J/ApJ/921/122ivo://CDS.VizieR/J/ApJ/921/122doi:10.26093/cds/vizier.19210122CDSMetcalfe T.S.van Saders J.L.Basu S.Buzasi D.Drake J.J.,Egeland R.Huber D.Saar S.H.Stassun K.G.Ball W.H.Campante T.L.,Finley A.J.Kochukhov O.Mathur S.Reinhold T.See V.Baliunas S.,Soon W.2023-06-15T09:21:24Z2023-03-30T08:24:38ZCDS support team

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

cds-question@unistra.frasteroseismologyg-starsstellar-radiistellar-massesstellar-agesvisible-astronomyx-ray-sourcesDuring the first half of main-sequence lifetimes, the evolution of rotation and magnetic activity in solar-type stars appears to be strongly coupled. Recent observations suggest that rotation rates evolve much more slowly beyond middle age, while stellar activity continues to decline. We aim to characterize this midlife transition by combining archival stellar activity data from the Mount Wilson Observatory with asteroseismology from the Transiting Exoplanet Survey Satellite (TESS). For two stars on opposite sides of the transition (88 Leo and {rho} CrB), we independently assess the mean activity levels and rotation periods previously reported in the literature. For the less active star ({rho} CrB), we detect solar-like oscillations from TESS photometry, and we obtain precise stellar properties from asteroseismic modeling. We derive updated X-ray luminosities for both stars to estimate their mass-loss rates, and we use previously published constraints on magnetic morphology to model the evolutionary change in magnetic braking torque. We then attempt to match the observations with rotational evolution models, assuming either standard spin-down or weakened magnetic braking. We conclude that the asteroseismic age of {rho} CrB is consistent with the expected evolution of its mean activity level and that weakened braking models can more readily explain its relatively fast rotation rate. Future spectropolarimetric observations across a range of spectral types promise to further characterize the shift in magnetic morphology that apparently drives this midlife transition in solar-type stars.2021ApJ...921..122Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/122CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/328 : AllWISE Data Release (Cutri+ 2013)II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)J/A+A/619/A73 : Age-chromospheric activity (Lorenzo-Oliveira+, 2018)J/ApJ/457/L99 : 25yr CaII-HK obs. of F-K nearby stars (Baliunas+, 1996)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/ApJ/743/48 : Stars with rot. periods and X-ray luminosities (Wright+, 2011)J/ApJS/199/8 : Interstellar column densities compilation (Gudennavar+, 2012)J/A+A/580/A23 : Stroemgren-Crawford uvby{beta} photometry cat. (Paunzen, 2015)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/ApJ/830/46 : RVs of 3 Neptune-mass planet hosts (Fulton+, 2016)J/AJ/152/180 : Bol. fluxes of eclipsing binaries in Tycho-2 (Stassun+, 2016)J/AJ/153/136 : Planets & their host stars with Gaia plx (Stassun+, 2017)J/ApJ/854/78 : Magnetohydrodynamic (MHD) simulations. II. (Finley+, 2018)J/ApJ/858/28 : Mixing-length param. for a sample of KIC stars (Viani+, 2018)J/ApJS/241/12 : Asteroseismic Target List (ATL) for TESS (Schofield+, 2019)J/ApJ/888/43 : APOGEE-Kepler Cool Dwarf star ages (Claytor+, 2020)J/ApJ/900/154 : Mount Wilson S-Index of 94 Aqr A & 94 Aqr B (Metcalfe+, 2020)J/other/NatAs/5.707 : Dwarf stars asteroseismic rotation rates (Hall+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/921/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/122https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/921/122/table2 (Stellar properties of {rho} CrB and 88 Leo)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/122/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/122/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/122/table2?GETtext/xml+votable180.050000true240.261085333.30351080.0055555555555555566/9403 28180https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/921/122?format=asciiX-rayOpticaldefaultJ/ApJ/921/122/table2Stellar properties of {rho} CrB and 88 Leoe_Prot[0.3/2]? Prot uncertaintydstat.errorfloatnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD identifiermeta.id;meta.mainintprimaryn_HDNote on HD 143761 (rho CRB) (1)meta.notecharlogRHK[-5.177/-4.958]? Chromospheric activity, logR'_HK_[Teff] (see Section 4)phot.flux;arith.ratiofloatnullablee_logRHK[0.015]? logRHK uncertaintystat.errorfloatnullabler_logRHK[1] Reference on logRHK (2)meta.ref;pos.frameintProt[15/20.3]? Rotational perioddtime.periodfloatnullabler_Prot[1] Reference on Prot (2)meta.ref;pos.frameintTeff[5817/6002] Effective temperatureKphys.temperature.effectiveinte_Teff[33/78] Lower uncertainty on TeffKstat.error;phys.temperature.effectiveintE_Teff[32/78] Upper uncertainty on TeffKstat.error;stat.maxintr_Teff[2] Reference on Teff (2)meta.ref;pos.frameint[M/H][-0.2/0.04] Metallicitylog(Sun)phys.abund.Zfloatr_Rad[3] Reference on Rad (2)meta.ref;pos.frameintLum[1.48/1.75] LuminositysolLumphys.luminosityfloate_Lum[0.04/0.1] Lower uncertainty on LumsolLumstat.errorfloatE_Lum[0.036/0.1] Upper uncertainty on LumsolLumstat.error;stat.maxfloatr_Lum[3] Reference on Lum (2)meta.ref;pos.frameintMass[0.96/1.14] MasssolMassphys.massfloate_Mass[0.02/0.07] Mass uncertaintysolMassstat.error;phys.massfloatr_Mass[3] Reference on Mass (2)meta.refintAge[2.4/9.8] AgeGyrtime.agefloate_Age[0.4/0.6] Lower uncertainty on AgeGyrstat.error;time.agefloatE_Age[0.4/0.7] Upper uncertainty on AgeGyrstat.error;stat.maxfloatr_Age[4] Reference on Age (2)meta.ref;pos.frameintLx[0.9/6.1]? X-ray luminosity in 10^27^erg/slog(1e+20W)phys.luminosity;em.X-rayfloatnullablee_Lx[0.19/2.1]? Lx uncertaintylog(1e+20W)stat.errorfloatnullabler_Lx[5] Reference on Lx (2)meta.ref;pos.frameintNsNumber of S-Index measurements for this star (link to fig1.dat)meta.numberintnullableTSTime serie interactive plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.maine_[M/H][0.06/0.07] [M/H] uncertaintylog(Sun)stat.error;phys.abundfloatr_[M/H][2] Reference on [M/H] (2)meta.ref;pos.frameintlogg[4.19/4.38] Log of surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.008/0.08] logg uncertaintylog(cm.s**-2)stat.errorfloatr_logg[2] Reference on logg (2)meta.ref;pos.frameintRad[1.127/1.31] RadiussolRadphys.size.radiusfloate_Rad[0.01/0.04] Rad uncertaintysolRadstat.errorfloatJ/ApJ/921/122/fig1Time series for {rho} CrB (HD 143761) and 88 Leo (HD 100180)SInd[0.127/0.4] S-Index valuespect.indexfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD identifiermeta.id;meta.mainintJD[-804.2/12439.8] Julian Date; JD-2440000dtime.epochdouble