J/MNRAS/513/4899ivo://CDS.VizieR/J/MNRAS/513/4899doi:10.26093/cds/vizier.75134899CDSSingh S.Pandey J.C.Hoang T.2025-08-11T20:18:56Z2025-02-27T12:35:11ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersinterstellar-mediumvisible-astronomyphotometrypolarimetrystellar-associationsastrometryWe have investigated the grain alignment and dust properties towards the direction of the cluster NGC 2345 using the multiband optical polarimetric observations. For the majority of the stars, the observed polarization is found to be due to the interstellar medium with average values of maximum polarization and wavelength corresponding to it as 1.55 per cent and 0.58 {mu}m, respectively. This reveals a similar size distribution of dust grains to that in the general interstellar medium in the direction of NGC 2345. Alteration of dust properties near the distance of 1.2 kpc towards the direction of NGC 2345 has been noticed. The dust grains located beyond this distance are found to be aligned with the Galactic magnetic field, whereas a dispersion in the orientation of the dust grains lying in the foreground of this distance is found. Polarizing efficiency of grains in this direction is found to be close to the average efficiency for our Galaxy. The decreased grain size along with the increased polarizing efficiency towards the core region of the cluster indicates the local radiation field is higher within the cluster, which is responsible for the increased alignment efficiency of small grains. The wavelength of maximum polarization (associated with the average size of aligned grains) is also found to increase with extinction and reduces with the increase in polarizing efficiency, which can be explained by the radiative torque alignment mechanism.2022MNRAS.513.4899Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/513/4899CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)J/AJ/161/149 : Vilnius photometry in IC 59 and IC 63 (Soam+, 2021)J/AJ/160/256 : Polarization of 125 stars in NGC 1817 open clusterJ/A+A/631/A124 : NGC 2345 Stroemgren photometry (Alonso-Santiago+, 2019)J/A+A/558/A53 : Milky Way global survey of star clusters. II.I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/513/4899https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/513/4899http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/513/4899https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/513/4899https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/513/4899http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/513/4899GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/513/4899/table1 (The degree of polarization P and polarization position angle ({Theta}) in four bands B/V/R/I for observed stars in the cluster NGC 2345 and a field region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/513/4899/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/513/4899/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/513/4899/table1?GETtext/xml+votable180.050000true107.1331039-13.16993560.0055555555555555566/21632-21633 21635https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/513/4899?format=asciiOpticaldefaultJ/MNRAS/513/4899/table1The degree of polarization P and polarization position angle ({Theta}) in four bands B/V/R/I for observed stars in the cluster NGC 2345 and a field regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion Cluster or Field regionmeta.notecharIDIdentifier number (ID)meta.idintn_IDID marked with asterisk symbol are members of the cluster NGC 2345meta.notecharGaiaDR2Gaia DR2 source identifier (Gaia)meta.id;meta.mainOffsetOffset position between ARIES and Gaia positions (Offset)arcsecpos.angDistancefloatPB? Degree of polarization in the B band (P_B_)%phys.polarization;em.opt.Bfloatnullablee_PB? Mean error of P_B_ (errorP_B_)%stat.errorfloatnullablePAB? Position angle of polarization in the B band ({Theta}_B_)degpos.posAng;phys.polarization;em.opt.Bfloatnullablee_PAB? Mean error of PAB (error{Theta}_B_)degstat.errorfloatnullablePV? Degree of polarization in the V band (P_V_)%phys.polarization;em.opt.Vfloatnullablee_PV? Mean error of P_V_ (errorP_V_)%stat.errorfloatnullablePAV? Position angle of polarization in the V band ({Theta}_V_)degpos.posAng;phys.polarization;em.opt.Vfloatnullablee_PAV? Mean error of PAV ( (error{Theta}_V_)degstat.errorfloatnullablePR? Degree of polarization in the R band (P_R_)%phys.polarization;em.opt.Rfloatnullablee_PR? Mean error of P_R_ (errorP_R_)%stat.errorfloatnullablePAR? Position angle of polarization in the R band ({Theta}_R_)degpos.posAng;phys.polarization;em.opt.Rfloatnullablee_PAR? Mean error of PAR (error{Theta}_R_)degstat.errorfloatnullablePI? Degree of polarization in the I band (P_I_)%phys.polarization;em.opt.Ifloatnullablee_PI? Mean error of P_I_ (errorP_I_)%stat.errorfloatnullablePAI? Position angle of polarization in the I band ({Theta}_I_)degpos.posAng;phys.polarization;em.opt.Ifloatnullablee_PAI? Mean error of PAI (error{Theta}_I_)degstat.errorfloatnullable_RAPosition from Gaia DR2 Gaia Collaboration 2018A&A...616A...1G; Cat. I/345 (right ascension part)degpos.eq.ra;meta.main_DEPosition from Gaia DR2 Gaia Collaboration 2018A&A...616A...1G; Cat. I/345 (declination part)degpos.eq.dec;meta.main