J/A+A/566/A66ivo://CDS.VizieR/J/A+A/566/A66doi:10.26093/cds/vizier.35660066CDSGomes da Silva J.Santos N.C.Boisse I.Dumusque X.Lovis C.2023-04-03T12:27:52Z2014-10-08T09:57:35ZCDS support team

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

cds-question@unistra.frlate-type-starschemical-abundancesThe re-emission in the cores of the CaII H & K and H{alpha} lines are well known proxies of stellar activity. However, these activity indices probe different activity phenomena: the first is more sensitive to plage variation, while the other is more sensitive to filaments. In this paper, we study the long-term correlation between logR'_HK_ and logI_H{alpha}_, two indices based on the CaII H & K and H{alpha} lines, respectively, for a sample of 271 FGK stars using measurements obtained over a ~9-year time span. Because stellar activity is one of the main obstacles to the detection of low-mass and long-period planets, understanding this activity index correlation further can give us some hints about the optimal target to focus on ways to correct for these activity effects. We found a great variety of long-term correlations between logR'_HK_ and logI_H{alpha}_. Around 20% of our sample has a strong positive correlation between the indices while about 3% show strong negative correlation. These fractions are compatible with those found for the case of early-M dwarfs. Stars exhibiting a positive correlation have a tendency to be more active when compared to the median of the sample, while stars showing a negative correlation are more present among higher metallicity stars. There is also a tendency for the positively correlated stars to be more present among the coolest stars, a result which is probably due to the activity level effect on the correlation. Activity level and metallicity therefore seem to be playing a role on the correlation between logR'_HK_ and logI_H{alpha}_. Possible explanations based on the influence of filaments for the diversity in the correlations between these indices are discussed in this paper. As a parallel result, we show a way to estimate the effective temperature of FGK dwarfs that exhibit a low activity level by using the H{alpha} index.2014A&A...566A..66Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/566/A66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/626/446 : Effective temperature scale of FGK stars (Ramirez+, 2005)J/MNRAS/371/879 : Effective temperatures of 215 FGK giants (Kovtyukh+, 2006)J/MNRAS/389/1336 : Reddenings of FGK supergiants + Cepheids (Kovtyukh+, 2008)J/A+A/487/373 : 451 HARPS-GTO stars spectroscopic parameters (Sousa+, 2008)J/A+A/520/A79 : Nearby FGK stars chromospheric activityJ/A+A/533/A141 : Stellar parameters for 582 HARPS FGK stars (Sousa+, 2011)J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)J/A+A/547/A106 : Li abundances in the FGK dwarfs (Mishenina+, 2012)J/ApJ/735/41 : Carbon and oxygen abundances in FGK stars (Petigura+, 2011)J/A+A/552/A27 : Stellar activity and kinematics of FGK stars (Murgas+, 2013)J/A+A/556/A86 : FGK dwarf stars limb darkening coefficients (Neilson+, 2013)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/566/A66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/566/A66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/566/A66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/566/A66https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/566/A66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/566/A66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/566/A66/results (Results for the 271 stars (tables B1 and B2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/566/A66/results?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/566/A66/results?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/566/A66/results?GETtext/xml+votable180.050000true182.7413869-46.32198280.0055555555555555566/16603 16639 17218 17266 17314 17419 17425 17435 17453 17529 17540 17641 17714 17768 17804 17944 18005 18615 18641 18711 18792 19003 20557 20593 20640 20746 20766 20873 21066 21117 21121 21211 21400 21412 21477 21484 21516 21779 21912 22159 22608 22613 22619 22708 22746 22813 23096 23123 23177 24729 24769 24831 24924 25078 25102 25225 25567 25584 25622 25880 25889 25906 26652 26768 26828 26888 26906 28719 28874 28894 28961 29289 29349 29675 29833 29838 29842 29900 30343 30848 30878 30943 30951 31011 31029 32787 32912 32986 33063 33082 33091 33210 33219 33357 33418 33430 33510 33552 33608 33662 33705 33813 33879 33945 34336 34442 34446 34530 34817 34864 35121 35230 35440 35468 35691 35733 35784 35831 35896 35954 35969 36015 36019 36089 36288 36590 36635 36800 36813 37074 37208 37357 37419 37595 37660 37807-37808 37831 38099 38229 38238 38279 38311 38339 38414 38434 38443 38461 38562 38605 38738 38742 38788 38807 38857 38955 38975 38998 39034 39219 39282-39283 39377 39422 39461 39576 39767 39915 40007 40078 40105 40317 40453 40514 40686-40687 40722 40802 40938 41058 41094 41143 41204 41463 41521 41590 41611-41612 41687 41723 41752 41861 41912 41941 41954 41969 42022 42146 42171 42326 42448 42460 42595 42700 42814 42845 42918 43258 43290 43345 43544 43649 43724 43813 43928 43977 44115 44131 44150 44262 44879 45121 45182 45265 45299 45334 45502 45564 45627 45641 45668-45669 45717 45823 46076 46080 46135 46172 46193 46234 46247 46306 46640 46664 46681 46768 46874 47020 47022 47045 47253 47364 47390 47629 47740 47780 47858 47898 47903 48172 48519 48530 48607 48652 48664 48705 48821 48846 49114 49128https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/566/A66?format=asciidefaultJ/A+A/566/A66/resultsResults for the 271 stars (tables B1 and B2)SimbadNameSimbad column added by the CDSmeta.idcharnullableTeffEffective temperatureKphys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharNobs[10/279] Number of observationsmeta.numberintTspan[340/3278] Span timedtime.intervalintCmeta.codecharrho[-1/1] Correlation coefficient {rho} between logR'_HK_ and logI_H{alpha}_ indicesstat.correlationfloat[Fe/H]Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloate_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveint<logR'HK>Mean logR'_HK_ indexphot.flux;arith.ratiofloate_<logR'HK>rms uncertainty on <logR'HK>stat.errorfloat<logIHa>Mean logI_H{alpha}_ indexphot.flux;arith.ratiofloate_<logIHa>rms uncertainty on <logIHa>stat.errorfloat_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