J/ApJ/855/75ivo://CDS.VizieR/J/ApJ/855/75doi:10.26093/cds/vizier.18550075CDSRadick R.R.Lockwood G.W.Henry G.W.Hall J.C.Pevtsov A.A.2019-02-25T13:55:15Z2019-02-11T08:02:01ZCDS support team

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

cds-question@unistra.frthe-sung-starsphotometryvisible-astronomyspectroscopyWe compare patterns of variation for the Sun and 72 Sun-like stars by combining total and spectral solar irradiance measurements between 2003 and 2017 from the SORCE satellite, Stromgren b, y stellar photometry between 1993 and 2017 from Fairborn Observatory, and solar and stellar chromospheric CaII H+K emission observations between 1992 and 2016 from Lowell Observatory. The new data and their analysis strengthen the relationships found previously between chromospheric and brightness variability on the decadal timescale of the solar activity cycle. Both chromospheric H+K and photometric b, y variability among Sun-like stars are related to average chromospheric activity by power laws on this timescale. Young active stars become fainter as their H+K emission increases, and older, less active, more Sun-age stars tend to show a pattern of direct correlation between photometric and chromospheric emission variations. The directly correlated pattern between total solar irradiance and chromospheric Ca ii emission variations shown by the Sun appears to extend also to variations in the Stromgren b, y portion of the solar spectrum. Although the Sun does not differ strongly from its stellar age and spectral class mates in the activity and variability characteristics that we have now studied for over three decades, it may be somewhat unusual in two respects: (1) its comparatively smooth, regular activity cycle, and (2) its rather low photometric brightness variation relative to its chromospheric activity level and variation, perhaps indicating that facular emission and sunspot darkening are especially well-balanced on the Sun.2018ApJ...855...75Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/855/75CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/5 : UBV Photometry of Bright Stars (Johnson+ 1966)II/215 : uvby-beta Catalogue (Hauck+ 1997)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+AS/102/89 : uvby-beta Photometry of G5 stars (Olsen 1993)J/A+AS/104/429 : uvby Photometry of G-type dwarfs (Olsen 1994)J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)J/AJ/138/312 : Activity of bright solar analogs (Hall+, 2009)J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)J/MNRAS/446/2959 : Asterosismology for solar analogues 16 Cyg (Davies+, 2015)J/ApJ/812/12 : S-index and Stroemgren LC of HD30495 (Egeland+, 2015)J/ApJ/835/25 : Calibrated solar S-index time series (Egeland+, 2017)J/ApJ/851/116 : Variability of Kepler sun-like stars (Montet+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/855/75https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/855/75http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/855/75https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/855/75https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/855/75http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/855/75GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/855/75/stars (Stellar with the Lowell/Solar-Stellar Spectrograph (SSS) spectroscopic results (tables 1 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/855/75/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/855/75/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/855/75/stars?GETtext/xml+votable180.050000true6/254 684 2476 2650 3102 3691 5074 5088 5266 5304 5413 5522 5670 5726 5929 6308 6926 7540 7763 8843 9403 9476 9492 10899 11128 12592 12890 12944 13301 14573 15030 15174 16069 16883 17219 17266 17425 17606 17812 17918 18373 20145 20278 21177 21484 22818 23230 23575 23583 23661 24028 24151 24160 24924 25966 26440 26521 26575 28605 30576 30579 30878 30965 31101 31130 31132 31433 31478 40823 40932https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/855/75?format=asciiOpticaldefaultJ/ApJ/855/75/table4Seasonal data filerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHenry Draper Catalog numbermeta.id;meta.maincharAPTEpoch[1993.3/2016.98]? APT mid-season epochyrtime.epochfloatnullableNobs[6/305]? Number of photometric observationsmeta.numberintnullableP-Cavg[-0.03/0.04]? Program star - mean comp. star magnitude (1)magphot.mag;arith.difffloatnullableB_P-Cavg[-0.009/-0.0001]? Upper 95% confidence interval in (P-Cavg)magstat.fit.paramfloatnullableb_P-Cavg[0.0001/0.02]? Lower 95% confidence interval in (P-Cavg)magstat.fit.paramfloatnullableC2-C3[-0.02/0.007]? Comp. 2 - comp. 3 magnitude (1)magphot.mag;arith.difffloatnullableB_C2-C3[-0.004/-0.0001]? Upper 95% confidence interval in C2-C3magstat.fit.paramfloatnullableb_C2-C3[0.0001/0.004]? Lower 95% confidence interval in C2-C3magstat.fit.paramfloatnullableSSSEpoch[1992.7/2016.9]? SSS mid-season epochyrtime.epochfloatnullableNS[1/78]? Number of S index observationsmeta.numberintnullableS[0.1/1]? Seasonal median S indexspect.indexfloatnullableB_S[0.0001/0.2]? Upper 95% confidence interval in Sstat.fit.paramfloatnullableb_S[-0.4/-0.0001]? Lower 95% confidence interval in Sstat.fit.paramfloatnullablelogR'HK[-5.4/-4.3]? Seasonal median logR'HKphot.flux;arith.ratiofloatnullableSeason[1/25] Season number beginning with 1992-93meta.idintJ/ApJ/855/75/starsStellar with the Lowell/Solar-Stellar Spectrograph (SSS) spectroscopic results (tables 1 and 3)SimbadNameSimbad column added by the CDSmeta.idcharn_d/dS[1]? Note on d/dS (5)meta.noteintnullableSE[0.003/0.8]? SE slopestat.fit.paramfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHD identifier or "Sun"meta.id;meta.maincharprimaryVmag[3.4/8.7]? V-band magnitude from I/239magphot.mag;em.opt.VfloatnullableVMag[2/8.4] Absolute V-band magnitude (M_V_)magphot.mag;em.opt.VfloatB-V[0.4/1.4] B-V color index from I/239magphot.color;em.opt.B;em.opt.VfloatSpTMK spectral type from VizieR and SIMBADsrc.spTypecharlogR'HK[-5.3/-4.3] logR'_HK_ value (1)phot.flux;arith.ratiofloatMetric[0/7.6] Metric (2)stat.fit.paramfloatNotesNotes (3)meta.notecharSdatalink to Seasonal data (table 4)meta.ref.urlcharDatesDate range (total span of the measurements)yrtime.epochcharN[1/23] N_n>5_ (4)meta.numberintMeanS[0.1/0.8] Mean long-term SSS S-indexspect.indexfloate_MeanS[0.0003/0.1]? {sigma}S valuestat.errorfloatnullabled/dS[-0.9/1.1]? d(mag)/dSphot.flux;arith.ratiofloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable