J/A+A/681/A72ivo://CDS.VizieR/J/A+A/681/A72doi:10.26093/cds/vizier.36810072CDSGomez de Castro A.I.de la Fuente Marcos R.Canet A.Beitia-Antero L.,Yanez-Gestoso J.Vallejo J.C.2024-11-28T20:05:57Z2024-01-17T07:47:53ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomytrigonometric-parallaxproper-motionsDetermining a complete census of young stars in any star forming region is a challenge even for the nearest and best-observed molecular clouds, such as Taurus-Auriga (TAMC). Deep surveys at infrared (IR) and X-ray wavelengths and astrometric surveys using Gaia DR2 and DR3 have been carried out to detect the sparse population and constrain the low-mass end of the initial mass function. These compilations have resulted in lists of more than 500 sources, including reliable members of the association and candidates. The astrometric information provided by the Gaia mission has proven to be of fundamental importance in evaluating these candidates. In the present work, we examine the list of 63 candidate T Tauri star (TTS) in the TAMC identified by their ultraviolet (UV) and IR colours measured from data obtained by the Galaxy Evolution Explorer all sky survey (GALEX-AIS) and the Two Microns All Sky Survey (2MASS), respectively. These sources have not been included in previous studies and the objectives of this work are twofold: to evaluate whether or not they are pre-main sequence (PMS) stars and to evaluate the true potentials of the UV-IR colour-colour diagram to detect PMS stars in wide fields. We retrieved the kinematic properties and the parallax of these sources from the Gaia DR3 catalogue and used them to evaluate their membership probability. We tested several classification algorithms to search for the kinematical groups, but made the final classification with k-means++ algorithms. We evaluated membership probability by applying logistic regression. In addition, we used spectroscopic information available in the archive of the Large Sky Area Multi Object Fiber Spectroscopic Telescope (LAMOST) to ascertain their PMS nature when available. About 20% of the candidates share the kinematics of the TAMC members. Among them, HD 281691 is a G8-type field star located in front of the cloud and HO Aur is likely a halo star given the very low metallicity provided by Gaia. The remaining sources included three known PMS stars (HD 30171, V600 Aur and J04590305+3003004), two previously unknown accreting M-type stars (J04510713+1708468 and J05240794+2542438), and five additional sources that are very likely PMS stars. Most of these new sources are concentrated at low galactic latitudes over the Auriga-Perseus region.2024A&A...681A..72Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/681/A72CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/599/A14 : Taurus ultra-wide pairs (Joncour+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/681/A72https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/681/A72http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/681/A72https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/681/A72https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/681/A72http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/681/A72GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/681/A72/table2 (Sources from TAMC catalog that have Gaia DR3 counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/681/A72/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/681/A72/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/681/A72/table2?GETtext/xml+votable180.050000true64.05045806127.9440209980.0055555555555555565/270 6/325 336 342 350 377 1029 1031 1033 1037 1039-1040 1042-1043 1047-1048 1050-1052 1054 1061 1063 1068-1069 1073-1075 1078-1079 1084 1113-1115 1154 1156-1157 1159 1168-1170 23542 23548-23549 24201 24203 24221 24294-24295 24300https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/681/A72?format=asciiOpticaldefaultJ/A+A/681/A72/table2Sources from TAMC catalog that have Gaia DR3 counterparts_RA.icrsRight ascension (ICRS) (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.raindexed_DE.icrsDeclination (ICRS) (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.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitudedegpos.galactic.lon;meta.mainGLATGalactic latitudedegpos.galactic.lat;meta.mainplxParallaxmaspos.parallax.trigfloate_plxParallax errormasstat.error;pos.parallaxfloatpmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.rafloate_pmRAError in proper motion in right ascensionmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmDEError in proper motion in declinationmas/yrstat.error;pos.pm;pos.eq.decfloatRUWERenormalised unit weight errorstat.errorfloatGaiaDR3Gaia DR3 associated sourcemeta.ref.urlchar