J/A+A/520/A79ivo://CDS.VizieR/J/A+A/520/A79doi:10.26093/cds/vizier.35200079CDSMartinez-Arnaiz R.Maldonado J.Montes D.Eiroa C.Montesinos B.2017-10-18T08:25:00Z2010-10-06T16:40:58ZCDS support team

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

cds-question@unistra.frlate-type-starsradial-velocityline-intensitiesChromospheric activity produces both photometric and spectroscopic variations that can be mistaken as planets. Large spots crossing the stellar disc can produce planet-like periodic variations in the light curve of a star. Moreover, spots clearly affect the spectral line profiles. Such perturbations will in turn affect the line centroids creating a radial velocity jitter that might "contaminate" the variations induced by a planet. Precise chromospheric activity measurements are needed to estimate the activity-induced noise that should be expected for a given star. The purpose of this paper is to obtain precise chromospheric activity measurements and projected rotational velocities for nearby (d<25pc) cool (spectral types F to K) stars, in order to estimate the activity-related jitter that should be expected for them. As a complementary objective, in this paper we aim to obtain relationships between fluxes in different activity indicator lines, which will permit a transformation of traditional activity indicators, i.e, CaII H & K lines, to other which hold noteworthy advantages. We used high resolution (~50000) echelle optical spectra. Standard data reduction was performed using the IRAF echelle package. To reveal the chromospheric emission of the stars in the sample we used the spectral subtraction technique. We measured equivalent widths of the chromospheric emission lines in the subtracted spectrum and transformed them into fluxes by applying empirical equivalent width-flux relationships. Rotational velocities were determined using the cross-correlation technique. To infer activity-related radial velocity (RV) jitter we used empirical relationships between this and the R'HK index. We have measured chromospheric activity, as given by different indicators throughout the optical spectra, and projected rotational velocities for 371 nearby cool stars. We have built empirical relationships among the most important chromospheric emission lines. Finally, we have used the measured chromospheric activity to estimate the expected RV jitter for the active stars in the sample.2010A&A...520A..79Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/520/A79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/331/581 : Rotation and activity in field M dwarfs (Delfosse+ 1998)J/A+A/469/309 : Chromospheric activity in late-type stars (Cincunegui+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/520/A79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/520/A79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/520/A79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/520/A79https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/520/A79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/520/A79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/520/A79/tablea1 (Stellar parameters of the stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/520/A79/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/520/A79/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/520/A79/tablea1?GETtext/xml+votable180.050000true0.542313327.08225610.0055555555555555566/60 100 137 181 237 259 377 684 819 1033 1341 1530 1603 1875 2092 2167 2317 2472 2476 2572 2622 2652 2697 2923 2937 3020 3102 3147 3313 3372 3509 3639 3780 3915 4118 4227 4241 4278 4316 4591 4620 4762 4854 4942 5009 5034 5074 5154 5207 5304 5309 5413 5434 5522 5670 5726 5802 5836 5853 5899 6049 6066 6226 6308 6339 6409 6523 6647 6662 6752 6766 6783 6926 6941 6953 7238 7264 7390 7595 7763 7854 8094 8109 8145 8219 8343 8357 8424 8476 8591 8663 8746 8773 8788 8790 8843 8845 8887 8985 8993 8995 9125 9128 9327 9476 9492 9801 10225 10313 10325 10375 10812 10899 10914 11126 11290 11633 11806 12228 12330 12340 12388 12390 12494 12592 12654 12798 12846 12856 12944 13036 13301 13440 13487 13547 13568 13674 13763 13769 13778 14278 14522 14539 15243 15597 15746 16069 16105 16213 16678 17028 17171 17219 17253 17266 17314 17425 17486 17572 17588 17607 17714 17875 17944 18115 18139 18299 18441 18614 18641 18734 19109 19219 19323 19327 19585 19816 19836 19912 20145 20278 20328 20701 20957 21060 21177 21185 21197 21285 21484 21691 21703 21726 21838 21912 22040 22277 22300 22490 22708 22761 22813 22818 22836 23096 23140 23177 23190 23230 23369 23575 23583 23661 23675 23974 24016 24028 24036 24102 24117 24151 24558 24713 24924 24990 25003 25046 25342 25407 25477 25793 25863 25869 25880 25906 25966 26016 26174 26379 26429 26462 26468 26521 26575 26652 26676 26761 26906 26924 26975 27109 27201 27268 27335 27374 27462 27954 27973 27980 28122 28180 28400 28605 28664 28987 29084 29196 29213 29680 29756 29961 30015 30257 30343 30490 30529 30604 30759 30878 30965 31011 31087 31101 31130 31132 31145 31393 31399 31425 31433 31478 31545 31720 31742 31751 31768 32001 32192 32318 32372 32520 32645 32757 33281 33552 33849 34446 34817 34896 35079 35753 35802 35948 36145 36248 36288 36365 36379 36412 36418 36446 36454 36483 36664 36693 36697 36735 37408 38238 39284 40078 40242 40679 40692 40784 40830 40892 40932 41272 41397 41463 41687 41763 42285 42760 44151 44284 44366 44482 44669 44792 44833 44860 44879 45013 45485 45669 46247 47101 47589 48355 48652 48705 48923 48964 49060https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/520/A79?format=asciiOpticaldefaultJ/A+A/520/A79/tablea1Stellar parameters of the starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintESimbad column added by the CDSmeta.ref.urlcharHIPHIP number of the starmeta.idintprimaryn_HIP[+* ] Notes (1)meta.notecharMJDModified Julian Datedtime.epochdoubleRAJ2000Right ascension (J2000.0)pos.eq.raDEJ2000Declination (J2000)pos.eq.decB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatSpTypeMK spectral typesrc.spTypecharl_vsini[>= ] Limit flag on vsinimeta.code.error;phys.veloc.rotatcharvsini? Projected rotational velocitieskm/sphys.veloc.rotat;phys.mol.rotationfloatnullableActivActivity of the starmeta.notecharSimbadSimbad column added by the CDSchar_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.mainSpectSpectrograph usedmeta.id;instrcharJ/A+A/520/A79/tablea2Excess emission (equivalent widths)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP number of the starmeta.id;meta.mainintSpectSpectrograph usedmeta.id;instrcharMJDModified Julian Date of observationdtime.epochdoubleW(K)? CaII K excess emission equivalent width0.1nmspect.line.eqWidth;em.IR.Kfloatnullablee_W(K)? Error in W(K)0.1nmstat.errorfloatnullableW(H)? CaII H excess emission equivalent width0.1nmspect.line.eqWidth;em.IR.Hfloatnullablee_W(H)? Error in W(H)0.1nmstat.errorfloatnullableW(Ha)? H{alpha} excess emission equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_W(Ha)? Error in W(H{alpha})0.1nmstat.errorfloatnullableW(IRT1)? CaII IRT1 excess emission equivalent width0.1nmspect.line.eqWidthfloatnullablee_W(IRT1)? Error in W(IRT1)0.1nmstat.errorfloatnullableW(IRT2)? CaII IRT2 excess emission equivalent width0.1nmspect.line.eqWidthfloatnullablee_W(IRT2)? Error in W(IRT2)0.1nmstat.errorfloatnullableW(IRT3)? CaII IRT3 excess emission equivalent width0.1nmspect.line.eqWidthfloatnullablee_W(IRT3)? Error in W(IRT3)0.1nmstat.errorfloatnullableJ/A+A/520/A79/tablea3Excess emission (Flux) & logR'HKrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP number of the starmeta.id;meta.mainintSpectSpectrograph usedmeta.id;instrcharMJDModified Julian Date of observationdtime.epochdoubleF(K)? CaII K excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(K)? Error logF(K)log(mW.m**-2)stat.errorfloatnullableF(H)? CaII H excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(H)? Error logF(H)log(mW.m**-2)stat.errorfloatnullableF(Ha)? H{alpha} excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(Ha)? Error logF(H{alpha})log(mW.m**-2)stat.errorfloatnullableF(IRT1)? CaII IRT1 excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(IRT1)? Error logF(IRT1)log(mW.m**-2)stat.errorfloatnullableF(IRT2)? CaII IRT2 excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(IRT2)? Error logF(IRT2)log(mW.m**-2)stat.errorfloatnullableF(IRT3)? CaII IRT3 excess emission flux (log)log(mW.m**-2)phot.fluxfloatnullablee_F(IRT3)? Error logF(IRT3)log(mW.m**-2)stat.errorfloatnullablelog(R'HK)? Activity index derived from the CaII H+K linesphot.flux;arith.ratiofloatnullableJ/A+A/520/A79/tablea4Estimated radial velocity jitterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP number of the starmeta.id;meta.mainintf_HIP[d] d for stars with log(R'HK)<-4.9meta.codecharSpectSpectrograph usedmeta.id;instrcharMJDModified Julian Datedtime.epochdoubleSpTypeMK spectral typesrc.spTypecharlog(R'HK)Activity index derived from CaII H+K linesphot.flux;arith.ratiofloatsigRV1.lLower value of estimated RV jitter from Saar et al., 1998ApJ...498L.153Sm/sstat.stdev;phys.velocintsigRV1.uUpper value of estimated RV jitter from Saar et al., 1998ApJ...498L.153Sm/sstat.stdev;phys.velocintsigRV2.lLower value of estimated RV jitter from Santos et al., 2000A&A...361..265Sm/sstat.stdev;phys.velocintsigRV2.uUpper value of estimated RV jitter from Santos et al., 2000A&A...361..265Sm/sstat.stdev;phys.velocint