J/ApJ/517/264ivo://CDS.VizieR/J/ApJ/517/264doi:10.26093/cds/vizier.15170264CDSArce H.G.Goodman A.A.2000-03-16T09:07:12Z2000-03-16T10:06:26ZCDS support team

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

cds-question@unistra.frextinctioninterstellar-mediumphotometryWe present a study of the detailed distribution of extinction in a region of the Taurus dark cloud complex. Our study uses new BVR images of the region, spectral classification data for 95 stars, and IRAS Sky Survey Atlas (ISSA) 60 and 100 {mu}m images. We study the extinction of the region in four different ways, and we present the first intercomparison of all these methods, which are as follows: (1) using the color excess of background stars for which spectral types are known, (2) using the ISSA 60 and 100 {mu}m images, (3) using star counts, and (4) using an optical (V and R) version of the average color excess method used by Lada et al. We find that all four methods give generally similar results - with important exceptions. As expected, all the methods show an increase in extinction due to dense dusty regions (i.e., dark clouds and IRAS cores) and a general increase in extinction with increasing declination, due to a larger content of dust in the northern regions of the Taurus dark cloud complex. Some of the discrepancies between the methods are caused by assuming a constant dust temperature for each line of sight in the ISSA extinction maps and not correcting for unexpected changes in the background stellar population (i.e., the presence of a cluster or Galactic gradients in the stellar density and average V-R color).1999ApJ...517..264Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/517/264CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/101/485 : Multisite UBVRI photometry in Tau-Aur cloud (Bouvier+ 1993)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/517/264https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/517/264http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/517/264https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/517/264https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/517/264http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/517/264GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/517/264/table1 (Photometric and spectroscopic data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/517/264/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/517/264/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/517/264/table1?GETtext/xml+votable180.050000true65.6637522.4688890.0055555555555555566/1035 1057 1060 1062 1063 1069 1080 1082 1083 1169https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/517/264?format=asciiOpticaldefaultJ/ApJ/517/264/table1Photometric and spectroscopic dataB-V(B-V) colormagfloatSpTypeSpectral typechare_VmagUncertainty in VmagmagfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameObject namecharRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)VmagV band magnitudemagfloate_B-VUncertainty in B-VmagfloatE(B-V)E(B-V) reddening valuemagfloatAvExtinction in the V bandmagfloate_AvUncertainty in AvmagfloatDistDistancepcinte_DistUncertainty in Distpcint