J/other/NewA/58.ivo://CDS.VizieR/J/other/NewA/58.1CDSCariddi S.Azatyan N.M.Kurfurst P.Stofanova L.Netopil M.,Paunzen E.Pintado O.I.Aidelman Y.J.2020-06-25T15:36:57Z2017-07-25T14:29:18ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometrypeculiar-variable-starsThe study of chemically peculiar (CP) stars in open clusters provides valuable information about their evolutionary status. Their detection can be performed using the Delta-a photometric system, which maps a characteristic flux depression at lambda 5200{AA}. This paper aims at studying the occurrence of CP stars in the earliest stages of evolution of a stellar population by applying this technique to Hogg 16, a very young Galactic open cluster (about 25Myr). We identified several peculiar candidates: two B-type stars with a negative Delta-a index (CD-60 4701, CPD-60 4706) are likely emission-line (Be) stars, even though spectral measurements are necessary for a proper classification of the second one; a third object (CD-60 4703), identified as a Be candidate in literature, appears to be a background B-type supergiant with no significant Delta-a index, which does not rule out the possibility that it is indeed peculiar as the normality line of Delta-a for supergiants has not been studied in detail yet. A fourth object (CD-60 4699) appears to be a magnetic CP star of 8 Msun, but obtained spectral data seem to rule out this hypothesis. Three more magnetic CP star candidates are found in the domain of early F-type stars. One is a probable nonmember and close to the border of significance, but the other two are probably pre-main sequence cluster objects. This is very promising, as it can lead to very strong constraints to the diffusion theory. Finally, we derived the fundamental parameters of Hogg 16 and provide for the first time an estimate of its metal content.2018NewA...58....1Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/58.1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/58.1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/58.1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/58.1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/58.1https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/58.1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/58.1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/NewA/58.1/hogg16 (Observed program stars of Hogg 16 (table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NewA/58.1/hogg16?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NewA/58.1/hogg16?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NewA/58.1/hogg16?GETtext/xml+votable180.050000true202.3031417-61.24024890.0055555555555555566/416993.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/NewA/58.1?format=asciidefaultJ/other/NewA/58.1/hogg16Observed program stars of Hogg 16 (table 4)IDSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAICRSRight ascension, ICRS, epoch=J2000degpos.eq.ra;meta.mainDEICRSDeclination, ICRS, epoch=J2000degpos.eq.dec;meta.main(g1-y)Mean colour index (g1-y)magphot.colorfloate_(g1-y)rms uncertainty on (g1-y)magstat.errorfloatamagMean a indexmagphot.colorfloate_amagrms uncertainty on amagstat.error;phot.magfloatDeltaa? Peculiarity index {Delta}a in mmag (1)mmagphot.magintnullable(b-y)Colour index (b-y) (2)magphot.color;em.opt.B;em.opt.VfloatVmagV magnitude (2)magphot.mag;em.opt.VfloatMember[m nm] Membership flag (m: member, nm: nonmember)meta.code.membercharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed