GALAH emission-line stars J/MNRAS/500/4849 ivo://CDS.VizieR/J/MNRAS/500/4849 doi:10.26093/cds/vizier.75004849 CDS Cotar K Zwitter T. Traven G. Bland-Hawthorn J. Buder S. Hayden M.R.,Kos J. Lewis G.F. Martell S. L. Nordlander T. Stello D. Horner J.,Ting Y.-S. Zerjal M. GALAH collaboration 2024-08-21T20:16:54Z 2020-12-14T09:16:46Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr emission-line-stars be-stars peculiar-variable-stars spectroscopy We present a neural network autoencoder structure that is able to extract essential latent spectral features from observed spectra and then reconstruct a spectrum from those features. Because of the training with a set of unpeculiar spectra, the network is able to reproduce a spectrum of high signal-to-noise ratio that does not show any spectral peculiarities, even if they are present in an observed spectrum. Spectra generated in this manner were used to identify various emission features among spectra acquired by multiple surveys using the HERMES spectrograph at the Anglo-Australian telescope. Emission features were identified by a direct comparison of the observed and generated spectra. Using the described comparison procedure, we discovered 10364 candidate spectra with varying intensities (from partially filled-in to well above the continuum) of the H{alpha}/H{beta} emission component, produced by different physical mechanisms. A fraction of these spectra belong to the repeated observation that shows temporal variability in their emission profile. Among the emission spectra, we find objects that feature contributions from a nearby rarefied gas (identified through the emission of [NII] and [SII] lines) that was identified in 4004 spectra, which were not all identified as having H{alpha} emission. The positions of identified emission-line objects coincide with multiple known regions that harbour young stars. Similarly, detected nebular emission spectra coincide with visually prominent nebular clouds observable in the red all-sky photographic composites. 2021MNRAS.500.4849C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/500/4849 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018) 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/MNRAS/500/4849 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/500/4849 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/500/4849 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/500/4849 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/500/4849 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/500/4849 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/500/4849/emigalah (Catalogue of all analysed objects) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/500/4849/emigalah? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/500/4849/emigalah? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/500/4849/emigalah? 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40246-40247 40253-40254 40258-40261 40263 40272 40274 40285 40290 40300 40302 40306-40307 40318-40319 40323 40340 40342-40343 40348-40349 40351-40352 40363 40366-40369 40371 40382-40383 40392 40394 40403 40409 40411 40426-40427 40436-40437 40439 40471 40477 40516 40518 40530-40531 40534 40536-40537 40540 40543 40562 40568 40641 40643-40644 40646 40649 40651 40659 40664 40666-40669 40677 40679 40685 40687 40694-40698 40705 40707 40712-40713 40715 40720 40722 40728 40730 40736 40738 40767 40778-40779 40782 40797 40799-40801 40803-40804 40821 40857 40859-40860 40862-40863 40871-40872 40874-40875 40877 40879 40882 40884-40885 40888-40890 40896-40897 40906 40923 40926 40928 40930-40931 40940-40941 40943 40948 40950 40956 40958 40995 41001 41004-41005 41009-41011 41014-41017 41031 41035 41037-41039 41041-41043 41101 41103 41125 41127-41128 41130-41131 41133-41135 41144 41146-41147 41196 41200-41202 41204-41205 41230-41231 41235 41241-41243 41252-41253 41255 41268 41270-41271 41284-41286 41296-41297 41301 41303-41304 41306-41307 41309-41311 41314-41315 41332-41334 41372-41373 41376-41377 41380 41408-41410 41424 41426 41428-41429 41481 41483 41492-41493 41496 41506 41512 41514 41536 41607 41612-41614 41919 41951 41959 41973-41975 42000-42002 42004-42005 42007 42052 42054-42055 42091 42094 42096-42098 42100 42112-42113 42180-42182 42240-42241 42243 42264-42266 42308 42494-42495 42618-42619 42634-42635 42642-42643 42645-42647 42664-42665 42667 42672 42674-42675 42694-42695 42717 42719 42721 42797 42799 42812 42814 42846-42847 42865 42867 42872 42874 42883 42900 42903 42909-42911 42918-42919 42921 42923 42929-42931 42936 42939 42941-42943 42948-42949 42958-42960 42974-42975 42977-42982 42989-42991 42994-42995 43006 43034 43123 43165-43167 43181 43183 43185 43187 43201 43203 43256-43258 43271 43274-43275 43300-43301 43303 43324-43326 43330-43331 43334 43340-43341 43356 43358-43359 43365 43367 43370-43371 43374 43389 43405 43407-43410 43415 43436-43437 43439-43440 43442-43443 43452 43454-43458 43461 43463-43464 43466 43469 43476 43478 43480-43481 43488 43490-43491 43501-43503 43505 43507 43512 43514 43517 43523 43560-43562 43568-43569 43571 43579-43582 43606 43616 43618-43619 43624-43626 43628-43629 43631 43648 43650 43653 43655 43657-43659 43672-43674 43676-43677 43679 43684-43686 43692 43694-43695 43701 43708-43709 43711 43718 43724 43726-43727 43738 43741 43743 43760 43765 43779 43781-43783 43785 43787-43790 43800-43802 43804-43805 43808 43810 43815 43832 43835 43838-43839 43852 43854 43856 43858 43876 43881 43883 43898-43899 43902 43916 43918 43924-43926 43936 43938-43939 43942 43944-43945 43947-43948 43950-43951 43956-43958 43960-43962 43964 43972-43973 43975-43976 43978 43984-43986 43988 43990 44004 44006 44009 44028-44029 44032 44041 44043 44053 44055-44058 44064 44066 44069 44072 44077 44080 44082-44083 44086 44092 44094-44096 44098 44114-44115 44118-44119 44141 44143-44145 44148 44152-44154 44162-44163 44168-44169 44171 44181 44184 44186 44194-44195 44198-44201 44216 44218 44224 44229 44231 44236-44238 44240 44242-44245 44248 44257 44267 44270 44272 44274 44276-44277 44289-44291 44312 44314 44317 44319 44324 44326 44328-44330 44344 44346 44365 44367 44369 44371 44380-44381 44383 44385 44387 44392-44394 44396-44397 44399-44401 44403 44412-44413 44420-44422 44424-44426 44436-44438 44440-44442 44456-44457 44468-44470 44472-44474 44476 44479 44496-44497 44504 44506-44507 44512-44513 44515 44521-44526 44528-44529 44545-44547 44549-44551 44576-44577 44580 44592-44593 44596-44597 44606 44609 44621 44624 44626-44627 44631-44632 44661 44684-44685 44688-44690 44692 44704 44706 44711-44712 44717-44719 44722-44723 44732 44762 44770-44774 44780 44782 44784 44804-44805 44807 44812 44814 44816 44818 44821 44823 44832-44833 44836 44852 44854 44857 44860 44864-44866 44894-44895 44903 44909 44914-44915 44925 45133 45153 45155 45172 45174-45175 45201-45203 45212-45213 45215 45217-45220 45222 45225 45242-45243 45250-45251 45253-45254 45260 45262 45264-45265 45276-45277 45279 45388 45414-45415 45426-45427 45438-45439 45460-45462 45472-45473 45475 45487 45510 45516 45520-45521 45523-45525 45530-45531 45534 45556 45558-45559 45575 45581 45592-45593 45595 45598 45613-45615 45617 45619-45620 45622 45624 45626 45635 45638 45641 45643-45644 45646 45655 45657 45659 45693 45695-45696 45698 45704 45706-45707 45709 45711 45724 45726 45732-45733 45735 45738 45741 45743 45748 45752 45754-45756 45758 45767 45773 45781 45784-45785 45827 45830 45836 45838 45840 45845 45847 45853 45858-45859 45862-45863 45868-45870 45877 45879-45881 45885 45896-45897 45899 45924-45925 45927-45929 45933 45944-45945 45947 45956 45958 45960-45961 45963-45964 45967 45987 45990-45991 45993 45995 46000 46002 46006-46008 46010-46011 46019 46025 46036-46037 46040-46042 46053 46055 46058-46059 46061-46063 46079 46081 46084-46085 46087 46093 46100 46102-46105 46108-46109 46152 46160 46239 46242 46248 46250 46262-46263 46284 46286 46304-46306 46312 46340-46341 46352 46592 46594 46604 46606 46640 46642 46652 46654 46720-46721 46724-46725 46729-46732 46734-46737 46739 46745-46747 46756 46758-46761 46764 46769 46771 46777 46780-46781 46786-46787 46790 46796 46825-46828 46830 46842-46843 46846 47018-47019 47022 47061 47063 47069 47104 47106-47107 47109-47114 47124 47126 47143 47149-47151 47154 47157 47159 47174-47175 47178-47181 47186 47215 47219 47226 47228 47232-47234 47238-47239 47248-47249 47251 47260-47261 47264-47265 47268-47269 47271 47284 47286 47301 47303 47309 47312 47314 47319 47322 47325 47327 47331 47340-47342 47364 47374-47377 47379 47386-47387 47393-47395 47401 47404 47406-47407 47420 47422-47423 47428 47430 47432-47433 47436 47441-47443 47448-47450 47452 47457-47460 47462 47465-47467 47476 47478 47481-47486 47489-47494 47501-47503 47509-47512 47514-47515 47520-47522 47540 47542 47547 47549-47554 47557 47559 47562-47563 47565-47567 47588 47590 47596 47598-47601 47609 47611 47628-47629 47631-47632 47634-47635 47656 47658-47659 47661 47668-47670 47675 47688 47690-47691 47694 47696-47697 47699-47700 47702-47703 47705 47707-47710 47716 47719 47725 47732 47734 47736-47737 47740-47741 47743 47764-47766 47774-47775 47780 47782 47784-47786 47792-47793 47809 47811 47817-47822 47825 47827 47844 47846-47847 47858 47863-47864 47866-47867 47869-47871 47888-47889 47892 47919 47930-47931 47940-47941 47953 47956 47959 47965 48000 48005 48007 48011 48014-48018 48021-48023 48026-48027 48046-48047 48053-48055 48060-48062 48076 48078-48079 48083 48086 48089-48091 48112 48114 48126-48127 48156 48158 48162-48163 48166-48169 48171 48184-48186 48196 48198 48204 48206 48212 48214 48223 48226-48227 48230 48236 48249 48252-48253 48255 48260 48262 48265-48268 48270 48278-48279 48288-48289 48292 48294-48295 48300-48301 48306 48312 48322 48328 48388 48390 48393-48395 48420-48421 48423 48429 48440-48441 48444-48445 48478-48479 48491 48509-48511 48585 48588-48589 48592 48594-48595 48597 48599-48601 48605 48607 48642 48648 48684 48696-48697 48810-48811 48893 48895 48918-48919 48949-48950 48952-48953 48956 48962-48963 48966-48967 48978 48984 48992-48993 49043 49046 49048-49049 49051-49052 49054 49064 49066-49067 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/500/4849?format=ascii default J/MNRAS/500/4849/emigalah Catalogue of all analysed objects recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR2 ? Gaia DR2 identifier, source_id meta.id nullable GALAH GALAH unique per observation id meta.id;meta.main RAJ2000 Right ascension from 2MASS (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination from 2MASS (J2000) deg pos.eq.dec;meta.main indexed EWHa H{alpha} equivalent width of a difference between observed and template spectrum 0.1nm spect.line.eqWidth;arith.diff double EWHb H{beta} equivalent width of a difference between observed and template spectrum 0.1nm spect.line.eqWidth;arith.diff double EWHaabs H{alpha} equivalent width of an absolute difference between observed and template spectrum 0.1nm spect.line.eqWidth;arith.diff double EWHbabs H{beta} equivalent width of an absolute difference between observed and template spectrum 0.1nm spect.line.eqWidth;arith.diff double EWHaW10 Width of the H{alpha} emission feature at 10% of its peak flux amplitude km/s spect.line.eqWidth double EWHaasym Value of asymmetry index for the H{alpha} line spect.line.eqWidth double EWHbasym Value of asymmetry index for the H{beta} line spect.line.eqWidth double SB2-c3 [False True] Binarity detection in red arm meta.code char SB2-c1 [False True] Binarity detection in blue arm meta.code char NII [0-2] Number of detected [NII] peaks meta.number int SII [0-2] Number of detected [SII] peaks meta.number int EWNII Equivalent width of a fitted Gaussian profiles to the [NII] emission features 0.1nm spect.line.eqWidth;meta.modelled double EWSII Same as the NII_EW, but for the [SII] doublet 0.1nm spect.line.eqWidth double RVNII Intrinsic radial velocity of the [NII] doublet in the barycentric frame (1) km/s phys.veloc;pos.heliocentric double RVSII Same as rv_NII, but for the [SII] doublet km/s phys.veloc;pos.heliocentric double Nebular [0/1] Is spectrum considered to have an additional nebular component (1=True) meta.code int Emiss [0/1] Is spectrum considered to have an additional H{alpha} emission component (1=True) meta.code int Flag Sum of all raised bitwise flags for a spectrum (2) meta.code.error int