Testing Asteroseismic Radii of Dwarfs and Subgiants with Kepler and Gaia

Abstract

We test asteroseismic radii of Kepler main-sequence and subgiant stars by deriving their parallaxes which are compared with those of the first Gaia data release. We compute radii based on the asteroseismic scaling relations as well as by fitting observed oscillation frequencies to stellar models for a subset of the sample, and test the impact of using effective temperatures from either spectroscopy or the infrared flux method. An offset of 3%, showing no dependency on any stellar parameters, is found between seismic parallaxes derived from frequency modelling and those from Gaia. For parallaxes based on radii from the scaling relations, a smaller offset is found on average; however, the offset becomes temperature dependent which we interpret as problems with the scaling relations at high stellar temperatures. Using the hotter infrared flux method temperature scale, there is no indication that radii from the scaling relations are inaccurate by more than about 5%. Taking the radii and masses from the modelling of individual frequencies as reference values, we seek to correct the scaling relations for the observed temperature trend. This analysis indicates that the scaling relations systematically overestimate radii and masses at high temperatures, and that they are accurate to within 5% in radius and 13% in mass for main-sequence stars with temperatures below 6400 K. However, further analysis is required to test the validity of the corrections on a star-by-star basis and for more evolved stars.

arXiv comment12 pages, 9 figures. Accepted for publication in MNRAS

References in corpus (30)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Low Temperature Opacities
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• A Three-Dimensional Map of Milky-Way Dust
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• ADIPLS -- the Aarhus adiabatic oscillation package
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• Asteroseismic fundamental properties of solar-type stars observed by the NASA Kepler Mission
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• A Revised Effective Temperature Scale for the Kepler Input Catalog
• Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• Fundamental Properties of Stars using Asteroseismology from Kepler & CoRoT and Interferometry from the CHARA Array
• A new correction of stellar oscillation frequencies for near-surface effects
• Testing the asteroseismic scaling relations for Red Giants with Eclipsing Binaries Observed by Kepler
• Accurate fundamental parameters for Lower Main Sequence Stars
• Verifying asteroseismically determined parameters of Kepler stars using hipparcos parallaxes: self-consistent stellar properties and distances
• Oscillation frequencies for 35 \Kepler solar-type planet-hosting stars using Bayesian techniques and machine learning
• Interferometric radii of bright Kepler stars with the CHARA Array: θ Cygni and 16 Cygni A and B
• The Metallicities of Stars With and Without Transiting Planets
• Evidence for a systematic offset of $-$0.25 mas in the Gaia DR1 parallaxes
• First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {\Mu}Her
• Asteroseismic diagrams from a survey of solar-like oscillations with Kepler
• Asteroseismic modelling of the solar-type subgiant star $\beta$ Hydri
• Primordial Helium And the Cosmic Background Radiation
• Asteroseismic versus Gaia distances: a first comparison
• Using red clump stars to correct the Gaia DR1 parallaxes

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• The Aarhus Red Giants Challenge I: Stellar structures in the red giant branch phase
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• The subgiant HR 7322 as an asteroseismic benchmark star
• Systematic Differences in Spectroscopic Analysis of Red Giants
• Fundamental properties of Kepler and CoRoT targets -- IV. Masses and radii from frequencies of minimum $\Delta \nu$ and their implications
• The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators. I: Data and Asteroseismic parameters
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• Asteroseismic analysis of 15 solar-like oscillating evolved stars
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