III/159Aivo://CDS.VizieR/III/159ACDSDuncan D.K.Vaughan A.H.Wilson O.C.Preston G.W.Frazer J.,Lanning H.H.Misch A.Mueller J.Soyumer D.Woodard L.Baliunas S.L.,Noyes R.W.Hartmann L.W.Porter A.Zwaan K.Middelkoop F.,Rutter R.Mihalas D.2005-11-16T20:18:22Z2005-11-16T21:16:29ZCDS support team

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

cds-question@unistra.frvisible-astronomynarrow-band-photometrySummaries are presented of the photoelectric measurements of stellar CaII H and K line intensity made at Mount Wilson Observatory during the years 1966-1983. These results are derived from 65,263 individual observations of 1296 stars. For each star, for each observing season, the maximum, minimum, mean, and variation of the instrumental H and K index "S" are given, as well as a measurement of the accuracy of observation. A total of 3110 seasonal summaries are reported. These observations were obtained with two instruments, HKP-1 and HKP-2. The HKP-2 instrument is a four-channel chopping spectrometer which records counts in 1.09{AA} FWHM triangular bandpasses centered in the H and K lines as well as in two 20{AA} reference bandpasses centered on 3901.067 and 4001.067{AA}. The stellar activity is expressed by the index S defined as S = {alpha} (Nh+Nk)/(Nr+Nv) where Nh and Nk are the counts (corrected from background) in the H and K lines, Nr and Nv those in the reference continuum bandpasses, and {alpha} is a constant of proportionality used to correct for night-to-night instrumental variations. Higher values of S generally correspond to higher levels of chromospehric activities. Factors which effect the ability to detect stellar activity variations and accurately measure their amplitudes such as the accuracy of the H and K measurements and scattered light contamination are discussed. Relations are given which facilitate intercomparison of "S" values with residual intensities from ordinary spectrophotometry, and for converting measurements to absolute fluxes.1991ApJS...76..383Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/III/159ACatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/76 : Chromospherically Active Binaries (Strassmeier+ 1993)J/A+A/312/221 : Excess CaII H+K emission in active binaries (Montes+, 1996)J/MNRAS/349/1069 : Chromospherically active binaries (Karatas+, 2004)J/A+A/325/1115 : Near-simultaneous ROSAT and Mt Wilson data (Piters+ 1997)J/A+A/423/677 : O-abundances in chromospherically active stars (Morel+ 2004)J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)J/MNRAS/298/332 : Chromospheric activity-age relation (Rocha-Pinto+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=III/159Ahttps://vizier.iucaa.in/viz-bin/VizieR-2?-source=III/159Ahttp://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=III/159Ahttps://vizier.cds.unistra.fr/viz-bin/votable?-source=III/159Ahttps://vizier.iucaa.in/viz-bin/votable?-source=III/159Ahttp://vizieridia.saao.ac.za/viz-bin/votable?-source=III/159AGETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table III/159A/catalog (Observational Data)https://vizier.cds.unistra.fr/viz-bin/conesearch/III/159A/catalog?https://vizier.iucaa.in/viz-bin/conesearch/III/159A/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/III/159A/catalog?GETtext/xml+votable180.050000true144.205257.91210.0055555555555555565/84 5883 7120 6/4 15 75 79 100 128 129 137 140 176 181 237 254 259 290 309 320 322 325 327 333 340 341 342 348 349 351 359 373 375 377 400 405 411 428 456 461 462 463 472 474 475 483 485 496 497 587 647 670 679 684 727 737 744 753 770 811 824 846 915 924 930 944 993 1005 1015 1024 1032 1033 1042 1058 1060 1075 1082 1098 1153 1209 1216 1247 1341 1448 1452 1505 1535 1547 1556 1603 1618 1642 1672 1696 1728 1739 1749 1765 1770 1791 1808 1822 1834 1875 1896 1938 1969 2017 2025 2055 2089 2092 2127 2133 2150 2202 2213 2219 2282 2317 2371 2377 2420 2433 2436 2440 2460 2472 2476 2490 2499 2505 2549 2560 2572 2598 2619 2622 2623 2650 2678 2691 2716 2724 2737 2747 2784 2823 2828 2837 2896 2921 2923 2927 2940 2958 2970 2973 3005 3006 3015 3020 3026 3031 3032 3036 3071 3077 3083 3088 3102 3115 3118 3134 3146 3164 3168 3176 3208 3229 3250 3256 3268 3335 3372 3390 3507 3509 3600 3616 3619 3638 3639 3691 3697 3714 3715 3719 3751 3777 3780 3791 3894 3915 3932 3979 4017 4029 4051 4059 4104 4118 4227 4278 4438 4468 4591 4644 4648 4690 4698 4709 4720 4772 4805 4808 4820 4839 4854 4866 5013 5019 5035 5061 5074 5088 5102 5154 5160 5304 5343 5377 5413 5420 5476 5498 5514 5522 5534 5587 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49101 49123https://cdsarc.cds.unistra.fr/viz-bin/moc/III/159A?format=asciiOpticaldefaultIII/159A/catalogObservational DataNobsNumber of Observations of SintWminMinimum weight (2)doubleSmaxMaximum S valuefloatSmeanMean S value (1)floatASCC? [1,2603318] ASCC-2.5 number (Cat. I/280)intnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar Name or Number (default = HD or DM)charSminMinimum S valuefloate_SmeanStandard deviation on SmeanfloatsdSStandard deviation as a percentage%floatWmeanMean weight (2)doubleDate1First Date the star was observednullableDate2Last Date the star was observednullableSNameName recognized by SimbadcharRAJ2000? Right Ascension (J2000)degpos.eq.ra;meta.mainnullableDEJ2000? Declination (J2000)degpos.eq.dec;meta.mainnullablerPos[AUM] Origin of position: A=ASCC-2.5 (I/280) U=UCAC2 (I/289), M=2MASS (II/246)charBmag? B mag in Johnson system (from ASCC-2.5)magfloatnullableVmag? V mag in Johnson system (from ASCC-2.5)magfloatnullableHIP? Hipparcos number (Cat. I/239)intnullable