J/A+A/641/A110ivo://CDS.VizieR/J/A+A/641/A110doi:10.26093/cds/vizier.36410110CDSGondoin P.2021-04-27T10:57:15Z2020-09-16T06:50:20ZCDS support team

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

cds-question@unistra.frlate-type-starsvisible-astronomynarrow-band-photometryThe chromospheric emission in the cores of the CaII H & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age. I use this indicator to investigate the formation history of nearby G- and early K-type stars with origins at galactocentric distances similar to that of the region where the Sun was born. A parent sample of single main-sequence stars with near-solar metallicity and known magnetic activity levels is built from catalogues of stellar atmospheric parameters and chromospheric activity indices. A kinematical approach uses Gaia astrometric data to differentiate thin disc stars from thick disc stars. Measured distributions of R'_HK_ chromospheric activity indices are compared with Monte Carlo simulations based on an empirical model of chromospheric activity evolution. The thin disc includes a significant fraction of Sun-like stars with intermediate activity levels while most early K- and G-type stars from the thick disc are inactive. The chromospheric activity distribution among nearby Sun-like dwarfs from the thin disc can be explained by a combination of an old (>6-7Gyr) star formation event (or events) and a more recent (<3Gyr) burst of star formation. Such an event is not required to account for the R'_HK_ index distributions of nearby thick disc stars. The distribution of magnetic activity among local G- and early K-type stars with a near-solar metallicity bears the imprint of an important star formation event that occurred ~1.9 to 2.6Gyr ago in the thin disc of the Milky Way.2020A&A...641A.110Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/641/A110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/641/A110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/641/A110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/641/A110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/641/A110https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/641/A110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/641/A110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/641/A110/tableb1 (Stellar properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A110/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A110/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A110/tableb1?GETtext/xml+votable180.050000true0.1680003-69.67596560.0055555555555555566/49 60 100 118 348 377 815 892 944 1058 1098 1296 1330 1452 1530 1603 1642 1875 1914 2167 2169 2476 2622 2651 3083 3372 3691 3697 3932 3979 4278 4591 4762 5088 5143 5309 5413 5484 5522 5670 5726 5824 6256 6308 6699 6941 6953 7286 7299 7595 7763 7868 7978 8109 8224 8279 8342 8424 8466 8591 8614 8716 8746 8788 8881 8896 9179 9354 9443 9553 9602 9662 9679 9801 9811 10325 10518 10701 10914 11150 11163 11314 11391 11405 11510 11713 11732 11806 12592 12846 12856 12890 13164 13487 13547 13568 13620 13749 13763 13769 14007 14290 14502 14649 14662 15030 15044 15154 15174 15373 15620 15962 16069 16185 16412 16463 16502 16518 16528 16543 16603 16639 16652 16679 16689 16883 16890 16986 16995 17177 17314 17435 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29756 29784 29800 29833 29838 29842 29978 30048 30195 30419 30471 30789 30798 30862 30937 31029 31101 31130 31287 31399 31433 31768 31785 31821 32029 32035 32211 32328 32399 32473 32509 32561 32986 33042 33063 33082 33091 33179 33201 33210 33212 33219 33252 33311 33357 33416 33418 33442 33499 33510 33630 33662 33705 33717 33756 33788 33813 33849 33879 33945 34039 34172 34290 34508 34515-34517 34530 34536 34577 34591 34612 34673-34674 34739 34864 34896 34905 34924 34947 34953 34966 34994 35017 35027 35064 35074 35119 35121 35228 35339 35349 35362 35468 35502 35532 35668 35707 35733 35753 35776 35781 35784 35786 35790 35811 35831 35876 35896 35928 35948 35954 35968-35969 36008 36015 36019 36057 36069 36115 36238 36288 36365 36418 36446 36541 36635 36664 36713 36762 37018 37074 37308 37357 37408 37419 37422 37595 37616 37725 37808 37890 37954-37955 37962 38099 38229 38279 38311 38330 38339 38342 38414 38443 38508 38521 38545 38559 38562 38807 38834 38836 38857 38870 38918 38944 38955 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46925 46956 46967 46982-46983 46987 46992 46997 47020 47022 47045 47061 47184 47198 47234 47258 47364 47377 47390 47543 47550 47629 47740 47791 47858 47898 48065 48283 48291 48371 48394 48519 48530 48545 48607 48664 48705 48768 48792 48821 48846 48870-48871 48883 49010 49064https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/641/A110?format=asciiOpticaldefaultJ/A+A/641/A110/tableb1Stellar propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1/691] Sequential numbermeta.idintNameStar's namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypecharRAdegGaia DR2 right ascension (ICRS) at Ep=2015.5degpos.eq.raDEdegGaia DR2 declination (ICRS) at Ep=2015.5degpos.eq.decplxGaia DR2 parallaxmaspos.parallax.trigdoubleUVelocity (LSR) towards Galactic centrekm/sphys.veloc;pos.galacticdoubleVVelocity (LSR) along Galaxy rotationkm/sphys.veloc;pos.cartesian.ydoubleWVelocity (LSR) towards North Galactic polekm/sphys.veloc;pos.galacticdoubleB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatVMAGAbsolute V magnitudemagphys.magAbsfloatlogR'HKLogarithm of R'_HK_ chromospheric activity indexphot.flux;arith.ratiodouble[Fe/H]Metallicityphys.abund.Zfloats_[Fe/H]Median absolute deviation of [Fe/H]stat.stdev;phys.abund.Fe;stat.medianfloatPRThick disc over thin disc membership probabilitystat.fit.goodnessdoubleSimbadNameSimbad column added by the CDSmeta.idchar_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