J/A+A/686/A93ivo://CDS.VizieR/J/A+A/686/A93doi:10.26093/cds/vizier.36860093CDSGehan C.Godoy-Rivera D.Gaulme P.2024-11-29T20:03:28Z2024-06-04T08:55:40ZCDS support team

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

cds-question@unistra.frgiant-starsasteroseismologyspectroscopyvisible-astronomyPrevious studies have found that red giants (RGs) in close binary systems undergoing spin-orbit resonance exhibit an enhanced level of magnetic activity with respect to single RGs rotating at the same rate, from measurements of photometric variability, S'_ph_, and the chromospheric emission S-index, S_CaII_. Here, we consider a sample of 4465 RGs observed by the NASA Kepler mission, for which previous studies have measured S'_ph_ and S_CaII_, in order to measure additional activity indicators that probe different heights in the chromosphere: the near-ultraviolet (NUV) excess from NASA GALEX photometric data, and chromospheric indices based on the depth of H_{alpha}_, MgI, and infrared CaII absorption lines from LAMOST spectroscopic data. Firstly, as for CaII H&K, we observe that RGs belonging to close binaries in a state of spin-orbit resonance display larger chromospheric emission than the cohort of RGs, as is illustrated by an NUV excess and shallower H_{alpha}_ and infrared CaII lines. We report no excess of MgI emission. This result reinforces previous claims that tidal locking leads to enhanced magnetic fields, and allows us to provide criteria to classify active RGs - single or binary - based on their rotation periods and magnetic activity indices. Secondly, we strikingly observe that the depths of the MgI and H_{alpha}_ lines are anticorrelated and correlated, respectively, with the amplitude of solar-like oscillations for a given surface gravity, logg, regardless of the presence of photometric rotational modulation. Such a correlation opens up future possibilities of estimating the value of magnetic fields at the surface of RG stars, whether quiet or active, by combining spectroscopic and asteroseismic measurements with three-dimensional atmospheric models that include radiative transfer.2024A&A...686A..93Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/686/A93CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/A+A/639/A63 : Active red giants asteroseismic + rotation param.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/686/A93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/686/A93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/686/A93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/686/A93https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/686/A93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/686/A93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/686/A93/s-lines (Chromospheric indices and associated uncertainties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A93/s-lines?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A93/s-lines?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A93/s-lines?GETtext/xml+votable180.050000true291.055916136.55992420.0055555555555555564/922-923 933-935 944-946 5/3645-3647 3683 3704 3706 3729-3731 3760 3788-3789 3792 6/14559 14567 14573 14575 14577-14579 14730-14731 14744 14746-14747 14749-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15160-15161 15172-15174 15176 15178 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/686/A93?format=asciiOpticaldefaultJ/A+A/686/A93/s-linesChromospheric indices and associated uncertaintiesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC numbermeta.id;meta.mainlong2MASS2MASS designationmeta.idcharKepmagKepler magnitudemagphot.mag;em.optfloatflagActOsc[0/60] Activity and oscillation flag (1)meta.code.errorintEvolStatus[0/2] Red giant evolutionary state (2)meta.codeintProt? Rotation perioddtime.periodfloatnullablelogg? Asteroseismic logglog(cm.s**-2)phys.gravityfloatnullablee_logg? Error on logglog(cm.s**-2)stat.errorfloatnullableNUVxs? NUV excessmagphot.color.excessdoublenullablee_NUVxs? Error on the NUV excessmagstat.errordoublenullableSCaHK? CaII H&K indexspect.indexdoublenullablee_SCaHK? Error on the CaII H&K indexstat.errordoublenullableSMg? MgI indexspect.indexdoublenullablee_SMg? Error on the MgI indexstat.errordoublenullableSFe? FeI indexspect.indexdoublenullablee_SFe? Error on the FeI indexstat.errordoublenullableSHalpha? Halpha indexspect.index;em.line.Halphadoublenullablee_SHalpha? Error on the Halpha indexstat.errordoublenullableSCaIR? CaII IR indexspect.indexdoublenullablee_SCaIR? Error on the CaIR indexstat.errordoublenullable_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.main