J/ApJ/900/154ivo://CDS.VizieR/J/ApJ/900/154doi:10.26093/cds/vizier.19000154CDSMetcalfe T.S.van Saders J.L.Basu S.Buzasi D.Chaplin W.J.,Egeland R.Garcia R.A.Gaulme P.Huber D.Reinhold T.Schunker H.,Stassun K.G.Appourchaux T.Ball W.H.Bedding T.R.Deheuvels S.,Gonzalez-Cuesta L.Handberg R.Jimenez A.Kjeldsen H.Li T.Lund M.N.,Mathur S.Mosser B.Nielsen M.B.Noll A.Celik Orhan Z.Ortel S.,Santos A.R.G.Yildiz M.Baliunas S.Soon W.2022-08-25T11:25:53Z2022-02-02T14:06:09ZCDS support team

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

cds-question@unistra.frmultiple-starsasteroseismologyMost previous efforts to calibrate how rotation and magnetic activity depend on stellar age and mass have relied on observations of clusters, where isochrones from stellar evolution models are used to determine the properties of the ensemble. Asteroseismology employs similar models to measure the properties of an individual star by matching its normal modes of oscillation, yielding the stellar age and mass with high precision. We use 27 days of photometry from the Transiting Exoplanet Survey Satellite to characterize solar-like oscillations in the G8 subgiant of the 94 Aqr triple system. The resulting stellar properties, when combined with a reanalysis of 35yr of activity measurements from the Mount Wilson HK project, allow us to probe the evolution of rotation and magnetic activity in the system. The asteroseismic age of the subgiant agrees with a stellar isochrone fit, but the rotation period is much shorter than expected from standard models of angular momentum evolution. We conclude that weakened magnetic braking may be needed to reproduce the stellar properties, and that evolved subgiants in the hydrogen shell-burning phase can reinvigorate large-scale dynamo action and briefly sustain magnetic activity cycles before ascending the red giant branch.2020ApJ...900..154Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/900/154CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)I/276 : Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002)I/345 : Gaia DR2 (Gaia Collaboration, 2018)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)J/ApJ/457/L99 : 25yr CaII-HK observations of F-K nearby stars (Baliunas+, 1996)J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)J/AJ/145/41 : Radial velocities of 33 spectroscopic binaries (Katoh+, 2013)J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)J/A+A/572/L5 : Evolution state of red giants from seismology (Mosser+, 2014)J/A+A/573/A89 : STAGGER-grid of 3D stellar models. III. (Magic+, 2015)J/A+A/580/A23 : Stroemgren-Crawford uvby{beta} photometry cat. (Paunzen, 2015)J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)J/ApJ/831/L6 : Eclipsing binary parallaxes with Gaia data (Stassun+, 2016)J/A+A/601/A67 : Kepler solar-type stars modeling (Creevey+, 2017)J/ApJ/835/25 : Calibrated solar S-index time series (Egeland+, 2017)J/ApJS/233/23 : APOKASC catalog of KIC dwarfs and subgiants (Serenelli+, 2017)J/AJ/153/136 : Planets and their host stars with Gaia plx (Stassun+, 2017)J/ApJ/858/28 : Mixing-length parameter for a sample of KIC (Viani+, 2018)J/ApJS/241/12 : The Asteroseismic Target List (ATL) for TESS (Schofield+, 2019)J/ApJ/888/43 : APOGEE-Kepler Cool Dwarf star ages (Claytor+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/900/154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/900/154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/900/154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/900/154https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/900/154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/900/154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/900/154/fig2Long-term variability of 94 Aqr A and 94 Aqr B from the Mount Wilson S-index datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier ("219834A" or "219834B")meta.id;meta.maincharJDJulian Date; JD-2440000dtime.epochdoubleS-Index[0.135/0.36] S-Index valuespect.indexfloat