J/A+A/556/A65ivo://CDS.VizieR/J/A+A/556/A65doi:10.26093/cds/vizier.35560065CDSEswaraiah C.Maheswar G.Pandey A.K.Jose J.Ramaprakash A.N.,Bhatt H.C.2017-06-29T08:55:59Z2013-08-05T10:04:29ZCDS support team

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

cds-question@unistra.frmolecular-cloudsbok-globulesinterstellar-mediumpolarimetryinfrared-photometryvisible-astronomybroad-band-photometryWe wish to map the magnetic field geometry and to study the dust properties of the starless cloud, L1570, using multiwavelength optical polarimetry and photometry of the stars projected on the cloud. We made R-band imaging polarimetry of the stars projected on a cloud, L1570, to trace the magnetic field orientation. We also made multi-wavelength polarimetric and photometric observations to constrain the properties of dust in L1570. We estimated a distance of 394+/-70pc to the cloud using 2MASS JHKs colours. Using the values of the Serkowskiparameters namely {sigma}_1_, {overline}{epsilon}, {lambda}_max_ and the position of the stars on near infrared color-color diagram, we identified 13 stars that could possibly have intrinsic polarization and/or rotation in their polarization angles. One star, 2MASS J06075075+1934177, which is a B4Ve spectral type, show the presence of diffuse interstellar bands in the spectrum apart from showing H_{alpha} line in emission. There is an indication for the presence of slightly bigger dust grains towards L1570 on the basis of the dust grain size-indicators such as {lambda}_max_ and R_V_ values. The magnetic field lines are found to be parallel to the cloud structures seen in the 250um images (also in 8um and 12um shadow images) of L1570. Based on the magnetic field geometry, the cloud structure and the complex velocity structure, we believe that L1570 is in the process of formation due to the converging flow material mediated by the magnetic field lines. Structure function analysis showed that in the L1570 cloud region the large scale magnetic fields are stronger when compared with the turbulent component of magnetic fields. The estimated magnetic field strengths suggest that the L1570 cloud region is sub-critical and hence could be strongly supported by the magnetic field lines.2013A&A...556A..65Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/556/A65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/556/A65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/556/A65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/556/A65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/556/A65https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/556/A65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/556/A65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/556/A65/standard (List of standard stars of table1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A65/standard?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A65/standard?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A65/standard?GETtext/xml+votable180.050000true30.67537560.25736110.005555555555555556Cone search capability for table J/A+A/556/A65/table2 (Rc-band polarization data of 127 stars along with their 2MASS data and positions (JHKs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A65/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A65/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A65/table2?GETtext/xml+votable180.050000true91.6251919.376681940.005555555555555556Cone search capability for table J/A+A/556/A65/polser (Polarization and Serkowski fit parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A65/polser?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A65/polser?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A65/polser?GETtext/xml+votable180.050000true91.6792488919.535978060.005555555555555556Cone search capability for table J/A+A/556/A65/table6 (Photometric data of 144 stars with good signal/noise ratio (with BV(RI)c and 2MASS JHK-photometric errors 0.1 mag) along with their positions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A65/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A65/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A65/table6?GETtext/xml+votable180.050000true91.7502530619.4661850.0055555555555555566/3029 3283 3384 3609 3725 15486 239778.650015785639275e-20 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/556/A65?format=asciiOpticalInfrareddefaultJ/A+A/556/A65/standardList of standard stars of table1NameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Simbad Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000.0)pos.eq.dec;meta.mainBmagSimbad B band magnitudemagphot.mag;em.opt.BfloatVmagSimbad V band magnitudemagphot.mag;em.opt.VfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/556/A65/table1*Observed polarized standard stars from Schmidt et al. (1992AJ....104.1563S)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInst[AI] Instrument (A: AIMPOL, I: IFOSC)meta.notecharNameStar namemeta.id;meta.maincharn_Name[+] +: data from Schmidt et al., 1992AJ....104.1563Smeta.notecharDateObservation datetime.epoch;obsnullablePBPercentage of polarization in B-band%phys.polarizationfloate_PBrms uncertainty on PB%stat.errorfloatPAB[0/180] Polarization angle in B-banddegpos.posAng;phys.polarizationfloate_PABrms uncertainty on PABdegstat.errorfloatPV? Percentage of polarization in V-band%phys.polarizationfloatnullablee_PV? rms uncertainty on PV%stat.errorfloatnullablePAV[0/180]? Polarization angle in V-banddegpos.posAng;phys.polarizationfloatnullablee_PAV? rms uncertainty on PAVdegstat.errorfloatnullablePRc[0/180] Percentage of polarization in Rc-band%phys.polarizationfloate_PRcrms uncertainty on PRc%stat.errorfloatPARcPolarization angle in Rc-banddegpos.posAng;phys.polarizationfloate_PARcrms uncertainty on PARcdegstat.errorfloatPIc? Percentage of polarization in Ic-band%phys.polarizationfloatnullablee_PIc? rms uncertainty on PIc%stat.errorfloatnullablePAIc? Polarization angle in Ic-banddegpos.posAng;phys.polarizationfloatnullablee_PAIc? rms uncertainty on PAIcdegstat.errorfloatnullableJ/A+A/556/A65/table2Rc-band polarization data of 127 stars along with their 2MASS data and positions (JHKs)e_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatKsmag2MASS Ks magnitudemagphot.mag;em.IR.KfloatHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmagrms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPSimbad column added by the CDSmeta.ref.urlcharSeq[1/127] Star sequential numbermeta.recordintprimaryn_Seq[+] +: H{alpha} emission line sourcesmeta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainPRcPercentage of polarization in Rc-band%phys.polarizationfloate_PRcrms uncertainty on PRc%stat.errorfloatPARc[45/225] Polarization angle in Rc-band (G1)degpos.posAng;phys.polarizationinte_PARcrms uncertainty on PARcdegstat.errorintJmag2MASS J magnitudemagphot.mag;em.IR.JfloatJ/A+A/556/A65/polserPolarization and Serkowski fit parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/127] Star sequential numbermeta.recordintn_Seq[+] +: H{alpha} emission line sourcesmeta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainPmaxMaximum percentage of polarization (1)%phys.polarizationfloate_Pmaxrms uncertainty on Pmax (1)%stat.errorfloatlam.maxWavelength corresponding to Pmax (1)umem.wlfloate_lam.maxrms uncertainty on lam.max (1)umstat.errorfloatsigma1Unit weight error of the fit, {sigma}_1_ (2)stat.fit.paramfloatepsDispersion of the polarization angle normalized by the average of the polarization angle errors ({epsilon}{bar})stat.fit.paramfloatPB? Percentage of polarization in B-band (3)%phys.polarizationfloatnullablee_PB? rms uncertainty on PB (3)%stat.errorfloatnullablePVPercentage of polarization in V-band%phys.polarizationfloate_PVrms uncertainty on PV%stat.errorfloatPRcPercentage of polarization in Rc-band%phys.polarizationfloate_PRcrms uncertainty on PRc%stat.errorfloatPIcPercentage of polarization in Ic-band%phys.polarizationfloate_PIcrms uncertainty on PIc%stat.errorfloatPAB[45/225]? Polarization angle in B-band (3) (G1)degpos.posAng;phys.polarizationintnullablee_PAB? rms uncertainty on PAB (3)degstat.errorintnullablePAV[45/225] Polarization angle in V-band (G1)degpos.posAng;phys.polarizationinte_PAVrms uncertainty on PAVdegstat.errorintPARc[45/225] Polarization angle in Rc-band (G1)degpos.posAng;phys.polarizationinte_PARcrms uncertainty on PARcdegstat.errorintPAIc[45/225] Polarization angle in Ic-band (G1)degpos.posAng;phys.polarizationinte_PAIcrms uncertainty on PAIcdegstat.errorintJ/A+A/556/A65/table6Photometric data of 144 stars with good signal/noise ratio (with BV(RI)c and 2MASS JHK-photometric errors 0.1 mag) along with their positionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar sequential numbermeta.recordintn_Star[*] H{alpha} emission line sourcemeta.notecharSeq[1/127]? Star sequential number in Table 2meta.recordintnullablen_Seq[+] Unreddened M-type dwarf (from (V-I)/(B-V) colour-colour diagram)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.Bfloate_Bmagrms uncertainty on Bmagmagstat.error;phot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatRcmagRc magnitudemagphot.mag;em.opt.Rfloate_Rcmagrms uncertainty on Rmagmagstat.error;phot.mag;em.opt.RfloatIcmagIc magnitudemagphot.mag;em.opt.Ifloate_Icmagrms uncertainty on Imagmagstat.error;phot.mag;em.opt.IfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmagrms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatKsmag2MASS Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloat