J/ApJS/185/451ivo://CDS.VizieR/J/ApJS/185/451doi:10.26093/cds/vizier.21850451CDSKun M.Balog Z.Kenyon S.J.Mamajek E.E.Gutermuth R.A.2017-12-22T05:33:29Z2010-05-31T20:26:43ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryvisible-astronomybroad-band-photometryspectroscopystellar-agesstellar-massesaccretiondiffuse-molecular-cloudsWe present results of optical spectroscopic and BVR_C_I_C_ photometric observations of 77 pre-main-sequence (PMS) stars in the Cepheus flare region. A total of 64 of these are newly confirmed PMS stars, originally selected from various published candidate lists. We estimate effective temperatures and luminosities for the PMS stars, and comparing the results with PMS evolutionary models, we estimate stellar masses of 0.2-2.4M_{sun}_ and stellar ages of 0.1-15Myr. Among the PMS stars, we identify 15 visual binaries with separations of 2-10". From archival IRAS, Two Micron All Sky Survey, and Spitzer data, we construct their spectral energy distributions (SEDs) and classify 5% of the stars as Class I, 10% as Flat SED, 60% as Class II, and 3% as Class III young stellar objects. We identify 12 classical T Tauri stars and two weak-line T Tauri stars as members of NGC 7023, with a mean age of 1.6Myr. The 13 PMS stars associated with L1228 belong to three small aggregates: RNO 129, L1228A, and L1228S. The age distribution of the 17 PMS stars associated with L1251 suggests that star formation has propagated with the expansion of the Cepheus flare shell. We detect sparse aggregates of ~6-7Myr old PMS stars around the dark clouds L1177 and L1219, at a distance of ~400pc. Three T Tauri stars appear to be associated with the Herbig Ae star SV Cep at a distance of 600pc. Our results confirm that the molecular complex in the Cepheus flare region contains clouds of various distances and star-forming histories.2009ApJS..185..451Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/185/451CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/272/235 : Stars in the dark cloud L1251 (Kun+ 1993)J/ApJS/115/59 : Cepheus flare molecular clouds (Kun, 1998)J/ApJS/184/18 : Young stellar clusters Spitzer survey (Gutermuth+, 2009)J/ApJS/185/198 : The Cepheus flare observed with IRAC and MIPS (Kirk+, 2009)J/BaltA/18/33 : Photometry of stars around NGC 7023 (Zdanavicius+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/185/451https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/185/451http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/185/451https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/185/451https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/185/451http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/185/451GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/185/451/table1 (List of observed PMS stars and associated clouds)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/185/451/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/185/451/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/185/451/table1?GETtext/xml+votable180.050000true309.0827567.94211110.005555555555555556Cone search capability for table J/ApJS/185/451/table2 (List of the observed stars rejected as PMS stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/185/451/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/185/451/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/185/451/table2?GETtext/xml+votable180.050000true305.038708373.86197220.0055555555555555565/3962 4047 6/15759 15779 15781 15790 15791 15794 15796 15797 15798 15800 15803 15807 15818 15819 15840 15842 15843 15852 15855 15857 15858 15859 15860 15864 15865 15866 15965 15988 16129 16131 16133 16143 16144 16146 16150 16165 16166 16169 16174 16176 16184 16185 16187 16192 16193 16197 16203 16204 16208 16225 16226 16242 16277 16279 16320 16321 16322 16333https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/185/451?format=asciiOpticalInfrareddefaultJ/ApJS/185/451/table1List of observed PMS stars and associated cloudsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryf_Name[bc] Binarity reported (1)meta.codecharONamesOther name(s)meta.idcharIRASIRAS identification (HHMMs+DDMM with or without F at the beginning)meta.id.crosschar2MASS2MASS identification (HHMMSSss+DDMMSSs)meta.id.crosscharSpitz? Spitzer id. (2)meta.idintnullablen_Spitz[?n] Flag on Spitzer id. (2)meta.notecharCloud? Name of the associated cloudmeta.id.parentcharCTypeCandidate type (CTTS, H{alpha}, IRAS, etc.)src.classcharRefReference(s) in refs.dat filemeta.ref;pos.frame;meta.filecharSimbadNameSimbad column added by the CDSmeta.idchar_RARight ascension (derived from 2MASS) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from 2MASS) for Eq=J2000degpos.eq.dec;meta.mainJ/ApJS/185/451/table2List of the observed stars rejected as PMS starsCommCommentmeta.noteNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identificationmeta.id.crosscharInstInstrument used in observationinstr.setup;obscharRefReference (1)meta.ref;pos.framecharSimbadNameSimbad column added by the CDSmeta.idchar_RARight ascension (derived from 2MASS) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from 2MASS) for Eq=J2000degpos.eq.dec;meta.mainJ/ApJS/185/451/table5Photometric data of the observed starsVmag? Johnson V-band magnitude (1)magphot.mag;em.opt.VfloatnullableCommComment (variability)meta.noterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharm_Name[ABW] Componentmeta.code.multipcharBmag? Johnson B-band magnitude (1)magphot.mag;em.opt.Bfloatnullablee_Bmag? Uncertainty in Bmag (2)magstat.error;phot.mag;em.opt.Bfloatnullablee_Vmag? Uncertainty in Vmag (2)magstat.error;phot.mag;em.opt.VfloatnullableRcmag? Cousins R-band magnitude (1)magphot.mag;em.opt.Rfloatnullablee_Rcmag? Uncertainty in Rcmag (2)magstat.error;phot.mag;em.opt.RfloatnullableIcmagCousins I-band magnitude (1)magphot.mag;em.opt.Ifloate_Icmag? Uncertainty in Icmag (2)magstat.error;phot.mag;em.opt.IfloatnullableJ/ApJS/185/451/table7Parameters of observed stars, derived from our optical datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudAssociated clouds namemeta.id.parentcharNameStar namemeta.id;meta.maincharAVVisual extinction A_V_ derived from the color excessesmagphys.absorption;em.opt.VfloatLbolBolometric luminosity of the starsolLumphys.luminosityfloatTeffEffective temperature derived from the spectral classificationKphys.temperature.effectiveintMass? Star mass derived from HR diagramssolMassphys.massfloatnullableAge? Age of the star derived from the HRDMyrtime.agefloatnullableu_Age[:] Uncertainty flag on Agemeta.code.error;time.agecharlog(Md)1? Log of accretion rate from disk1 (1)log(solMass.yr**-1)phys.mass.lossfloatnullablelog(Md)2? Log of accretion rate from disk2 (1)log(solMass.yr**-1)phys.mass.lossfloatnullablelog(Md)3? Log of accretion rate from disk3 (1)log(solMass.yr**-1)phys.mass.lossfloatnullableJ/ApJS/185/451/refsReferences in table 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorchar