J/A+A/695/A227ivo://CDS.VizieR/J/A+A/695/A227doi:10.26093/cds/vizier.36950227CDSMulato L.Merc J.Charbonnel S.Garde O.Le Du P.Petit T.2025-05-21T20:02:43Z2025-03-21T10:23:02ZCDS support team

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

cds-question@unistra.frwolf-rayet-starsearly-type-starsvisible-astronomyspectroscopyGaia DR3, released in June 2022, included low-resolution XP spectra that have been used for the classification of various types of emission-line objects through machine-learning techniques. The Gaia Extended Stellar Parametrizer for Emission-Line Stars (ESP-ELS) algorithm identified 565 sources as potential Wolf-Rayet (WR) stars. Over half of them were already known as WR stars in the Milky Way and Magellanic Clouds. We utilized Gaia DR3 data to identify new Galactic WR stars. We extracted all sources classified as WC or WN type stars by the ESP-ELS algorithm from the Gaia catalog. By applying judicious 2MASS color selection criteria, leveraging Gaia H{alpha} measurements, and filtering out objects already cataloged in various databases, we selected 37 bright candidates (G<=16mag) and 22 faint candidates (G>16mag). Spectroscopic follow-up observations of these candidates were conducted using the 2SPOT facilities in Chile and France, as well as 1-m C2PU's Epsilon telescope at the Calern Observatory. This paper focuses on the brighter sample. Among the 37 targets, we confirmed 17 and 16 new Galactic WC and WN type WR stars, respectively. Three of them were recently reported as new WR stars in an independent study. The Gaia mission provides a valuable resource for uncovering WR stars missed in earlier surveys. While this work concentrated on a relatively small starting sample provided by the ESP-ELS algorithm, our findings highlight the potential for refining selection criteria to identify additional candidates not included in the outputs of the algorithm. Furthermore, the observation program underscores the utility of small telescopes in acquiring initial spectral data for sources with magnitudes up to G~16mag.2025A&A...695A.227Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A227CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A227https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A227http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A227https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A227https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A227http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A227GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/695/A227/list (List of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A227/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A227/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A227/list?GETtext/xml+votable180.050000true25.13734618436400263.706379984828320.0055555555555555566/3644 12970 14709 15374 15438 15460 15653 22250 23969 28802 28808 28924-28925 29094 29507 29525 29528 30223 30244 30246 30259 30270 30340 30418 30628 30719 37365 37713 37904 41649 41678 41756 41805 42199 42404 42441https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A227?format=asciiOpticaldefaultJ/A+A/695/A227/listList of spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRSRight Ascension of center (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainDE_ICRSDeclination of center (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableblambdaLower value of wavelength interval0.1nmem.wlfloatBlambdaUpper value of wavelength interval0.1nmem.wlfloatdlambdaWavelength resolution0.1nmspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharGaiaDR3Display the Gaia DR3 data ((Gaia Coll., 2022, Cat. I/355)meta.ref.urlchar