H{alpha}-excess S-PLUS Catalogs J/A+A/695/A104 ivo://CDS.VizieR/J/A+A/695/A104 doi:10.26093/cds/vizier.36950104 CDS Gutierrez-Soto L.A. Lopes de Oliveira R. Akras S. Goncalves D.R.,Lomeli-Nunez L.F. Mendes de Oliveira C. Telles E. Alvarez-Candal A.,Borges Fernandes M. Daflon S. Ferreira Lopes C.E. Grossi M. Hazarika D.,Humire P.K. Lima-Dias C. Lopes A.R. Nilo Castellon J.L. Panda S.,Kanaan A. Ribeiro T. Schoenell W. 2025-05-21T20:02:24Z 2025-03-14T08:28:56Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys novae cataclysmic-variable-stars quasars emission-line-stars photometry visible-astronomy We use the Southern Photometric Local Universe Survey (S-PLUS) Fourth Data Release (DR4) to identify and classify H{alpha}-excess point source candidates in the Southern Sky. This approach combines photometric data from 12 S-PLUS filters with machine learning techniques to improve source classification and advance our understanding of H{alpha}-related phenomena. Our goal is to enhance the classification of H{alpha}-excess point sources by distinguishing between Galactic and extragalactic objects, particularly those with redshifted emission lines, and to identify sources where the H{alpha} excess is associated with variability phenomena, such as short-period RR Lyrae stars. We selected H{alpha}-excess candidates using the (r-J0660) versus (r-i) colour-colour diagram from the S-PLUS main survey (MS) and Galactic Disk Survey (GDS). Dimensionality reduction was achieved using UMAP, followed by HDBSCAN clustering. We refined this by incorporating infrared data, improving the separation of source types. A Random Forest model was then trained on the clustering results to identify key colour features for the classification of H{alpha}-excess sources. New, effective colour-colour diagrams were constructed by combining data from S-PLUS MS and infrared data. These diagrams, alongside tentative colour criteria, offer a preliminary classification of H{alpha}-excess sources without the need for complex algorithms. Combining multiwavelength photometric data with machine learning techniques significantly improved the classification of H{alpha}-excess sources. We identified 6956 sources with excess in the J0660 filter, and cross-matching with SIMBAD allowed us to explore the types of objects present in our catalog, including emission-line stars, young stellar objects, nebulae, stellar binaries, cataclysmic variables, variable stars, and extragalactic sources such as QSOs, AGNs, and galaxies. The cross-match also revealed X-ray sources, transients, and other peculiar objects. Using S-PLUS colours and machine learning, we successfully separated RR Lyrae stars from both other Galactic stars and extragalactic objects. Additionally, we achieved a clear separation between Galactic and extragalactic sources. However, distinguishing cataclysmic variables from QSOs at specific redshifts remained challenging. Incorporating infrared data refined the classification, enabling us to separate Galactic from extragalactic sources and to distinguish cataclysmic variables from QSOs. The Random Forest model, trained on HDBSCAN results, highlighted key colour features that distinguish the different classes of H{alpha}-excess sources, providing a robust framework for future studies such as follow-up spectroscopy. 2025A&A...695A.104G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A104 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/380 : S-PLUS DR4 photometrical catalog (Herpich+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A104 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A104 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A104 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A104 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A104 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A104 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/695/A104/hasms (Main survey H{alpha}-excess sources with UMAP/WISE) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A104/hasms? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A104/hasms? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A104/hasms? GET text/xml+votable 180.0 50000 true 151.2280651 -24.5658805 0.005555555555555556 Cone search capability for table J/A+A/695/A104/hasgds (Galactic Disk Survey H{alpha}-excess sources) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A104/hasgds? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A104/hasgds? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A104/hasgds? 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48377 48380-48381 48383 48404-48405 48440-48441 48444 48448-48449 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A104?format=ascii Optical default J/A+A/695/A104/hasms Main survey H{alpha}-excess sources with UMAP/WISE e_zmag Error in zmag mag stat.error;phot.mag double recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Unique source identifier, iDR4_3_* meta.id;meta.main char RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main umag S-PLUS u-band PStotal magnitude mag phot.mag;em.opt.U double e_umag Error in u-band magnitude mag stat.error;phot.mag double J0378mag S-PLUS J0378 PStotal magnitude mag phot.mag;em.opt double e_J0378mag Error in J0378mag mag stat.error;phot.mag double J0395mag S-PLUS J0395 PStotal magnitude mag phot.mag;em.opt double e_J0395mag Error in J0395mag mag stat.error;phot.mag double J0410mag S-PLUS J0410 PStotal magnitude mag phot.mag;em.opt double e_J0410mag Error in J0410mag mag stat.error;phot.mag double J0430mag S-PLUS J0430 PStotal magnitude mag phot.mag;em.opt double e_J0430mag Error in J0430mag mag stat.error;phot.mag double gmag S-PLUS g-band PStotal magnitude mag phot.mag;em.opt.B double e_gmag Error in gmag mag stat.error;phot.mag double J0515mag S-PLUS J0515 PStotal magnitude mag phot.mag;em.opt double e_J0515mag Error in J0515mag mag stat.error;phot.mag double rmag S-PLUS r-band PStotal magnitude mag phot.mag;em.opt.R double e_rmag Error in rmag mag stat.error;phot.mag double J0660mag S-PLUS J0660 PStotal magnitude mag phot.mag;em.opt double e_J0660mag Error in J0660mag mag stat.error;phot.mag double imag S-PLUS i-band PStotal magnitude mag phot.mag;em.opt.I double e_imag Error in imag mag stat.error;phot.mag double J0861mag S-PLUS J0861 PStotal magnitude mag phot.mag;em.opt double e_J0861mag Error in J0861mag mag stat.error;phot.mag double zmag S-PLUS z-band PStotal magnitude mag phot.mag;em.opt.I double SimbadType SIMBAD classification (1) src.class char W1mag ? AllWISE W1 magnitude mag phot.mag;em.IR.3-4um double nullable e_W1mag ? Error in W1mag mag stat.error;phot.mag double nullable W2mag ? AllWISE W2 magnitude mag phot.mag;em.IR.4-8um double nullable e_W2mag ? Error in W2mag mag stat.error;phot.mag double nullable UMAP1-S ? UMAP axis 1 (S-PLUS only) stat.fit.param double nullable UMAP2-S ? UMAP axis 2 (S-PLUS only) stat.fit.param double nullable Class-S [0/4]? HDBSCAN class (S-PLUS) (2) src.class int nullable UMAP1-S+W ? UMAP axis 1 (S-PLUS+WISE) stat.fit.param double nullable UMAP2-S+W ? UMAP axis 2 (S-PLUS+WISE) stat.fit.param double nullable Class-S+W [-1/4]? HDBSCAN class (S-PLUS+WISE) (3) src.class int nullable
J/A+A/695/A104/hasgds Galactic Disk Survey H{alpha}-excess sources recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Unique source identifier, GDS_dNNN_NNNNNN meta.id;meta.main char RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main umag ? S-PLUS u-band PSF-photometry magnitude mag phot.mag;em.opt.U double nullable e_umag ? Error in u-band magnitude mag stat.error;phot.mag double nullable J0378mag ? S-PLUS J0378 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0378mag ? Error in J0378mag mag stat.error;phot.mag double nullable J0395mag ? S-PLUS J0395 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0395mag ? Error in J0395mag mag stat.error;phot.mag double nullable J0410mag ? S-PLUS J0410 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0410mag ? Error in J0410mag mag stat.error;phot.mag double nullable J0430mag ? S-PLUS J0430 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0430mag ? Error in J0430mag mag stat.error;phot.mag double nullable gmag ? S-PLUS g-band PSF-photometry magnitude mag phot.mag;em.opt.B double nullable e_gmag ? Error in gmag mag stat.error;phot.mag double nullable J0515mag ? S-PLUS J0515 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0515mag ? Error in J0515mag mag stat.error;phot.mag double nullable rmag S-PLUS r-band PSF-photometry magnitude mag phot.mag;em.opt.R double e_rmag Error in rmag mag stat.error;phot.mag double J0660mag S-PLUS J0660 PSF-photometry magnitude mag phot.mag;em.opt double e_J0660mag Error in J0660mag mag stat.error;phot.mag double imag S-PLUS i-band PSF-photometry magnitude mag phot.mag;em.opt.I double e_imag Error in imag mag stat.error;phot.mag double J0861mag ? S-PLUS J0861 PSF-photometry magnitude mag phot.mag;em.opt double nullable e_J0861mag ? Error in J0861mag mag stat.error;phot.mag double nullable zmag S-PLUS z-band PSF-photometry magnitude mag phot.mag;em.opt.I double e_zmag Error in zmag mag stat.error;phot.mag double SimbadType SIMBAD classification (1) src.class char