J/AJ/160/256ivo://CDS.VizieR/J/AJ/160/256doi:10.26093/cds/vizier.51600256CDSSingh S.Pandey J.C.2021-07-05T09:03:46Z2021-03-04T07:07:45ZCDS support team

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

cds-question@unistra.fropen-star-clustersinterstellar-mediuminfrared-photometryvisible-astronomybroad-band-photometrypolarimetryMultiband linear polarimetric observations of 125 stars in the region of the cluster NGC1817 have been carried out intending to study properties of interstellar dust and grains in that direction. The polarization is found to be wavelength-dependent, being maximum in the V-band with an average value of 0.95%. The foreground interstellar dust grains appear to be the main source of linear polarization of starlight toward the direction of NGC1817. The average value of the position angle in the V-band of 119.2{deg} is found to be less than the direction of the Galactic parallel in the region, indicating that the dust grains in the direction are probably not yet relaxed. Spatial distribution of dust appears to be more diverse in the coronal region than the core region of the cluster. The maximum value of the degree of polarization is estimated to be 0.93% for members of the cluster using the Serkowski relation. The average value of wavelength corresponding to the maximum polarization of 0.54{+/-}0.02{mu}m indicates that the size distribution of dust grains in the line of sight is similar to that of the general interstellar medium. Several variable stars in the cluster were also observed polarimetrically and pulsating variables appear to have a slightly lower value of polarization from other nonvariable member stars of the cluster. There are indications of the existence of dust layers in front of those clusters which are located close to galactic plane while for clusters located away from galactic plane no major dust layers are observed.2020AJ....160..256Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/256CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/178 : Linear polarization measurements for 5070 stars (Axon+ 1976)II/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/349 : StarHorse, Gaia DR2 photo-astrometric distances (Anders+,2019)V/96 : Catalogue of open cluster parameters from UBV-data.(Loktin+, 1994)VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)J/ApJS/2/389 : Observations of O and B stars (Hiltner, 1956)J/A+A/359/347 : Reddening in open and globular clusters (Dutra+, 2000)J/A+A/426/819 : NGC1817 proper motions and membership (Balaguer-Nunez+,2004)J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)J/A+A/463/789 : Blue stragglers in open clusters (Ahumada+, 2007)J/A+A/462/621 : UBVRI polarisation in NGC 5749 (Vergne+, 2007)J/MNRAS/399/2146 : Orbits of open clusters in the Galaxy (Wu+, 2009)J/MNRAS/403/1577 : Polarization towards open cluster NGC 6823 (Medhi+, 2010)J/A+A/513/A75 : Polarimetry of stars in NGC 5617 (Orsatti+, 2010)J/A+A/522/A88 : Photometric identification of BHB stars (Smith+, 2010)J/MNRAS/403/2041 : Optical polarization in NGC 6124 (Vergne+, 2010)J/PASJ/63/S1 : Atlas & catalog dark clouds based on 2MASS (Dobashi+, 2011)J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)J/A+A/548/A97 : Catalogue of variable stars in open clusters (Zejda+, 2012)J/ApJ/764/172 : UBVRI photometry of stars toward NGC 1931 (Pandey+, 2013)J/A+A/618/A93 : Gaia DR2 open clusters in Milky Way (Cantat-Gaudin+, 2018)J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/256https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/256http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/256https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/256https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/256http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/256GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/160/256/table1 (Results of the broadband polarimetric observations of all stars toward the cluster NGC1817)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/256/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/256/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/256/table1?GETtext/xml+votable180.050000true78.027151916.74572670.0055555555555555566/24121https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/160/256?format=asciiOpticalInfrareddefaultJ/AJ/160/256/table1Results of the broadband polarimetric observations of all stars toward the cluster NGC1817PA(I)[67/179]? Polarization angle in I-banddegpos.posAngfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/125] Sequential number identificationmeta.recordintprimaryf_SeqFlag(s) on Seq (1)meta.codecharGaiaGaia DR2 identificationmeta.id;meta.mainOffset[0.02/1.21] Offset from Gaia DR2 positionarcsecpos;arith.difffloatP(B)[0.23/2.33]? Degree of polarization in B-band%phys.polarizationfloatnullablee_P(B)[0.01/0.8]? Error in P(B)%stat.errorfloatnullablePA(B)[65.6/180]? Polarization angle in B-banddegpos.posAngfloatnullablee_PA(B)[0.1/15]? Error in PA(B)degstat.errorfloatnullableP(V)[0.45/1.81]? Degree of polarization in V-band%phys.polarizationfloatnullablee_P(V)[0.01/0.71]? Error on P(V)%stat.errorfloatnullablePA(V)[83.3/167]? Polarization angle in V-banddegpos.posAngfloatnullablee_PA(V)[0.1/14.1]? Error in PA(V)degstat.errorfloatnullableP(R)[0.44/2.91]? Degree of polarization in R-band%phys.polarizationfloatnullablee_P(R)[0.01/0.92]? Error in P(R)%stat.errorfloatnullablePA(R)[80.6/178]? Polarization angle in R-banddegpos.posAngfloatnullablee_PA(R)[0.1/14.7]? Error in PA(R)degstat.errorfloatnullableP(I)[0.12/1.34]? Degree of polarization in I-band%phys.polarizationfloatnullablee_P(I)[0.01/0.41]? Error in P(I)%stat.errorfloatnullablee_PA(I)[0.1/14.5]? Error in PA(I)degstat.errorfloatnullableParammeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.mainJ/AJ/160/256/table3Parameters Pmax, lmax as obtained from fitting the Serkowski relationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/109] Sequential number identificationmeta.recordintf_Seq[*] Flag indicating members stars (49 occurrences)meta.codecharPmax[0.44/4.83] Maximum polarization%phys.polarization;stat.maxfloate_Pmax[0.01/1.23] Error on Pmax%stat.errorfloatlambda[0.2/1.03] Wavelength corresponding to Pmaxumem.wlfloate_lambda[0.01/0.36] Error on lambdaumstat.errorfloatsigma1[0/2.4] sigma1 ({sigma}1) valuestat.fit.paramfloat