J/MNRAS/484/4591ivo://CDS.VizieR/J/MNRAS/484/4591doi:10.26093/cds/vizier.74844591CDSZerjal M.Ireland M.J.Nordlander T.Lin J.Buder S.Casagrande L.,Cotar K.De Silva G.Horner J.Martell S.Traven G.Zwitter T.,(the GALAH Collaboration)2024-09-16T20:17:41Z2022-10-10T13:40:50ZCDS support team

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

cds-question@unistra.frchemical-abundanceslate-type-starspre-main-sequence-starsline-intensitiesIdentifying and characterizing young stars in the Solar neighbourhood is essential to find and describe planets in the early stages of their evolution. This work seeks to identify nearby young stars showing a lithium 6708{AA} absorption line in the GALAH survey. A robust, data-driven approach is used to search for corresponding templates in the pool of 434215 measured dwarf spectra in the survey. It enables a model-free search for best-matching spectral templates for all stars, including M dwarfs with strong molecular absorption bands. 3147 stars have been found to have measurable lithium: 1408G and 892 K0-K5 dwarfs (EW(Li)>0.1{AA}), 335 K5-K9 (>0.07{AA}) and 512 M0-M4 dwarfs (>0.05{AA}). Stars with such lithium features are used to investigate the possibility of searching for young stars above the main sequence based merely on their parallaxes and broad-band photometry. The selection of young stars above the main sequence is highly effective for M dwarfs, moderately effective for K dwarfs and ineffective for G dwarfs. Using a combination of the lithium information and the complete 6D kinematics from Gaia and GALAH, 305 new candidate moving group members have been found, 123 of which belong to the Scorpius-Centaurus association, 36 to the Pleiades and 25 to the Hyades clusters.2019MNRAS.484.4591Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/484/4591CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/484/4591https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/484/4591http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/484/4591https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/484/4591https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/484/4591http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/484/4591GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/484/4591/table3 (List of candidate members of known moving groups based on the Banyan {Sigma} (Gagne et al. 2018ApJ...856...23G, Cat. J/ApJ/856/23) algorithms)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/484/4591/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/484/4591/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/484/4591/table3?GETtext/xml+votable180.050000true199.4218964-49.86199750.0055555555555555565/115 5881 6048 11094 6/271 276 310 320 322 337 340-342 349 367 378 407 437 452 454 458-459 467 470 472-474 478 480 485 496 1024 1026 1032-1033 1035 1055 20560 20672 20879 20903 21069 23487 23501 23503 23509 23511 23518 23523 23529 23532 23537-23540 23542 23544-23545 23547-23548 24105 24107 24115 24201 24204-24205 24232 24234 24243 24293 24297-24298 29187 33060 33099 33108 33225 33239 33809 33814 33874 33889 33944 36948 36975 37085 37096 37230-37231 37385 37508 37510 37518 37520 37567 37608 37641 38151 38228 38930 38942 38945 38949 38970 38973 39073 39078 39664-39665 40137 40997 41021 41064 41080 41086 41325 41336 41484 41977 41979 42096 42619 42648-42649 42653-42654 42664 42682-42683 42685 42696 42699 42731 42734 42890 42898 42907 42912 42932 42943 42949 42952-42953 42958 42978-42981 42984 42990 42994-42995 43000-43001 43003 43129 43181 43183 43198 43208 43213 43217 43220 43232 43246 43254 43278 43283 43293 43303-43304 43307 43313 43322 43337 43348 43350 43352 43359 43361-43362 43371 43380 43383 43392 43394-43395 43402 43431 43457 43463-43464 43466 43525 43529 43532-43533 43535-43536 43538 43549 43553 43557 43572 43592 43632 43663 43783 44038 44047 44069 44088 44092 44115 44204 44242 44300-44301 44303 44308 44310 44312 44317 44319 44321 44349 44352-44353 44356-44358 44360 44362 44365 44367 44380 44388 44394 44397 44400 44403-44404 44528 45117 45321 45449 45617 45662 47335 47645 47730 47858 48061 48257https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/484/4591?format=asciidefaultJ/MNRAS/484/4591/table1List of GALAH stars with measured lithium equivalent widthrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGaia DR2 or 2MASS identifiermeta.id;meta.maincharEW(Li)? Equivalent width of the lithium 6708{AA} line0.1nmspect.line.eqWidthfloatnullablee_EW(Li)? Lower error on EW(Li)0.1nmstat.errorfloatnullableE_EW(Li)? Upper error on EW(Li)0.1nmstat.error;stat.maxfloatnullableJ/MNRAS/484/4591/table3List of candidate members of known moving groups based on the Banyan {Sigma} (Gagne et al. 2018ApJ...856...23G, Cat. J/ApJ/856/23) algorithmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source identifiermeta.id;meta.mainEW(Li)? Equivalent width of the lithium 6708{AA} line0.1nmspect.line.eqWidthfloatnullablee_EW(Li)? Lower error on EW(Li)0.1nmstat.errorfloatnullableE_EW(Li)? Upper error on EW(Li)0.1nmstat.error;stat.maxfloatnullablebonafideMoving group of bonafide stars (confirmed members) from Gagne et al. 2018ApJ...856...23G, Cat. J/ApJ/856/23)meta.idcharhypotBest hypothesis from the Banyan {Sigma} results (1)meta.codecharpProbability from the Banyan {Sigma} results (1)stat.probabilityfloatf_EW(Li)Flag indicating whether lithium is at least as strong as expected for stellar agemeta.codecharXGalactic X positionpcpos.distance;pos.cartesian.x;pos.galacticdoublee_XError on Xpcstat.error;pos.cartesian.xfloatYGalactic Y positionpcpos.distance;pos.cartesian.y;pos.galacticdoublee_YError on Ypcstat.error;pos.cartesian.yfloatZGalactic Z positionpcpos.distance;pos.cartesian.z;pos.galacticdoublee_ZError on Zpcstat.error;src.redshiftfloatUU-velocity componentkm/sphys.veloc;pos.cartesian.xfloate_UError on Ukm/sstat.error;pos.cartesian.xfloatVV-velocity componentkm/sphys.veloc;pos.cartesian.yfloate_VError on Vkm/sstat.error;pos.cartesian.yfloatWW-velocity componentkm/sphys.veloc;pos.cartesian.zfloate_WError on Wkm/sstat.error;pos.cartesian.zfloat_RAfrom Simbad and Gaia DR2 (right ascension part)degpos.eq.ra;meta.main_DEfrom Simbad and Gaia DR2 (declination part)degpos.eq.dec;meta.main