Chromospheric activity for CPS stars J/ApJ/725/875 ivo://CDS.VizieR/J/ApJ/725/875 doi:10.26093/cds/vizier.17250875 CDS Isaacson H. Fischer D. 2021-09-07T05:48:43Z 2012-08-27T12:02:34Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr spectroscopy late-type-stars stellar-ages We present time series measurements of chromospheric activity for more than 2600 main-sequence and subgiant stars on the California Planet Search (CPS) program with spectral types ranging from about F5V to M4V for main-sequence stars and from G0IV to about K5IV for subgiants. The large data set of more than 44000 spectra allows us to identify an empirical baseline floor for chromospheric activity as a function of color and height above the main sequence. We define {Delta}S as an excess in emission in the CaII H and K lines above the baseline activity floor and define radial velocity jitter as a function of {Delta}S and B-V for main-sequence and subgiant stars. Although the jitter for any individual star can always exceed the baseline level, we find that K dwarfs have the lowest level of jitter. The lack of correlation between observed jitter and chromospheric activity in K dwarfs suggests that the observed jitter is dominated by instrumental or analysis errors and not astrophysical noise sources. Thus, given the long-term precision for the CPS program, radial velocities are not correlated with astrophysical noise for chromospherically quiet K dwarf stars, making these stars particularly well suited for the highest precision Doppler surveys. Chromospherically quiet F and G dwarfs and subgiants exhibit higher baseline levels of astrophysical jitter than K dwarfs. Despite the fact that the rms in Doppler velocities is correlated with the mean chromospheric activity, it is rare to see one-to-one correlations between the individual time series activity and Doppler measurements, diminishing the prospects for correcting activity-induced velocity variations in F and G dwarfs. 2010ApJ...725..875I https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/725/875 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991) J/A+A/520/A79 : FGK stars chromospheric activity (Martinez-Arnaiz+, 2010) J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008) J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007) J/A+A/469/309 : Chromospheric activity in late-type stars (Cincunegui+, 2007) J/AJ/123/3356 : Palomar/MSU nearby star spectroscopic survey (Gizis+, 2002) J/A+AS/142/275 : Stellar-activity of late-type stars (Strassmeier+ 2000) J/A+AS/146/103 : CaII H+K to CaII IRT echelle spectra (Montes+, 2000) J/AJ/111/439 : Chromospheric emission in late-type stars. (Henry+ 1996) http://www.exoplanets.org/cps.html : California Planet Survey home page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/725/875 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/725/875 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/725/875 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/725/875 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/725/875 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/725/875 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/725/875/table1 (S-values and derived quantities) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/725/875/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/725/875/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/725/875/table1? GET text/xml+votable 180.0 50000 true 9.7460153 30.6162186 0.005555555555555556 6/0 31 48 49 60 62 75 78 86 100 118 126 131 137 157 174 181 188 197 220 237 240 248 257 259 260 276 292 309 311 322 326 336 338 341 342 348 350 356 373 377 400 414 418 431 464 474 475 508 521 524 546 548 558 576 598 601 649 679 684 691 701 706 712 713 716 719 742 748 753 758 766 784 811 814 815 819 824 841 861 871 892 934 944 957 987 993 1005 1024 1026 1028 1030 1032 1033 1042 1043 1056 1058 1075 1084 1098 1100 1136 1164 1165 1171 1184 1186 1198 1201 1209 1237 1258 1288 1296 1318 1330 1339 1341 1344 1353 1354 1355 1362 1368 1370 1415 1418 1433 1447 1492 1505 1508 1530 1534 1552 1556 1576 1577 1597 1603 1642 1657 1673 1682 1736 1790 1805 1808 1817 1827 1834 1865 1873 1875 1907 1914 1938 1940 1956 1968 1975 1978 1997 2068 2072 2075 2110 2111 2133 2140 2144 2153 2167 2205 2222 2231 2240 2247 2254 2268 2273 2274 2279 2299 2366 2370 2371 2374 2381 2416 2418 2456 2463 2472 2489 2490 2491 2497 2512 2515 2565 2568 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Rotational period d time.period int nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Star name (G1) meta.id;meta.main char primary HIP ? Hipparcos identification (NNNNN) meta.id int nullable B-V Hipparcos catalog (B-V) color index mag phot.color;em.opt.B;em.opt.V float nullable SHK Median S_HK_ value (G2) phot.flux;arith.ratio float nullable Act Variations of the Activity meta.ref.url char Jitter [0/80.14] Radial velocity jitter (1) m/s stat.error float nullable logRHK ? Log of R'_HK_ value (G3) phot.flux;arith.ratio float nullable dMag ? Height above the main sequence ({delta}M_V_) mag phot.mag;arith.diff float nullable Age [0/8.44]? Age (in Gyr) Gyr time.age float nullable Obs [K/L] Observatory code: (K)eck or (L)ick meta.code;instr.obsty char S Link to S-values (table 2) meta.ref.url char _RA Positions from SIMBAD database (right ascension part) deg pos.eq.ra;meta.main nullable _DE Positions from SIMBAD database (declination part) deg pos.eq.dec;meta.main nullable
J/ApJ/725/875/table2 S-values and Julian Date Name Star name (G1) meta.id;meta.main char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int HIP ? Hipparcos identification (NNNNNA) meta.id int nullable JD Julian Date of observation (JD-2440000) d time.epoch double indexed SHK ? S_HK_ value (G2) phot.flux;arith.ratio float nullable logRHK ? Log of R'_HK_ value (G3) phot.flux;arith.ratio float nullable SNR Signal-to-noise ratio stat.snr int Obs [K/L] Observatory code: (K)eck or (L)ick meta.code;instr.obsty char