J/ApJ/857/119ivo://CDS.VizieR/J/ApJ/857/119doi:10.26093/cds/vizier.18570119CDSBenomar O.Goupil M.Belkacem K.Appourchaux T.Nielsen M.B.Bazot M.,Gizon L.Hanasoge S.Sreenivasan K.R.Marchand B.2019-05-07T07:22:31Z2019-04-25T09:20:26ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frasteroseismologyg-starsOscillation properties are usually measured by fitting symmetric Lorentzian profiles to the power spectra of Sun-like stars. However, the line profiles of solar oscillations have been observed to be asymmetrical for the Sun. The physical origin of this line asymmetry is not fully understood; though, it should depend on the depth dependence of the source of wave excitation (convective turbulence) and details of the observable (velocity or intensity). For oscillations of the Sun, it has been shown that neglecting the asymmetry leads to systematic errors in the frequency determination. This could subsequently affect the results of seismic inferences of the solar internal structure. Using light curves from the Kepler spacecraft, we have measured mode asymmetries in 43 stars. We confirm that neglecting the asymmetry leads to systematic errors that can exceed the 1{sigma} confidence intervals for seismic observations longer than one year. Therefore, the application of an asymmetric Lorentzian profile should be favored to improve the accuracy of the internal stellar structure and stellar fundamental parameters. We also show that the asymmetry changes sign between cool Sun-like stars and hotter stars. This provides the best constraints to date on the location of the excitation sources across the Hertzsprung-Russel diagram.2018ApJ...857..119Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/857/119CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/ApJ/718/L97 : Early asteroseismic results from Kepler (Van Grootel+, 2010)J/A+A/569/A21 : Age and mass of CoRoT exoplanet host HD 52265 (Lebreton, 2014)J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)J/MNRAS/446/2959 : Asterosismology for 16 Cyg A/B (Davies+, 2015)J/AJ/152/6 : Kepler star param. using LAMOST + seismic data (Wang+, 2016)J/A+A/601/A67 : Kepler solar-type stars modeling (Creevey+, 2017)J/ApJ/835/172 : Kepler asteroseismic LEGACY sample. I. (Lund+, 2017)J/ApJ/844/102 : KIC parallaxes from asteroseismology vs Gaia (Huber+, 2017)J/ApJS/237/17 : Temporal frequency shifts in 87 Kepler stars (Santos+, 2018)http://kasoc.phys.au.dk/ : KASOC home pagehttp://amp.phys.au.dk/ : Asteroseismic Modeling Portal (AMP) home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/857/119https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/857/119http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/857/119https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/857/119https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/857/119http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/857/119GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/857/119/stars (Studied sample; table added by CDS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/857/119/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/857/119/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/857/119/stars?GETtext/xml+votable180.050000true286.438590338.52293330.0055555555555555566/14581 14751 14757 14759 14765 14767 14771 14776 14778 14779 14781 14918 14921 14930 14931 14932 14935 14937 14939 14948 14959 14960 14962 14963 14966 14969 15044 15061 15106 15109 15112 15118 15121 15123 15145 15146 15156 15172 15174 15178https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/857/119?format=asciidefaultJ/ApJ/857/119/starsStudied sample; table added by CDSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC[3427720/12258514] Kepler Input Catalog IDmeta.id;meta.mainlongprimaryNmNumber of measurements for this star (link to Table 1)meta.numberintnullableL17Display data from Lund+, 2017, J/ApJ/835/172meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/857/119/table1Measured mode frequency, width, height, asymmetry, and frequency shifte_Gamma[0.02/4] Lower uncertainty in Gammastat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC[3427720/12258514] Kepler Input Catalog IDmeta.id;meta.mainlongl[0/3] Mode degreestat.fit.paramintnu[550.9/5377.3] Measured mode frequencyuHzem.freq;src.vardoublee_nu[0.029/5.5] Lower uncertainty in nuuHzstat.errorfloatE_nu[0.028/3.8] Upper uncertainty in nuuHzstat.error;stat.maxfloatGamma[0.02/13.5] Full Width at Half Maximum; FWHMspect.line.widthfloatE_Gamma[0.03/4.2] Upper uncertainty in Gammastat.error;stat.maxfloatH[0/34.1] Mode heightstat.fit.paramfloate_H[0/3.4] Lower uncertainty in Hstat.errorfloatE_H[0/5.3] Upper uncertainty in Hstat.error;stat.maxfloatchi[-62.8/65.1] Asymmetryspect.line.asymmetryfloate_chi[2.5/39] Lower uncertainty in chistat.errorfloatE_chi[2.5/91] Upper uncertainty in chistat.error;stat.maxfloatdeltanu[-2.4/3.4] Frequency shiftuHzem.freqfloate_deltanu[0.029/5] Lower uncertainty in deltanuuHzstat.errorfloatE_deltanu[0.027/3.8] Upper uncertainty in deltanuuHzstat.error;stat.maxfloat