J/A+A/639/A64ivo://CDS.VizieR/J/A+A/639/A64doi:10.26093/cds/vizier.36390064CDSRatzenboeck S.Meingast S.Alves J.Moeller T.Bomze I.2022-11-21T14:53:08Z2020-07-07T09:24:20ZCDS support team

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

cds-question@unistra.fropen-star-clustersastrometryNearby stellar streams carry unique information on the dynamical evolution and disruption of stellar systems in the Galaxy, the mass distribution in the disk, and they provide unique targets for planet formation and evolution studies. Recently, Meingast 1, a 120{deg} stellar stream with a length of at least 400pc, was discovered. We aim to revisit the Meingast 1 stream to search for new members within its currently known 400pc extent, using Gaia DR2 data and an innovative machine learning approach. We used a bagging classifier of one-class support vector machines with Gaia DR2 data to perform a 5D search (positions and proper motions) for new stream members. The ensemble was created by randomly sampling 2.4 million hyper-parameter realizations admitting classifiers that fulfill a set of prior assumptions. We used the variable prediction frequency resulting from the multitude of classifiers to estimate a stream membership criterion, which we used to select high-fidelity sources. We used the HR diagram and the Cartesian velocity distribution as test and validation tools. We find about 2000 stream members with high fidelity, or about an order of magnitude more than previously known, unveiling the stream's population across the entire stellar mass spectrum, from B stars to M stars, including white dwarfs. We find that, apart from being slightly more metal poor, the HRD of the stream is indistinguishable from that of the Pleiades cluster. For the mass range at which we are mostly complete, ~0.2M_{sun}_<M<~4M_{sun}_, we find a normal IMF, allowing us to estimate the total mass of stream to be about 2000M_{sun}_, making this relatively young stream by far the most massive one known. In addition, we identify several white dwarfs as potential stream members. The nearby Meingast 1 stream, due to its richness, age, and distance, is a new fundamental laboratory for star and planet formation and evolution studies for the poorly studied and gravitationally unbound star formation mode. We also demonstrate that one-class support vector machines can be effectively used to unveil the full stellar populations of nearby stellar systems with Gaia data.2020A&A...639A..64Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/639/A64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)J/A+A/624/L11 : Coma Berenices neighbor moving group (Fuernkranz+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/639/A64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/639/A64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/639/A64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/639/A64https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/639/A64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/639/A64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/639/A64/catalog (Meingast 1 extended source selection)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/639/A64/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/639/A64/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/639/A64/catalog?GETtext/xml+votable180.050000true27.1665171-7.64354830.0055555555555555564/1410-1411 1414 1420 5/4245 4336 4345 4398 4414 4417 4419 4424 4451 4494 4501 4507 4516 4518 4520 4522 4527 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36109 36115-36116 36118 36124 36135 36137 36142 36148-36149 36151-36152 36154 36156 36158 36161 36163 36165 36167 36170-36172 36179 36181-36185 36187 36189 36191 36193 36195 36197 36199 36202-36203 36208-36209 36211 36213-36215 36228 36230 36235 36245 36247 36250 36252-36254 36257 36261 36263 36267-36269 36274-36275 36277 36280-36282 36285-36286 36289-36291 36293-36294 36297 36299-36302 36308-36310 36312-36313 36315 36320 36322-36324 36326-36327 36329-36331 36333-36334 36348 36350-36351 36356 36358 36363 36366 36371 36382 36392 36401 36432 36434 36442-36445 36449 36463 36467-36468 36474-36475 36477-36478 36488-36489 36493 36495 36517 36519 36523 36526 36532 36537 36540-36541 36556 36559 36561 36570 36576 36580-36581 36584 36586 36588-36589 36596 36603 36606 36608 36610 36612 36622-36624 36628-36629 36631-36632 36634 36636-36637 36639 36642 36644 36646 36654-36655 36660-36661 36663 36669-36671 36677-36678 36681-36685 36687 36689-36693 36696-36698 36701-36704 36707 36712-36713 36715 36720 36722-36723 36725-36730 36732 36734-36736 36739-36740 36742 36752 36756 36758 36762-36764 36767 36771-36774 36776 36786-36788 36793-36794 36799 36809 36811 36815-36818 36829-36830 36832-36833 36836-36837 36840-36841 36845 36848-36849 36852 36855-36858 36860 36862 46557 46975 47095https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/639/A64?format=asciidefaultJ/A+A/639/A64/catalogMeingast 1 extended source selectionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 unique source identifiermeta.id;meta.mainRA_ICRSRight ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainXGalactic Cartesian X positionpcpos.distance;pos.cartesian.x;pos.galacticdoubleYGalactic Cartesian Y positionpcpos.distance;pos.cartesian.y;pos.galacticdoubleZGalactic Cartesian Z positionpcpos.distance;pos.cartesian.z;pos.galacticdoublepmRA*Gaia DR2 proper motion in RA direction, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublepmDEGaia DR2 proper motion in DE directionmas/yrpos.pm;pos.eq.decdoubleStabSource fidelity measure%meta.code.qualdoubleQ1[0/1] Employed quality filter 1meta.code.qual;instr.filterintQ2[0/1] Employed quality filter 2meta.code.qual;instr.filterintSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexed