J/PASJ/60/739ivo://CDS.VizieR/J/PASJ/60/739doi:10.26093/cds/vizier/bj-1w-q3CDSNakano M.Sugitani K.Niwa T.Itoh Y.Watanabe M.2026-03-17T20:05:00Z2009-04-11T14:17:26ZCDS support team

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

cds-question@unistra.frh-ii-regionsvisible-astronomysloan-photometryline-intensitiesWe have made a new survey of emission-line stars in the W5 E HII region to investigate the population of PMS stars near the OB stars by using the Wide Field Grism Spectrograph 2 (WFGS2). A total of 139 Halpha emission stars were detected and their g'i'-photometry was performed. Their spatial distribution shows three aggregates, i.e., two aggregates near the bright-rimmed clouds at the edge of the W5 E HII region (BRC 13 and BRC 14) and one near the exciting O7V star. The age and mass of each Halpha star were estimated from an extinction-corrected color-magnitude diagram and theoretical evolutionary tracks. We found, for the first time in this region, that the young stars near the exciting star are systematically older (4Myr) than those near the edge of the HII region (1Myr). This result supports that the formation of stars proceeds sequentially from the center of HII region to the eastern bright rim. We further suggest a possibility that the birth of low-mass stars near the exciting star of the HII region precedes the production of massive OB stars in the pre-existing molecular cloud.2008PASJ...60..739Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/60/739CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/2597 : Halpha stars and HH objects near BRCs (Ogura+, 2002)J/PASJ/58/L29 : JHK photometry of low-mass stars in BRC 14 (Matsuyanagi+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/60/739https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/60/739http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/60/739https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/60/739https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/60/739http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/60/739GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/60/739/table3 (Summary of H{alpha} stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/60/739/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/60/739/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/60/739/table3?GETtext/xml+votable180.050000true44.713333360.66513890.0055555555555555566/3290 3301 3312https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/60/739?format=asciiOpticaldefaultJ/PASJ/60/739/table3Summary of H{alpha} starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NSN2008]Sequential numbermeta.recordintNameName (1)meta.idcharg'-i'? g'-i' colour indexmagphot.colorfloatnullablei'mag? i' magnitudemagphot.mag;em.opt.Ifloatnullablel_EWLimit flag on EWmeta.code.error;spect.line.eqWidthcharEW? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableAV? Absorption in V bandmagphot.mag;em.opt.Vfloatnullable2MASS2MASS name (HHMMSSss+DDMMSSs)meta.idcharq_2MASS[*] Good 2MASS quality flag (2)meta.code.qualcharFlag[wc] wc for weak continuummeta.code.errorcharRemOther names (3)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main