J/AJ/150/95ivo://CDS.VizieR/J/AJ/150/95doi:10.26093/cds/vizier.51500095CDSAzimlu M.Martinez-Galarza J.R.Muench A.A.2017-06-01T08:49:40Z2015-11-03T12:53:41ZCDS support team

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

cds-question@unistra.frstellar-associationspre-main-sequence-starsyoung-stellar-objectsstellar-massesstellar-agesWe have performed a Wide-Field Infrared Survey Explorer based study to identify and characterize young stellar objects (YSOs) in the 12{deg}x12{deg} Perseus OB2 association. A spectral energy distribution (SED) slope in the range of 3.4-12{mu}m and 5{sigma} selection criteria were used to select our initial sample. Further manual inspection reduced our final catalog to 156 known and 119 YSO candidates. The spatial distribution of newly found YSOs all over the field shows an older generation of star formation in which most of its massive members have evolved into main-sequence stars. In contrast, the majority of younger members lie within the Perseus molecular cloud and currently active star-forming clusters such as NGC 1333 and IC 348. We also identified an additional 66 point sources that passed YSO selection criteria but are likely AGB stars. However, their spatial distribution suggests that they may contain a fraction of the YSOs. Comparing our results with the commonly used color-color selections, we found that while the color selection method fails in picking up bright but evolved weak disks, our SED fitting method can identify such sources, including transitional disks. In addition, we have less contamination with background sources such as galaxies, but at a price of losing fainter (J_mag_>12) YSOs. Finally, we employed a Bayesian Monte Carlo SED fitting method to determine the characteristics of each YSO candidate. Distribution of SED slopes and model-driven age and mass confirms separated YSO populations with three suggested age groups of younger than 1Myr old, 1-5Myr old, and older than 5Myr, which agrees with the age of the Per OB2 association and currently star-forming sites within the cloud.2015AJ....150...95Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)I/317 : The PPMXL Catalog (Roeser+ 2010)J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)J/ApJS/175/509 : Ammonia spectral atlas in Perseus (Rosolowsky+, 2008)J/AJ/134/411 : Properties of IC 348 members (Muench+, 2007)J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)J/ApJ/646/1009 : Structures of dust in Perseus molecular cloud (Kirk+, 2006)J/A+A/384/145 : Catalog of Per OB2 star forming complex (Belikov+, 2002)J/ApJ/497/736 : The young cluster IC 348. (Herbig, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/95https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/95/stars (Physical parameters measured for: 119 new YSOs candidates , 156 known YSOs candidates , and 66 AGB candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/95/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/95/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/95/stars?GETtext/xml+votable180.050000true50.361382430.77932820.0055555555555555565/390 391 6/500 501 503 511 835 838 848 850 851 852 854 855 857 859 860 861 862 880 881 884 887 892 893 1154 1155 1156 1157 1159 1161 1166 1170 1176 1179 1188 1189 1191 1192 1194 1197 1198 1200 1201 1203 1204 1206 1207 1208 1211 1212 1213 1215 1250 1257 1258 1259 1538 1539 1541 1542 1543 1544 1545 1546 1548 1550 1551 1553 1554 1555 1557 1559 1568 1569 1571 1572 1575 1578 1579 1582 1584 1585 1586 1588 1600 1601 1603 1664 1667 1668https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/95?format=asciidefaultJ/AJ/150/95/starsPhysical parameters measured for: 119 new YSOs candidates , 156 known YSOs candidates , and 66 AGB candidatesAgeBF[0/9.89] Best fit model age (1)Myrtime.age;meta.modelledfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/156] Internal sequential numbermeta.idintNameCatalog identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainONameOther source identifiermeta.idcharalpha[-2.67/2.62] WISE 3-12{mu}m spectral indexspect.index;em.IR.4-8umfloate_alpha[0.02/0.53] Uncertainty in alphastat.error;spect.index;em.IR.4-8umfloatMassBF[0.1/17.26] Best fit model mass (1)solMassphys.mass;meta.modelledfloatMpeak[0.11/25.69] Peak model mass (2)solMassphys.mass;meta.modelled;stat.maxfloate_Mpeak? Uncertainty in MPeaksolMassstat.error;phys.mass;meta.modelledfloatnullableApeak[0/9.6] Peak model age (2)Myrtime.age;meta.modelled;stat.maxfloate_Apeak? Uncertainty in APeakMyrstat.error;time.age;meta.modelledfloatnullable