J/A+AS/144/195ivo://CDS.VizieR/J/A+AS/144/195CDSOrsatti A.M.Vega E.I.Marraco H.G.2000-05-27T20:14:50Z2000-05-27T20:14:46ZCDS support team

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

cds-question@unistra.fropen-star-clusterspolarimetryinfrared-photometryvisible-astronomyWide-band photometryAn investigation on dust properties in the NW portion of NGC 6611 has been conducted polarimetrically to test the existence of abnormal extinction in that section of the open cluster in an independent way. As previously suggested for the {eta} Carinae nebula by Tapia et al. (1988, in Conference on Dust in the Universe, Bailey M.E. and Williams D.A. (eds.) Cambridge University Press, Cambridge, p.19) and subsequently confirmed by Marraco et al. (1993), the canonical relation between E_V-K_/E_B-V_ and {lambda}_max_ (the wavelength of maximum interstellar polarization) is not valid for stars belonging to dusty HII regions, as is the case for the observed portion of M 16. This may arise mainly from the presence of silicate grains of a slightly larger size than the standard ISM and also from a considerable increase in mean graphite grain size, according to previous results from Chini & Wargau (1990A&A...227..213C). About 50% of the observed stars in NGC 6611 present indications of intrinsic polarization in their measurements; a similar percentage was found in IC 2944 (Vega et al., 1994AJ....108.1834V), another young open cluster in close relation with an HII region.2000A&AS..144..195Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/144/195CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/134/525 : NGC 6611 compiled catalog (Belikov+ 1999)J/A+AS/121/223 : Multiphotometry of NGC 6611 (de Winter+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/144/195https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/144/195http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/144/195https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/144/195https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/144/195http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/144/195GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/144/195/object (Object positions from Simbad)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/144/195/object?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/144/195/object?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/144/195/object?GETtext/xml+votable180.050000true274.5375-13.7816670.0055555555555555566/29463 29506https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/144/195?format=asciiOpticalInfrareddefaultJ/A+AS/144/195/objectObject positions from SimbadrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNGC6611Star number (Walker, 1961ApJ...133..438W)intprimaryRAJ2000Right ascension (J2000.0)DEJ2000Declination (J2000.0)J/A+AS/144/195/table1UBVRI polarimetric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNGC6611Star number (Walker, 1961ApJ...133..438W) NGC 6611 NNN in Simbadintprimaryf_NGC6611[*] *: star considered as being "frontside"charNameHD, BD or H designation (1)charBand[UBVRI] Band (2)charPolObserved percentage polarisation%floate_Polrms uncertainty on Pol%floatPAObserved position angle of the electric vectordegfloate_PArms uncertainty on PAdegfloatn? Number of integrationsintnullablePolI? Intracluster percentage polarisation%floatnullablee_PolI? rms uncertainty on PolI%floatnullablePAI? Intracluster position angle of the electric vectordegfloatnullablee_PAI? rms uncertainty on PAIdegfloatnullable