J/MNRAS/517/1849ivo://CDS.VizieR/J/MNRAS/517/1849doi:10.26093/cds/vizier.75171849CDSBoulkaboul A.Damerdji Y.Morel T.Fremat Y.Soubiran C.Gosset E.,Abdelatif T.E.2024-08-22T20:16:24Z2022-10-31T09:18:05ZCDS support team

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

cds-question@unistra.frstandard-starsradial-velocityvisible-astronomyOur main aim is to test the non-variability of the radial velocity (RV) of a sample of 2351 standard stars used for wavelength calibration of the Radial Velocity Spectrometer (RVS) instrument onboard Gaia . In this paper, we present the spectroscopic analysis of these stars with the determination of their physical parameters by matching observed and synthetic spectra. Weestimate the offset between different instruments after determining the shift between measured and archived RVs since the instrument pipelines use various numerical masks. Through the confirmation of the stability of the target RVs, we find 68 stars with a long-term variation having an acceleration that exceeds 10m/s/yr. This suggests a barycentric reflex motion caused by a companion. As activity phenomena may be the source of periodic and trend-like RV variations in stars with putative planetary companions, we analysed various activity indicators in order to check their correlations to the RV changes. Among the trend stars, 18 have a trend model scatter greater than 100m/s^ over a time span from 10 to 12 yr. We also confirm that six stars with known substellar companions have a total model scatter, 3{sigma}, exceeding the threshold set by Gaia, that is, 300m/s. In addition, TYC8963-01543-1, an SB2 star, has data scatter {sigma}=176.6m/s. Four more other stars are revealed to be variable after combining data from different instruments. Despite the presence of low-amplitude changes, a very large fraction of our sample (98.8 per cent) appears suitable as RV calibrators for Gaia RVS.2022MNRAS.517.1849Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/1849CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/616/A7 : Gaia DR2 radial velocity standard stars catalogJ/A+A/636/A74 : HARPS radial velocity database (Trifonov+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/517/1849https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/517/1849http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/517/1849https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/517/1849https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/517/1849http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/517/1849GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/517/1849/table1 (List of targets: coordinates, spectral type from CS18 (Soubiran et al., 2018, Cat. J/A+A/616/A7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/517/1849/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/517/1849/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/517/1849/table1?GETtext/xml+votable180.050000true0.1349919-56.83560060.0055555555555555566/49 60 151 185 200 222 228 236-237 248 251 256 277 295 309 311 322-323 336 346 398 400 405 408 414 418 455 464 472 475 481 483 498 500 521 524 544 552 569 618 620 634 650 679 697 706 712-713 719-720 737 742 798 802 814 871 917-918 928 934 944 946 964 982 997 1005 1024 1028 1030-1031 1042 1098 1136 1151 1186 1188 1202 1237 1247 1260 1320 1355 1387 1408 1530-1531 1576 1597 1603 1623 1645 1711 1718 1775 1786 1790 1881 1895 1901 1914 1932 1968 1984 1997 2032 2063 2110-2111 2114 2118 2144 2149 2158 2222 2229 2261 2274 2287 2290 2336 2379 2416 2418 2424 2472 2491 2497 2565 2622 2652-2653 2658 2777 2815-2816 2829 2870 2880 2919 2926 2961 3003 3026 3071 3085 3121 3126 3147 3195 3197 3199 3217 3239 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43290 43306 43310 43315 43330 43345 43374 43525 43544 43555 43558 43610 43612 43639 43641 43649 43665 43668 43672 43724 43760 43771 43778 43781 43800-43801 43813 43818 43954 43977 44025 44115 44131 44151 44208 44243 44260 44262 44287 44340 44359 44374 44398 44442 44600 44608 44637-44638 44653 44681 44683 44753 44769 44812 44853 44879 44883 44887 44918 44931 44937 44951 44974 45021 45034 45078 45112 45143 45182 45204 45237 45265 45299 45309 45334 45337 45412 45422 45446 45492 45502 45511 45559 45589 45608 45640-45641 45646 45656 45668 45682 45717 45721 45752 45758 45792 45823 45853 45865 45873 45902 45907 45917 45924 45948 45974 46004 46009 46053 46056 46074 46076 46084 46111 46113 46118 46171-46172 46193 46203 46215 46234 46248-46249 46252 46287 46297 46306 46333 46355 46357 46364 46437 46494 46501 46559 46603 46639 46646 46664 46671 46681 46687 46728 46734 46768 46800 46805 46829 46874 46881 46887 46923 46933 46936 46944 46967 46971 46983 47004 47020 47022 47030 47045 47065 47073 47137 47184 47253 47308 47364 47377 47390 47407 47567 47590 47629 47647 47655 47712 47740 47758 47780 47803 47858 47894 47903 47930 47935 47942 48014 48022 48105 48113 48172 48182 48205 48238 48260 48335 48350 48362 48371 48402 48490 48519 48572 48581 48595 48607 48652 48664 48679 48705 48707 48711 48727 48731 48736 48757 48788 48792 48821 48847-48848 48865 48870-48871 48964 48980 49010 49026 49028 49036 49042 49064 49097 49114 49128https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/517/1849?format=asciiOpticaldefaultJ/MNRAS/517/1849/table1List of targets: coordinates, spectral type from CS18 (Soubiran et al., 2018, Cat. J/A+A/616/A7)SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHIP/TYC target namemeta.id;meta.maincharRAdegRight ascension (ICRS) at Epochdegpos.eq.raDEdegDeclination (ICRS) at Epochdegpos.eq.decEpochSpecific epochyrtime.epochfloatVmagVisual apparent magnitudemagphot.mag;em.opt.VfloatSpTypeSpectral typesrc.spTypecharTTotal time spandtime.intervalfloatmin(SNR)Minimum values of signal to noise ratiostat.snr;stat.minfloatmax(SNR)Maximum values of signal to noise ratiostat.snr;stat.maxfloatNinitTotal number of analysed spectrameta.numberintNFinal number of measurements after filteringmeta.numberintNaddNumber of additional spectra compared to CS18 (Soubiran et al., 2018, Cat. J/A+A/616/A7)meta.numberintInstThe instrument used (H, S, E, N for HARPS, SOPHIE, ELODIE and NARVAL respectively)instr.setupchar_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.mainJ/MNRAS/517/1849/table2Stellar parameters of the best-fitting synthetic spectraInst[HSEN] The instrument used (1)instr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHIP/TYC target namemeta.id;meta.maincharTeff? Effective temperatureKphys.temperature.effectiveintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullable[Fe/H]? Metallicityphys.abund.Zfloatnullable[alpha/Fe]? ratio of {alpha} elementsphys.abundfloatnullablel_vbroadLimit flag on vbroadmeta.code.errorcharvbroad? rotation velocitykm/sphys.veloc.rotatfloatnullablen_vbroad[c]meta.notecharl_e_vbroadLimit flag on e_vbroadmeta.code.errorchare_vbroad? Uncertainty on vbroadkm/sstat.errorfloatnullableRVmean? This work mean measured RVkm/sphys.veloc;pos.heliocentricdoublenullablee_RVmean? Uncertainty on mean measured RVkm/sstat.errorfloatnullableRVmedCS18Median RV from CS18km/sphys.veloc;pos.heliocentricdoublee_RVmedCS18Uncertainty on median RV from CS18km/sstat.errorfloatJ/MNRAS/517/1849/table3Orthogonal regression coefficients of the fit between our measured and T20 RVs and number of analyzed spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHIP/TYC target namemeta.id;meta.mainchara-pre? Slope HARPS fibre pre-upgradestat.fit.paramfloatnullablee_a-pre? Error of slope pre-upgradestat.errorfloatnullableb-pre? Y-intercept HARPS fibre pre-upgradekm/sstat.fit.paramdoublenullablee_b-pre? Error of Y-intercept pre-upgradekm/sstat.errorfloatnullablea-post? Slope HARPS fibre post-upgradestat.fit.paramfloatnullablee_a-post? Error of slope post-upgradestat.errorfloatnullableb-post? Y-intercept HARPS fibre post-upgradekm/sstat.fit.paramdoublenullablee_b-post? Error of Y-intercept post-upgradekm/sstat.errorfloatnullable