J/MNRAS/355/1272ivo://CDS.VizieR/J/MNRAS/355/1272doi:10.26093/cds/vizier.73551272CDSMaheswar G.Manoj P.Bhatt H.C.2024-06-30T20:16:44Z2006-02-09T06:59:23ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-photometryvisible-astronomyphotometryA method for determining distances to dark clouds and Bok globules based on broad-band optical and near-infrared photometry is presented. In this method, intrinsic colour indices of stars projected towards the direction of a cloud are computed by dereddening the observed colour indices using various trial values of extinction A_V_ and a standard extinction law. The computed intrinsic colour indices for a star are then compared with the intrinsic colour indices of normal main-sequence stars and a spectral type is assigned to the star for which the computed colour indices best match the standard intrinsic colour indices. Distances (d) to the stars are determined using the A_V_ and absolute magnitudes (M_V_) corresponding to the spectral types thus obtained. A plot of A_V_ against d undergoes a sharp rise at a distance corresponding to the distance to the cloud. Using this method, we have determined a distance of 550pc to the cometary globule CG 12.2004MNRAS.355.1272Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/355/1272CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/355/1272https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/355/1272http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/355/1272https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/355/1272https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/355/1272http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/355/1272GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/355/1272/photo (Photometric results around around CG 12)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/355/1272/photo?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/355/1272/photo?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/355/1272/photo?GETtext/xml+votable180.050000true209.335-39.9250.0055555555555555566/43441 434448.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/355/1272?format=asciiOpticalInfrareddefaultJ/MNRAS/355/1272/photoPhotometric results around around CG 12SpTypeSpectral typecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegSimbad column added by the CDSnullableSeqStar number, in the region (1)intRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagfloate_Vmagrms uncertainty on VmagmagfloatRmagR magnitudemagfloate_Rmagrms uncertainty on RmagmagfloatImagI magnitudemagfloate_Imagrms uncertainty on ImagmagfloatJmag2MASS J magnitudemagfloate_Jmagrms uncertainty on JmagmagfloatHmag2MASS H magnitudemagfloate_Hmagrms uncertainty on HmagmagfloatKsmag2MASS Ks magnitudemagfloate_Ksmagrms uncertainty on KsmagmagfloatAVAbsorption in V bandmagfloatChi2Chi2 value related to AV and VMAG estimationsfloatVMAGEstimated absolute V magnitudemagfloatDistEstimated distancepcint