J/ApJ/634/451ivo://CDS.VizieR/J/ApJ/634/451doi:10.26093/cds/vizier.16340451CDSMegier A.Strobel A.Bondar A.Musaev F.A.Han I.Krelowski J.,Galazutdinov G.A.2020-11-26T08:58:06Z2020-08-20T17:47:59ZCDS support team

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

cds-question@unistra.frinterstellar-mediumline-intensitiesstellar-distanceearly-type-starsWe show that the equivalent widths of the well-known interstellar CaII H and K lines can be used to determine the distances to OB stars in our Galaxy. The equivalent widths, measured in the spectra of 147 early-type stars, are strongly related to the Hipparcos parallaxes of those objects. The lines fitted to the parallax-equivalent width data are given by the formulae {pi}=1/[2.78EW(K)+95] and {pi}=1/[4.58EW(H)+102], where {pi} is in arcseconds and EW is in milliangstroms.2005ApJ...634..451Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/634/451CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/634/451https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/634/451http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/634/451https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/634/451https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/634/451http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/634/451GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/634/451/table1 (Target Data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/634/451/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/634/451/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/634/451/table1?GETtext/xml+votable180.050000true8.249963362.93178250.0055555555555555566/1040 1060 1196 1198 1203 1293 1323 1539 1549 1550 1554 1555 1558 1633 1748 1929 2884 3030 3060 3137 3251 3258 3305 3430 3491 3606 9478 9680 12972 12988 13255 13268 13557 13733 14008 14015 14167 14286 14368 14431 14459 14484 14636 14645 14646 14690 14691 14712 14793 14824 15375 15392 15478 15486 15573 15577 15580 15625 15631 15656 15672 15677 15683 15745 15747 21401 21439 21879 22249 22253 22854 22862 22911 23637 23769 23979 24338 24340 24370 27402 27498 28809 29513 29621 29876 29893 30722 30818 31063 31121 31759 32174 32513 37145 37364 37716 37865 37903 37905 38016 38452 39187 39397 41520 41692 41747 41812 42113 42116 42183 42190 42221 42236 42237 42383 42395 42408 42410 42416 42470 42477 42483 42618 42959 42977 43011 43018 43024 43062 43088 43383 43521 43531 44306 44312 44316 44360 44366 44378 44385 44386 44389https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/634/451?format=asciidefaultJ/ApJ/634/451/table1Target DatarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD numbermeta.idintSpTypeMK spectral type and luminosity classsrc.spTypecharE(B-V)Reddeningmagphot.color.excessfloatplxParallaxarcsecpos.parallax.trigfloate_plxError in plxarcsecstat.error;pos.parallaxfloatEW(CaIIK)? CaII K line equivalent width0.1pmspect.line.eqWidthfloatnullableu_EW(CaIIK)[:!] Uncertainty flag on EW(CaIIK)meta.code.errorchare_EW(CaIIK)? Error in EW(CaIIK)0.1pmstat.errorfloatnullableEW(CaIIH)? CaII H line equivalent width0.1pmspect.line.eqWidthfloatnullablee_EW(CaIIH)? Error in EW(CaIIH)0.1pmstat.errorfloatnullableEW(KI)? KI line equivalent width0.1pmspect.line.eqWidthfloatnullablee_EW(KI)? Error in EW(KI)0.1pmstat.errorfloatnullableEW(CH)? CH line equivalent width0.1pmspect.line.eqWidthfloatnullablee_EW(CH)? Error in EW(CH)0.1pmstat.errorfloatnullableSimbadSimbad 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