GALAH semi-automated classification scheme J/ApJS/228/24 ivo://CDS.VizieR/J/ApJS/228/24 doi:10.26093/cds/vizier.22280024 CDS Traven G. Matijevic G. Zwitter T. Zerjal M. Kos J. Asplund M.,Bland-Hawthorn J. Casey A.R. De Silva G. Freeman K. Lin J.,Martell S.L. Schlesinger K.J. Sharma S. Simpson J.D. Zucker D.B.,Anguiano B. Da Costa G. Duong L. Horner J. Hyde E.A. Kafle P.R.,Munari U. Nataf D. Navin C.A. Reid W. Ting Y.-S. 2018-02-12T08:45:34Z 2017-05-05T12:00:44Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys milky-way-galaxy Galah is an ongoing high-resolution spectroscopic survey with the goal of disentangling the formation history of the Milky Way using the fossil remnants of disrupted star formation sites that are now dispersed around the Galaxy. It is targeting a randomly selected magnitude-limited (V<=14) sample of stars, with the goal of observing one million objects. To date, 300000 spectra have been obtained. Not all of them are correctly processed by parameter estimation pipelines, and we need to know about them. We present a semi-automated classification scheme that identifies different types of peculiar spectral morphologies in an effort to discover and flag potentially problematic spectra and thus help to preserve the integrity of the survey results. To this end, we employ the recently developed dimensionality reduction technique t-SNE (t-distributed stochastic neighbor embedding), which enables us to represent the complex spectral morphology in a two-dimensional projection map while still preserving the properties of the local neighborhoods of spectra. We find that the majority (178483) of the 209533 Galah spectra considered in this study represents normal single stars, whereas 31050 peculiar and problematic spectra with very diverse spectral features pertaining to 28579 stars are distributed into 10 classification categories: hot stars, cool metal-poor giants, molecular absorption bands, binary stars, H{alpha}/H{beta} emission, H{alpha}/H{beta} emission superimposed on absorption, H{alpha}/H{beta} P-Cygni, H{alpha}/H{beta} inverted P-Cygni, lithium absorption, and problematic. Classified spectra with supplementary information are presented in the catalog, indicating candidates for follow-up observations and population studies of the short-lived phases of stellar evolution. 2017ApJS..228...24T https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/228/24 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014) B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014) I/337 : Gaia DR1 (Gaia Collaboration, 2016) V/146 : LAMOST DR1 catalogs (Luo+, 2015) II/328 : AllWISE Data Release (Cutri+ 2013) II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) J/MNRAS/465/3203 : GALAH observational overview (Martell+, 2017) J/A+A/581/A52 : Gaia-ESO Survey: H{alpha} emission stars (Traven+, 2015) J/ApJ/808/16 : The Cannon: new approach to determine abundances (Ness+, 2015) J/AcA/63/21 : VI light curves of Galactic LPVs (Soszynski+, 2013) J/AJ/140/184 : RAVE double-lined spectroscopic binaries (Matijevic+, 2010) http://galah-survey.org/ : GALAH home page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/228/24 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/228/24 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/228/24 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/228/24 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/228/24 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/228/24 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/228/24/table4 (Catalog containing results of our classification) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/228/24/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/228/24/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/228/24/table4? 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Should Not be used for identification. meta.record int Seq [144/12188] Internal catalog index number meta.id;meta.main int BibCode ADS bibcode meta.bib.bibcode char Title Title of the reference meta.ref;pos.frame char
J/ApJS/228/24/table4 Catalog containing results of our classification recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Seq [0/12209] Internal catalog index number (1) meta.id int GALAH [0/9520722] GALAH unique identifier meta.id;meta.main int MJD Modified Julian Date of observation d time.epoch double RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main GClass General classification category (see table 1) src.class char SClass Specific classification category (see table 3) src.class char Simbad SIMBAD identifier for 3289 sources meta.id.cross char Sep [0/1]? Angular distance from Galah target to SIMBAD source arcsec pos.angDistance double nullable MType Main SIMBAD type src.class char OType Other SIMBAD type src.class char nRad [0/1] Number of VizieR tables for radio range meta.number int nIR [0/31] Number of VizieR tables for IR range meta.number int nOpt [0/61] Number of VizieR tables for optical range meta.number int nUV [0/2] Number of VizieR tables for UV range meta.number int nEUV [0] Number of VizieR tables for EUV range meta.number int nXRay [0/19] Number of VizieR tables for X-ray range meta.number int nGam [0] Number of VizieR tables for Gamma-ray range meta.number int OClass OGLE variable star type/class src.class char Ref Display the references for this source meta.ref.url int nullable M17 Display data from Martell+, 2017, J/MNRAS/465/3203, if any meta.ref.url int nullable
J/ApJS/228/24/table1 *Classification categories based on the general projection map recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Cat Classification category (1) src.class char o_Cat [18/4130] Number of sources in Cat meta.number int MType SIMBAD main source type (2) src.class char o_MType [0/371] Number of sources in MType meta.number int OType SIMBAD other source type (2) src.class char o_OType [0/1486] Number of sources in OType meta.number int
J/ApJS/228/24/table3 *Classification categories based on the specific projection map produced in the search for young/active stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Cat Classification category (1) src.class char o_Cat [18/4130] Number of sources in Cat meta.number int MType SIMBAD main source type (2) src.class char o_MType [0/371] Number of sources in MType meta.number int OType SIMBAD other source type (2) src.class char o_OType [0/1486] Number of sources in OType meta.number int