J/AJ/124/2164ivo://CDS.VizieR/J/AJ/124/2164doi:10.26093/cds/vizier.51242164CDSAndersson B.-G.Idzi R.Uomoto A.Wannier P.G.Chen B.Jorgensen A.M.2023-04-06T16:50:51Z2003-06-22T16:46:26ZCDS support team

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

cds-question@unistra.frmolecular-cloudsvisible-astronomysloan-photometryWide-band photometryWe present a spectroscopic and photometric survey of a sample of field stars in the region of the molecular cloud L1457. High-quality coude feed spectra, together with five-band photometry in the Sloan Digital Sky Survey system and near-infrared archival data from the Two Micron All Sky Survey, are used to derive color excesses and distances for the stars. Based on these data, a new distance estimate of 360+/-30pc is derived for the cloud, supporting recent results by K.L. Luhman, 2001ApJ...560..287L. The data further indicate that the north-south velocity gradient seen in the millimeter-wave CO data is mirrored in a distance gradient, with the northern part of the cloud being closer to us. A second, less opaque, layer of extinction is detected at ~80pc. This distance is consistent with the earlier distance estimates to the cloud, based on Na I absorption. We identify this layer with the wall of the hot Local Bubble. Hence, the dense cloud is not, as previously thought, associated with the Local Bubble.2002AJ....124.2164Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/124/2164CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/124/2164https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/124/2164http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/124/2164https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/124/2164https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/124/2164http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/124/2164GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/124/2164/table2 (Observational Data for Stars in the L1457 Field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/2164/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/2164/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/2164/table2?GETtext/xml+votable180.050000true40.9118.53550.005555555555555556Cone search capability for table J/AJ/124/2164/table4 (Rejected stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/2164/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/2164/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/2164/table4?GETtext/xml+votable180.050000true41.17791719.3095560.0055555555555555565/149 192 6/251-252 254-255 426 594-595 600-601 605 776-7778.650015785639275e-20 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/124/2164?format=asciiOpticaldefaultJ/AJ/124/2164/table2Observational Data for Stars in the L1457 FieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGSCGuide Star Catalog identification numbermeta.id;meta.maincharprimaryf_GSC[T] Flag GSC (1)meta.code.errorcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainu'mag? The SDSS u'-band magnitude (2)magphot.mag;em.opt.Ufloatnullableg'mag? The SDSS g'-band magnitude (2)magphot.mag;em.opt.Bfloatnullabler'mag? The SDSS r'-band magnitude (2)magphot.mag;em.opt.Rfloatnullablei'mag? The SDSS i'-band magnitude (2)magphot.mag;em.opt.Ifloatnullablez'mag? The SDSS z'-band magnitude (2)magphot.mag;em.opt.Ifloatnullableu_z'mag[:] Uncertainty flag on z'mag (3)meta.code.errorcharKmag? K-band magnitude, transformed from the 2MASS K_s_ magnitudemagphot.mag;em.IR.Kchare_Kmag? Error in Kmagmagstat.errorfloatnullablef_Kmag[B] Indicates Kmag from Bhatt et al., 1994A&A...289..946Bmeta.code.errorcharJ/AJ/124/2164/table3Derived Data for Stars in the L1457 FieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGSCGuide Star Catalog identification numbermeta.id;meta.maincharBmagThe B-band magnitudemagphot.mag;em.opt.Bfloate_BmagError in Bmagmagstat.errorfloatVmagThe V-band magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.errorfloatSpTypeMK Spectral classificationsrc.spTypecharn_SpTypeRange of uncertainty for SpType (1)meta.notechar(B-V)0The intrinsic (B-V)_0_ colormagphot.color;em.opt.B;em.opt.Vfloate_(B-V)0Error in (B-V)0magstat.errorfloatVMAGThe absolute V-band magnitudemagphys.magAbs;em.optfloate_VMAGError in VMAGmagstat.errorfloatE(B-V)The E(B-V) color excessmagphot.color.excessfloate_E(B-V)Error in E(B-V)magstat.errorfloatR(V)? The total-to-selective extinction (2)magphys.absorptionfloatnullablee_R(V)? Error in R(V)magstat.errorfloatnullableJ/AJ/124/2164/table4Rejected starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGSCGuide Star Catalog identification numbermeta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloatn_Vmag[cd] Note on Vmag (1)meta.notecharSpTypeMK Spectral typesrc.spTypecharCodeRejection code (2)meta.notechar