J/A+A/395/823ivo://CDS.VizieR/J/A+A/395/823doi:10.26093/cds/vizier.33950823CDSPaunzen E.Maitzen H.M.2003-09-30T12:24:04Z2003-09-30T12:23:42ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometrynarrow-band-photometryThe time scale on which chemical peculiarity in upper main sequence stars begins is unknown. Results from the Hipparcos measurements indicate that the classical chemically peculiar (CP) stars occupy the whole area from the zero age main sequence to the terminal age main sequence. Hubrig et al. (2000ApJ...539..352H) reported that the magnetic fields appear only in stars that have already completed at least approximately 30% of their main sequence life time. Previous observations in the very young Orion OB1 and Scorpio Centaurus associations reveal a percentage of chemically peculiar stars that is significantly smaller (less than 5%) than that of the galactic field (up to 25%). This already indicates that the phenomenon needs at least several Myr to appear. Since no further observations have been published since then, we have observed the five very young (1Myr<Age<25Myr) open clusters Collinder 272, Pismis 20, Lynga 14, NGC 6396 and NGC 6611. Photometry from 250 CCD frames in the three filter Delta a-system results in very low detection limits (0.008 to 0.015mag). We find no single photometrically chemically peculiar candidate in approximately 460 observed cluster members in the five program clusters. From the number of observed objects we deduce upper limits between 0.6% and 2.4% for the incidence of CP stars for the five observed aggregates.The tables presented here include all photometric observations of these five clusters. For a description of the (Delta a) photometric system, see e.g. <GCPD/75>: a = g2 - (g1+y)/2 g1 and g2 centered at 502 and 524nm.2002A&A...395..823Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/395/823CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/371/L5 : CCD {Delta}a-photometry of NGC 1866 (Maitzen+, 2001)J/A+A/373/153 : NGC 2489, 2567, 2658, 5281 and 6208 (Paunzen+, 2001)J/A+A/385/867 : NGC 2439, 3960, 6134, 6192 and 6451 (Paunzen+, 2002)J/A+A/412/721 : NGC 2099, 3114, 6204, 6705 and 6756 (Paunzen+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/395/823https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/395/823http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/395/823https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/395/823https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/395/823http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/395/823GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/395/823/table6 (Observed program stars of <&OCl "Lynga 14">)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/395/823/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/395/823/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/395/823/table6?GETtext/xml+votable180.050000true253.769961845-45.2972348960.005555555555555556Cone search capability for table J/A+A/395/823/table7 (Observed program stars of <&OCl "NGC 6396">)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/395/823/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/395/823/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/395/823/table7?GETtext/xml+votable180.050000true264.392890069-35.0594513150.005555555555555556Cone search capability for table J/A+A/395/823/table8 (Observed program stars of <&OCl "NGC 6611">)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/395/823/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/395/823/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/395/823/table8?GETtext/xml+votable180.050000true274.6836578-13.81560860.0055555555555555566/28800 29463 42376https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/395/823?format=asciiOpticaldefaultJ/A+A/395/823/table4Observed program stars of <&OCl "Col 272"|Collinder 272>e_aSigma amagstat.errorfloatXposX-coordinatepixpos.cartesian.x;instr.detfloatYposY-coordinatepixpos.cartesian.y;instr.detfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumber in Collinder 22, sorted after X and Y Cl* Collinder 272 PPM NNN in Simbadmeta.idintWEBDA? Notation according to WEBDA (Cl* Collinder 272 VBF NNN in Simbad)meta.idintnullableVmagMean V valuemagphot.mag;em.opt.VfloataMean a index (Maitzen)magphot.colorfloatg1-yMean (g1-y) indexmagphot.colorfloate_g1-ySigma (g1-y)magstat.errorfloatda(g1-y)Deviation from cluster line (Delta a)magstat.fit;arith.zpdoubleB-V? (B-V) from the literaturemagphot.color;em.opt.B;em.opt.Vfloatnullableda(B-V)? Deviation from cluster line (Delta a)magstat.fit;arith.zpfloatnullableObsNumber of observationsmeta.numberintJ/A+A/395/823/table5Observed program stars of <&OCl "Pismis 20">recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumber in Pismis 20, sorted after X and Y Cl* Pismis 20 PPM NNN in Simbadmeta.idintWEBDA? Notation according to WEBDAmeta.idintnullableXposX-coordinatepixpos.cartesian.x;instr.detfloatYposY-coordinatepixpos.cartesian.y;instr.detfloatV0Mean V0 valuemagphot.mag;em.opt.VfloatacorrMean a(corr) index (Maitzen)magphot.colorfloate_acorrSigma a(corr)magstat.errorfloat(g1-y)0Mean (g1-y)0 indexmagphot.colorfloate_(g1-y)0Sigma (g1-y)0magstat.errorfloatda(g1-y)0Deviation from cluster line (Delta a)magstat.fit;arith.zpfloat(B-V)0? (B-V)0 from the literaturemagphot.color;em.opt.B;em.opt.Vfloatnullableda(B-V0)? Deviation from cluster line (Delta a)magstat.stdevfloatnullableE(B-V)Reddeningmagphot.color.excessfloatObsNumber of observationsmeta.numberintJ/A+A/395/823/table6Observed program stars of <&OCl "Lynga 14">E(B-V)reddeningmagphot.color.excessfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumber in Lynga 14, sorted after X and Y Cl* Lynga 14 PPM NNN in Simbadmeta.idintWEBDA? Notation according to WEBDA (Cl* Lynga 14 NNN in Simbad)meta.idintnullableXposX-coordinatepixpos.cartesian.x;instr.detfloatYposY-coordinatepixpos.cartesian.y;instr.detfloatV0Mean V0 valuemagphot.mag;em.opt.VfloatacorrMean a(corr) indexmagphot.colorfloate_acorrSigma a(corr)magstat.errorfloat(g1-y)0Mean (g1-y)0 indexmagphot.colorfloate_(g1-y)0Sigma (g1-y)0magstat.errorfloatda(g1-y)0Deviation from cluster line (Delta a)magstat.fit;arith.zpfloat(B-V)0? (B-V)0 from the literaturemagphot.color;em.opt.B;em.opt.VfloatnullableObsNumber of observationsmeta.numberint_RAJ2000 Positions computed from (Xpos,Ypos) by VizieR (right ascension part)degpos.eq.ra;meta.main_DEJ2000 Positions computed from (Xpos,Ypos) by VizieR (declination part)degpos.eq.dec;meta.mainJ/A+A/395/823/table7Observed program stars of <&OCl "NGC 6396">recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumber in NGC 6369, sorted after X and Y Cl* NGC 6369 PPM NNN in Simbadmeta.idintMV? Notation according to Moffat & Vogt (1975A&AS...20..155M, NGC 6396 NN)phys.magAbs;em.optintnullableXposX-coordinatepixpos.cartesian.x;instr.detfloatYposY-coordinatepixpos.cartesian.y;instr.detfloatV0Mean V0 valuemagphot.mag;em.opt.VfloatacorrMean a(corr) index (Maitzen)magphot.colorfloate_acorrSigma a(corr)magstat.errorfloat(g1-y)0Mean (g1-y)0 indexmagphot.colorfloate_(g1-y)0Sigma (g1-y)0magstat.errorfloatda(g1-y)0Deviation from cluster line (Delta a)magstat.fit;arith.zpfloat(B-V)0? (B-V)0 from the literaturemagphot.color;em.opt.B;em.opt.VfloatnullableE(B-V)reddeningmagphot.color.excessfloatObsNumber of observationsmeta.numberint_RAJ2000 Positions computed from (Xpos,Ypos) by VizieR (right ascension part)degpos.eq.ra;meta.main_DEJ2000 Positions computed from (Xpos,Ypos) by VizieR (declination part)degpos.eq.dec;meta.mainJ/A+A/395/823/table8Observed program stars of <&OCl "NGC 6611">recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumber in NGC 6611, sorted after X and Y Cl* NGC 6611 PPM NNN in Simbadmeta.idintBKP? Notation according to Belikov et al. (1999, Cat. <J/A+AS/134/525>, Cl* NGC 6611 BKP NNNNN)meta.idintnullableNo3? Notation according to WEBDA (NGC 6611 NNN in Simbad)meta.idintnullableXposX-coordinatepixpos.cartesian.x;instr.detfloatYposY-coordinatepixpos.cartesian.y;instr.detfloatV0Mean V0 valuemagphot.mag;em.opt.VfloatacorrMean a(corr) index (Maitzen)magphot.colorfloate_acorrSigma a(corr)magstat.errorfloat(g1-y)0Mean (g1-y)0 indexmagphot.colorfloate_(g1-y)0Sigma (g1-y)0magstat.errorfloatda(g1-y)0Deviation from cluster line (Delta a)magstat.fit;arith.zpfloat(B-V)0? (B-V)0 from the literaturemagphot.color;em.opt.B;em.opt.Vfloatnullableda(B-V)0? Deviation from cluster line (Delta a)magstat.stdevfloatnullableE(B-V)reddeningmagphot.color.excessfloatObsNumber of observationsmeta.numberint_RAJ2000 Positions computed from (Xpos,Ypos) by VizieR (right ascension part)degpos.eq.ra;meta.main_DEJ2000 Positions computed from (Xpos,Ypos) by VizieR (declination part)degpos.eq.dec;meta.main