II/43ivo://CDS.VizieR/II/43CDSHenry R.C. Hesser J.E.2017-10-03T05:12:42Z2000-01-01T22:01:07ZCDS support team

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

cds-question@unistra.frvisible-astronomynarrow-band-photometrya-starsThe photoelectric measurements of the strength of the Calcium K-line has been extended by 223 stars of predominantly southern or equatorial declinations which are well distributed in right ascension. This has expanded the existent list to 369 field stars for which a k-index is available, including many more Am stars. All available k-index data for field stars are presented here. Introduction: The present work represents a continuation of that described previously (Henry 1968ApJ...152L..87H, 1969ApJS...18...47H = II/42, [hereinafter referenced as Paper I]), in which the K-line of calcium at 3933{AA} is measured photoelectrically in A-type stars with a narrow-band spectrometer. The result for each star is a K-line strength index, called k, the value of which appears to depend predominantly only on the temperature of the star and the abundance of calcium in its atmosphere. The temperature dependence is well known; the abundance dependence appears as a correlation between the residual dK in K (after allowance for the temperature effect) and the difference from normal of the general metallicity index [m1] of Stromgren. Alternatively, it was shown in Paper I that the calcium abundance is probably the effective factor in producing the scatter in the relation between k and b-y by a process of elimination of other parameters (luminosity, etc.) that were found not to affect appreciably the value of k. The value of k is, however, affected by a third parameter, namely, whether the star is an Am star or not. Many of the stars of Paper I were reobserved in order to tie in the new measurements with the old ones. An emphasis was laid on observing more Am stars, and on observing some stars that are of somewhat earlier spectral types than the earliest ones observed previously. Simultaneously with the field-star measurements described here, extensive data were acquired for the A stars in five open clusters (Hyades, Pleiades, IC 2391, IC 2602, and NGC 6475) and one association (Orion), as described in Paper III (Hesser & Henry 1971ApJS...23..453H). The observations were made with the same instrument that was used to obtain the data for Paper I, and a description of the instrument may be found in that paper.1971ApJS...23..421Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/43CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/42 : K-Line photometry of A stars (Henry, 1969)II/44 : K-line photometry of stars in open clusters (Hesser+ 1971)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/43https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/43https://vizier.iucaa.in/viz-bin/votable?-source=II/43http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/43/data (Data from table 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/II/43/data?https://vizier.iucaa.in/viz-bin/conesearch/II/43/data?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/43/data?GETtext/xml+votable180.050000true1.9454147-22.50856030.0055555555555555566/183 350 603 618 630 689 714 4251 4297 4890 5137 5267 5509 5554 5631 5726 5873 6082 7221 7239 7413 8381 8462 8510 8534 8571 8597 8687 8767 8803 9048 9057 9125 9504 9521 9642 9716 9857 10000 10096 10568 10614 10671 10695 10783 10835 10965 11057 11085 11099 11109 11120 11193 11202 11344 11356 11652 11720 11817 11851 12057 12396 12847 12909 13048 14405 14458 14472 14522 14567 14711 14763 14777 14851 14852 14881 14899 14906 15167 15179 15257 15261 15265 16186 16629 16686 16982 17322 17421 17573 17762 17783 17820 18210 18293 18373 18423 18431 18737 18766 18942 19329 19825 19941 20125 20184 20322 20609 20702 20940 21036 21112 21196 21397 22114 22581 22759 22773 22787 22822 23403 23426 23518 23864 25015 25016 25096 25138 25272 25436 25789 25973 26024 26057 26254 26364 26381 26406 26736 26886 27029 27130 27215 27506 27541 27663 27678 27735 27756 27863 27884 27887 27890 27909 27993 28094 28128 28137 28142 28208 28316 28352 28481 28484 28737 28838 28872 28912 28944 28987 29054 29207 29208 29212 29311 29428 29572 29619 29630 29660 30083 30325 30354 30505 30580 30593 30655 30712 30872 30914 31281 31325 31448 31511 31561 31716 31776 31849 31929 31961 31977 32061 32095 32174 32288 32297 32472 32590 32610 33351 33361 33539 33547 33716 33722 33935 34156 34347 34456 34724 34873 34908 35104 35149 35226 35293 35327 35352 35391 35447 35474 35603 35676 35723 35836 35999 36047 36081 36082 36096 36104 36119 36145 36177 36184 36298 36341 36351 36514 36534 36676 36711 36770 36804 36850 36851 37164 37253 37270 37297 37660 37732 37779 37794 37816 37900 38015 38018 38021 38024 38074 38087 38101 38223 38296 38374 38395 38489 38492 38667 38722 38730 38734 38929 39052 39085 39137 39373 39394 39525 40121 40345 40593 40659 40783 40826 40882 41320 41633 41689 41916 41917 41939 41947 41973 41983 42072 42268 42270 42333 42356 42366 42568 42633 42670 42672 42673 42836 43004 43018 43127 43165 43293 43294 43414 43540 43601 43676 44074 44227 44258 44441 44451 44494 44651 44785 44833 44903 45032 45589 45643 45819 46091 46294 46367 46768 46982 47112 47216 47539 47593 47595 47788 47796 47807 48088 48326 48417 48587 48589 48591 48613 48910 490473.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/II/43?format=asciiOpticaldefaultII/43/dataData from table 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHRHR Number (Bright Star Catalog, Cat. V/50)meta.id;meta.mainintVmagVisual Magnitude from HR (V/50) or Blanco (II/4)magphot.mag;em.opt.VfloatB-V? (B-V)-Color from BSC.magphot.color;em.opt.B;em.opt.Vfloatnullableknew? New k-Index in Magnitudemagphot.colorfloatnullablee_knew? RMS-Error of knew (1)magstat.errorfloatnullablekFinal Value of k-Index (2)magphot.colorfloate_k? RMS-Error of final k-Indexmagstat.errorfloatnullabledk? Deviation of k-Index (3)magstat.stdevfloatnullableSg[LIE] Stroemgren's group (4)src.class.colorcharb-y? (b-y)-Color from Stromgren-Perry Catalogue (5)magphot.color;em.opt.B;em.opt.VfloatnullableE(b-y)? Color excess (5)magphot.color.excessfloatnullablebeta? Stromegren {beta}-index (6)magphot.color;em.opt.B;em.line.Hbetafloatnullablem1? Stromgren [m_1_] reddening-insensitive indexmagphot.colorfloatnullabledm1? Deviation {delta}[m_1_] of [m_1_] index (7)magstat.stdev;spect.indexfloatnullablec1? Stromgren [c_1_] reddening-insensitive indexmagphot.colorfloatnullabledV? Magnitudes above the main-sequence (8)magphot.mag;arith.difffloatnullableu-b? (u-b)-Index of Stromgrenmagphot.color;em.opt.U;em.opt.Bfloatnullablea? a-index or dm1 (9)magphot.colorfloatnullabler? r Luminosity-index of Stromgren (10)magphot.colorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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