J/ApJ/408/305ivo://CDS.VizieR/J/ApJ/408/305doi:10.26093/cds/vizier.14080305CDSLANDSMAN W.B.SIMON T.1997-12-09T19:48:21Z1997-12-09T20:48:18ZCDS support team

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

cds-question@unistra.frThe data file gives the measured Lyman alpha flux or upper limits for 275 stars as derived from IUE spectra. The file is a subset of Table 1 of Landsman and Simon in that when a star had multiple measurements, only the best measurement is included in this table. The spectral types, V and B-V magnitudes in the table are culled from various sources as described in the paper. Most of the measurements are derived from low-dispersion spectra, and those derived from high-dispersion spectra are flagged. Each measurement was assigned a data quality code according to the signal to noise after removal of the diffuse Lyman alpha background emission. -1 - upper limit 1 - good quality 2 - fair quality 3 - poor quality 4 - contains saturated pixels The final column gives the ratio of the Ly alpha flux to the total bolometric flux of the star, determined as described in the paper. A roundoff was applied to the fluxes listed here to give the fluxes listed in Table 1 of Landsman and Simon.1993ApJ...408..305Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/408/305CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/408/305https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/408/305http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/408/305https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/408/305https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/408/305http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/408/305GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/408/305/table1Lyman-alpha fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Namemeta.id;meta.maincharHD[]? HD numbermeta.idintSpSpectral typesrc.spTypecharVV magnitudemagphot.mag;em.opt.VfloatB_VB-V colormagphot.color;em.opt.B;em.opt.VfloatImageIUE SWP image numbermeta.idintExpTimIUE Exposure Timestime.duration;obs.exposureintn_Flux[H ] 'H' if high-dispersion spectrummeta.notecharl_Fluxlimit flag on Lyman alpha fluxmeta.code.errorcharFluxLyman alpha flux (in 10-14 erg/cm2/s/A)1e-16W.m**-2.nm**-1phot.fluxintq_Flux*[-1/4] Measurement quality (1)meta.code.qualintl_NFluxlimit flag on normalized Lyman alpha fluxmeta.code.errorcharNFluxNormalized Lyman alpha flux (in 10-7 x normalization)phot.flux;arith.ratiofloat