J/AJ/143/61ivo://CDS.VizieR/J/AJ/143/61doi:10.26093/cds/vizier.51430061CDSNakano M.Sugitani K.Watanabe M.Fukuda N.Ishihara D.Ueno M.2018-02-12T08:45:34Z2013-05-02T16:00:46ZCDS support team

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

cds-question@unistra.frh-ii-regionsemission-line-starspre-main-sequence-starsspectroscopyinfrared-photometryastronomical-object-identificationWe have made an extensive survey of emission-line stars in the IC 1396 H II region to investigate the low-mass population of pre-main-sequence (PMS) stars. A total of 639 H{alpha} emission-line stars were detected in an area of 4.2deg^2^ and their i' photometry was measured. Their spatial distribution exhibits several aggregates near the elephant trunk globule (Rim A) and bright-rimmed clouds at the edge of the H II region (Rim B and SFO 37, 38, 39, 41), and near HD206267, which is the main exciting star of the HII region. Based on the extinction estimated from the near-infrared color-color diagram, we have selected PMS star candidates associated with IC1396. The age and mass were derived from the extinction-corrected color-magnitude diagram and theoretical PMS tracks. Most of our PMS candidates have ages of <3Myr and masses of 0.2-0.6M_{sun}_. Although it appears that only a few stars were formed in the last 1Myr in the east region of the exciting star, the age difference among subregions in our surveyed area is not clear from the statistical test. Our results may suggest that massive stars were born after the continuous formation of low-mass stars for 10Myr. The birth of the exciting star could be the late stage of slow but contiguous star formation in the natal molecular cloud. It may have triggered the formation of many low-mass stars at the dense inhomogeneity in and around the HII region by a radiation-driven implosion.2012AJ....143...61Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/227 : General Catalog of galactic Carbon stars, 3d Ed. (Alksnis+ 2001III/256 : Vatican Emission-line stars (Coyne+ 1974-1983)J/MNRAS/415/103 : IPHAS T Tauri candidates in IC 1396 (Barentsen+, 2011)J/AJ/135/2323 : H{alpha} stars and HH objects near BRCs (Ikeda+, 2008)J/ApJ/654/316 : X-ray sources in IC 1396N (Getman+, 2007)J/ApJ/638/897 : IR photometry in Tr 37 and NGC 7160 (Sicilia-Aguilar+, 2006)J/AJ/132/2135 : Spectroscopy in Tr 37 (Sicilia-Aguilar+, 2006)J/AJ/130/188 : Young stars in Tr 37 & NGC 7160 (Sicilia-Aguilar+, 2005)J/AJ/128/805 : Low-mass stars in the Cep OB2 region (Sicilia-Aguilar+ 2004)J/AJ/123/2597 : H{alpha} stars and HH objects near BRCs (Ogura+, 2002)J/A+A/309/581 : CO observations of clouds in IC 1396 region (Weikard +, 1996)J/A+AS/112/35 : Emission lines from giant HII regions (Garcia Vargas+, 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/61https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/143/61/table2 (List of emission-line stars in IC 1396)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/61/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/61/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/61/table2?GETtext/xml+votable180.050000true322.72458358.0889440.0055555555555555565/3869 6/15455 15473 15475 15484 15485 15648 156501.5062136169708525e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/143/61?format=asciiOpticalInfrareddefaultJ/AJ/143/61/table2List of emission-line stars in IC 1396recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/639] Running sequence number (<[NSW2012] NNN> in Simbad)meta.id;meta.mainintRAJ2000[21] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[56/58] Degree of Declination (J2000)pos.eq.dec;meta.maini'mag[13.63/19.79]? The WFGS2 i' band AB magnitudemagphot.mag;em.opt.Ifloatnullablef_i'mag[s-] i'mag satured (s) or of low quality (-)meta.codecharEW[0/512]? Equivalent width of H{alpha} emission; in Angstroms0.1nmspect.line.eqWidth;em.line.Halphaintnullable2MASS2MASS identifier of the near-IR counterpart. (HHMMSSss+DDMMSSd; J2000) (1)meta.id.crosscharf_2MASS[6x g] Note on 2MASS counterpart (1)meta.codecharq_2MASS2MASS photometric quality (2)meta.code.qualcharJmag[8.51/17.39]? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableJ-H[0.15/2.13]? 2MASS (J-H) color indexmagphot.color;em.IR.J;em.IR.HfloatnullableH-K[-0.23/1.98]? 2MASS (H-Ks) color indexmagphot.color;em.IR.H;em.IR.KfloatnullableAv[0.06/9.52]? The V band extinction A_v_ (3)magphys.absorption;em.opt.VfloatnullableC*[f] f: Carbon star candidate flag (3 objects)meta.codecharNotesIdentification in the literature/comments (4)meta.note2M2MASS data (from Point-source catalog or 6x catalog) within 2"meta.ref.urlcharJ/AJ/143/61/refsReferencesRefReference codemeta.bibcharBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint