J/MNRAS/463/2653ivo://CDS.VizieR/J/MNRAS/463/2653doi:10.26093/cds/vizier.74632653CDSDamineli A.Almeida L.A.Blum R.D.Damineli D.S.C.Navarete F.,Rubinho M.S.Teodoro M.2024-08-16T20:19:09Z2016-11-04T07:35:46ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesphotometryccd-photometryThe young stellar cluster Westerlund 1 (Wd 1: l=339.6, b=-0.4) is one of the most massive in the local Universe, but accurate parameters are pending on better determination of its extinction and distance. Based on our photometry and data collected from other sources, we have derived a reddening law for the cluster line-of-sight representative of the Galactic plane (-5{deg}<b<+5{deg}) in the window 0.4-4.8um. The power-law exponent alpha=2.13+/-0.08 is much steeper than those published a decade ago (1.6-1.8) and our index RV=2.50+/-0.04 also differs from them, but in very good agreement with recent works based on deep surveys in the inner Galaxy. As a consequence, the total extinction AKs=0.74+/-0.08 (AV=11.40+/-2.40) is substantially smaller than previous results (0.91-1.13), part of which (AKs=0.63 or AV=9.66) is from the interstellar medium. The extinction in front of the cluster spans a range of AV~8.7 with a gradient increasing from SW to NE across the cluster face, following the same general trend of warm dust distribution. The map of the J-Ks colour index also shows a trend of reddening in this direction. We measured the equivalent width of the diffuse interstellar band at 8620 A (the 'GAIA DIB') for Wd 1 cluster members and derived the relation AKs=0.612EW-0.191EW^2^. This extends the Munari et al. relation, valid for E(B-V)<1, to the non-linear regime (AV>4).2016MNRAS.463.2653Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/463/2653CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/127/423 : VI photometry of Westerlund 1 and 2 (Piatti+ 1998)J/AJ/133/2696 : BVRI light curves of Westerlund 1 stars (Bonanos, 2007)J/A+A/477/147 : X-ray sources in Westerlund 1 (Clark+, 2008)J/AJ/145/46 : UBVIc photometry in Westerlund 1 (Lim+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/463/2653https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/463/2653http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/463/2653https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/463/2653https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/463/2653http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/463/2653GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/463/2653/table2 (8620EW, AKs and AV for 110 stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/463/2653/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/463/2653/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/463/2653/table2?GETtext/xml+votable180.050000true164.04825-60.45355560.0055555555555555566/14692-14693 19202 28804 29116 37339 37923 37930 42199 42206-42207 42416 47760https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/463/2653?format=asciiOpticaldefaultJ/MNRAS/463/2653/table28620EW, AKs and AV for 110 starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the starmeta.id;meta.maincharEW8620? Equivalent width of the 8620{AA} DIB0.1nmspect.line.eqWidthfloatnullableAKsExtinction in the AKs bandmagphys.absorptionfloatAV? Extinction in the AV bandmagphys.absorptionfloatnullableObservObservatory/program/notemeta.id;instr.obstycharFlag[*] Excess emission (1)meta.code.errorchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.main