nearby K dwarf stars to measure the helium-to-metal enrichment ratio ΔY/ΔZ, a diagnostic of the chemical history of the solar neighbourhood. Our sample of K dwarfs has homogeneously determinedExpand


Effective temperature scale and bolometric corrections from 2MASS photometry
We present a method to determine effective temperatures, angular semi-diameters and bolometric corrections for population I and II FGK type stars based on V and 2MASS IR photometry. AccurateExpand
Determination of effective temperatures for an extended sample of dwarfs and subdwarfs (F0-K5)
We have applied the InfraRed Flux Method (IRFM) to a sample of 475 dwarfs and subdwarfs in order to derive their eective temperatures with a mean accuracy of about 1.5%. We have used the newExpand
The effective temperature scale of FGK stars. I. Determination of temperatures and angular diameters with the infrared flux method
The infrared flux method (IRFM) has been applied to a sample of 135 dwarf and 36 giant stars covering the following regions of the atmospheric parameter space: (1) the metal-rich ([Fe/H] 0) endExpand
The Effective Temperature Scale of FGK Stars. II. Teff:Color:[Fe/H] Calibrations
We present up-to-date metallicity-dependent temperature versus color calibrations for main-sequence and giant stars based on temperatures derived with the infrared flux method (IRFM). SeventeenExpand
Comparison of White Dwarf Models with STIS Spectrophotometry
Computed flux distributions for four white dwarf (WD) stars with nearly pure hydrogen atmospheres are tied to the Vega flux scale with V-band Landolt photometry. With broadband photometric precisionExpand
Model atmospheres for G, F, A, B, and O stars
A grid of LTE model atmospheres is presented for effective temperatures ranging from 5500 to 50,000 K, for gravities from the main sequence down to the radiation pressure limit, for abundances solar,Expand
The use of spectral line-depth ratios as a stellar thermometer in G and K dwarfs is developed and refined beyond an earlier study (Gray and Johnson 1991). Ratios incorporating a line with any degreeExpand
Determination of the temperatures of selected ISO flux calibration stars using the Infrared Flux Method
Eective temperatures for 420 stars with spec- tral types between A0 and K3, and luminosity classes between II and V, selected for a flux calibration of the Infrared Space Observatory, ISO, have beenExpand
Homogeneous photometry and metal abundances for a large sample of Hipparcos metal-poor stars★
Homogeneous photometric data (Johnson V, B-V, V-K, Cousins V-I and Stromgren b-y), radial velocities, and abundances of Fe, O, Mg, Si, Ca, Ti, Cr and Ni are presented for 99 stars with high-precisionExpand
Abundances for metal-poor stars with accurate parallaxes , I. Basic data
We present element-to-element abundance ratios measured from high dispersion spectra for 150 field subdwarfs and early subgiants with accurate Hipparcos parallaxes (errors <20%). For 50 stars newExpand