Oscillation mode linewidths and heights of 23 main-sequence stars observed by Kepler

Abstract

Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe the stars using asteroseismology. We provide the mode linewidths and mode heights of the oscillations of various stars as a function of frequency and of effective temperature. We used a time series of nearly two years of data for each star. The 23 stars observed belong to the simple or F-like category. The power spectra of the 23 main-sequence stars were analysed using both maximum likelihood estimators and Bayesian estimators, providing individual mode characteristics such as frequencies, linewidths, and mode heights. We study the source of systematic errors in the mode linewidths and mode heights, and we present a way to correct these errors with respect to a common reference fit. Using the correction, we could explain all sources of systematic errors, which could be reduced to less than $\pm$15% for mode linewidths and heights, and less than $\pm$5% for amplitude, when compared to the reference fit. The effect of a different estimated stellar background and a different estimated splitting will provide frequency-dependent systematic errors that might affect the comparison with theoretical mode linewidth and mode height, therefore affecting the understanding of the physical nature of these parameters. All other sources of relative systematic errors are less dependent upon frequency. We also provide the dependence of the so-called linewidth dip, in the middle of the observed frequency range, as a function of effective temperature. We show that the depth of the dip decreases with increasing effective temperature. The dependence of the dip on effective temperature may imply that the mixing length parameter $\alpha$ or the convective flux may increase with effective temperature.

Accepted by A&A, 38 pages, 35 figures, 26 tables

References in corpus (3)

• Rotation speed and stellar axis inclination from p modes: How CoRoT would see other suns
• Visibilities and bolometric corrections for stellar oscillation modes observed by Kepler
• Damping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations

Cited by in corpus (27)

• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• Asteroseismology of solar-type stars
• DIAMONDS: a new Bayesian Nested Sampling tool. Application to Peak Bagging of solar-like oscillations
• NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
• Bayesian peak bagging analysis of 19 low-mass low-luminosity red giants observed with Kepler
• Theoretical power spectra of mixed modes in low mass red giant stars
• Asteroseismology of 36 \emph{Kepler} subgiants -- I. Oscillation frequencies, linewidths and amplitudes
• PBjam: A Python package for automating asteroseismology of solar-like oscillators
• Fundamental properties of Kepler and CoRoT targets: III. Tuning scaling relations using the first adiabatic exponent
• Tess asteroseismology of the known planet host star ${\lambda }^2$ Fornacis
• The PLATO Solar-like Light-curve Simulator: A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission
• Latitudinal differential rotation in the solar analogues 16 Cyg A and B
• Seismic performance
• Fast and Automated Peak Bagging with DIAMONDS (FAMED)
• Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helio- and asteroseismology
• Convective Excitation and Damping of Solar-like Oscillations
• Asteroseismology of KIC 7107778: a binary comprising almost identical subgiants
• Bayesian hierarchical inference of asteroseismic inclination angles
• Damping rates and frequency corrections of Kepler LEGACY stars
• Seismic constraints on the internal structure of evolved stars: From high-luminosity RGB to AGB stars
• Measuring frequency and period separations in red-giant stars using machine learning
• Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution
• A probabilistic method for detecting solar-like oscillations using meaningful prior information
• Two's a crowd? Characterising the effect of photometric contamination on the extraction of the global asteroseismic parameter ${\nu }_{\text{max}}$ in red-giant binaries
• Detecting active latitudes of Sun-like stars using asteroseismic a-coefficients
• Pushing the boundaries of asteroseismic individual frequency modelling: unveiling two evolved very-low metallicity red giants
• Les Trente Glorieuses: 29 years of helioseismic observations with the Luminosity Oscillations Imager