J/A+A/675/A154ivo://CDS.VizieR/J/A+A/675/A154doi:10.26093/cds/vizier.36750154CDSVink J.S.Mehner A.Crowther P.A.Fullerton A.Garcia M.Martins F.,Morrell N.Oskinova L.M.St-Louis N.ud-Doula A.Sander A.A.C.,Sana H.Bouret J.-C.Kubatova B.Marchant P.Martins L.P.Wofford A.,van Loon J.T.Grace Telford O.Goetberg Y.Bowman D.M.Erba C.,Kalari V.M.Abdul-Masih M.Alkousa T.Backs F.Barbosa C.L.,Berlanas S.R.Bernini-Peron M.Bestenlehner J.M.Blomme R.,Bodensteiner J.Brands S.A.Evans C.J.David-Uraz A.Driessen F.A.,Dsilva K.Geen S.Gomez-Gonzalez V.M.A.Grassitelli L.Hamann W.-R.,Hawcroft C.Herrero A.Higgins E.R.John Hillier D.Ignace R.,Istrate A.G.Kaper L.Kee N.D.Kehrig C.Keszthelyi Z.Klencki J.,de Koter A.Kuiper R.Laplace E.Larkin C.J.K.Lefever R.R.,Leitherer C.Lennon D.J.Mahy L.Maiz Apellaniz J.Maravelias G.,Marcolino W.McLeod A.F.de Mink S.E.Najarro F.Oey M.S.,Parsons T.N.Pauli D.Pedersen M.G.Prinja R.K.Ramachandran V.,Ramirez-Tannus M.C.Sabhahit G.N.Schootemeijer A.Reyero Serantes S.,Shenar T.Stringfellow G.S.Sudnik N.Tramper F.Wang L.2024-11-06T20:04:56Z2023-07-19T07:34:55ZCDS support team

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

cds-question@unistra.frearly-type-starsvisible-astronomybroad-band-photometryinfrared-photometryeffective-temperaturestellar-radiistellar-massesObservations of individual massive stars, super-luminous supernovae, gamma-ray bursts, and gravitational wave events involving spectacular black hole mergers indicate that the low-metallicity Universe is fundamentally different from our own Galaxy. Many transient phenomena will remain enigmatic until we achieve a firm understanding of the physics and evolution of massive stars at low metallicity (Z). The Hubble Space Telescope has devoted 500 orbits to observing ~250 massive stars at low Z in the ultraviolet (UV) with the COS and STIS spectrographs under the ULLYSES programme. The complementary X-Shooting ULLYSES (XShootU) project provides an enhanced legacy value with high-quality optical and near-infrared spectra obtained with the wide-wavelength coverage X-shooter spectrograph at ESO's Very Large Telescope. We present an overview of the XShootU project, showing that combining ULLYSES UV and XShootU optical spectra is critical for the uniform determination of stellar parameters such as effective temperature, surface gravity, luminosity, and abundances, as well as wind properties such as mass-loss rates as a function of Z. As uncertainties in stellar and wind parameters percolate into many adjacent areas of astrophysics, the data and modelling of the XShootU project is expected to be a game changer for our physical understanding of massive stars at low Z. To be able to confidently interpret James Webb Space Telescope spectra of the first stellar generations, the individual spectra of low-Z stars need to be understood, which is exactly where XShootU can deliver.2023A&A...675A.154Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/675/A154CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/675/A154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/675/A154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/675/A154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/675/A154https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/675/A154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/675/A154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/675/A154/tableb1 (Photometric, spectroscopic and multiplicity of ULLYSES/XShootU targets, ordered by RA)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/675/A154/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/675/A154/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/675/A154/tableb1?GETtext/xml+votable180.050000true9.242625-73.39252780.0055555555555555565/8274-8275 8280 6/26858 32958 33047 33051-33054 33076-33077 33079 33091-33092 33094-33095 33106-33107 33112-33113 33115-33116 33124 33126-33128 33294-33295 33297-33299 33304 33306 33316-33317 33328 33330 388467.952274030004205e-20 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/675/A154?format=asciiOpticalInfrareddefaultJ/A+A/675/A154/tableb1Photometric, spectroscopic and multiplicity of ULLYSES/XShootU targets, ordered by RASimbadNameSimbad column added by the CDSmeta.idcharnullableClusterCluster namemeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget namemeta.id;meta.maincharAliasOther name(s)meta.idcharSpTypeSpectral typesrc.spTypecharr_SpTypeReference for spectral typemeta.ref;pos.frameintUmag? U magnitudemagphot.mag;em.opt.UfloatnullableBmag? B magnitudemagphot.mag;em.opt.BfloatnullableVmagV magnitudemagphot.mag;em.opt.Vfloatr_UmagReference for UBV magnitudesmeta.ref;pos.framecharJmag? J magnitude (1)magphot.mag;em.IR.JfloatnullableHmag? H magnitude (1)magphot.mag;em.IR.HfloatnullableKsmag? Ks magnitude (1)magphot.mag;em.IR.Kfloatnullabler_JmagReference for JHKs magnitudesmeta.ref;pos.framechar(B-V)0? Dereddened B-V colourmagphot.color;em.opt.B;em.opt.VfloatnullableE(B-V)? Reddeningmagphot.color.excessfloatnullabler_(B-V)0Reference for Reddeningmeta.ref;pos.frameintVMAG? Absolute magnitudemagphys.magAbsfloatnullableBinary?Binary codemeta.codecharr_Binary?Referrence for Binary codemeta.ref;pos.framecharMIKE?[V] V for Magellan/MIKE targetmeta.codechar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainJ/A+A/675/A154/refb1References for table B1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/A+A/675/A154/tableb2Pre-ULLYSES target parameters compiled by the ULLYSES team at STScIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharTargetTarget namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypecharr_SpTypeReference for spectral typemeta.ref;pos.frameintTeff? Effective temperatureKphys.temperature.effectiveintnullabler_Teff? Reference for Teffmeta.ref;pos.frameintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullabler_logg? Reference for loggmeta.ref;pos.frameintnullablelogL? Luminositylog(solLum)phys.luminosityfloatnullabler_logL? Reference for logLmeta.refintnullableRad? RadiussolRadphys.size.radiusfloatnullabler_RadReference for Radmeta.ref;pos.framecharMass? MasssolMassphys.massfloatnullabler_Mass? Reference for Massmeta.refintnullablevsini? Rotational velocitykm/sphys.veloc.rotatintnullabler_vsini? Reference for vsinimeta.refintnullablevinf? Terminal velocitykm/sphys.velocintnullabler_vinf? Reference for vinfmeta.ref;pos.frameintnullabledM/dt? Mass losssolMass/yrphys.mass.lossdoublenullabler_dM/dt? Reference for dM/dtmeta.ref;pos.frameintnullableJ/A+A/675/A154/refb2References for table B2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar