J/A+A/702/A9ivo://CDS.VizieR/J/A+A/702/A9CDSKrticka J.Kubat J.Krtickova I.2025-12-01T06:24:56Z2025-09-26T10:07:46ZCDS support team

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

cds-question@unistra.frastronomical-modelsstellar-atmosphereso-starsstellar-mass-lossWe provide new line-driven wind models for OB stars with metallicities down to 0.0 Zo. The models were calculated with our global wind code METUJE, which solves the hydrodynamical equations from nearly hydrostatic photosphere to supersonically expanding stellar wind together with the equations of statistical equilibrium and radiative transfer equation. The models predict the basic wind parameters, namely the wind mass-loss rates and terminal velocities just from the stellar parameters. In general, the wind mass-loss rates decrease with decreasing metallicity and this relationship steepens for very low metallicities Z<0.1Zo. Down to metallicities corresponding to the Magellanic Clouds and even lower, the predicted mass-loss rates reasonably agree with observational estimates. However, the theoretical and observational mass-loss rates for very low metallicities exhibit significant scatter. We show that the scatter of observational values can be caused by inefficient shock cooling in the stellar wind, which leaves a considerable fraction of the wind at too high temperatures with waning observational signatures. The scatter of theoretical predictions is caused by a low number of lines that effectively accelerate the wind at very low metallicities.2025A&A...702A...9Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A9CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/606/A31 : METUJE wind models of O stars from our Galaxy (Krticka+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/702/A9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/702/A9/table1Adopted parameters of the model grid of B starsMStellar masssolMassphys.massintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintModelModel namemeta.id;stat.param;meta.modelledcharTeffStellar effective temperaturekKphys.temperature.effectivefloatR*Stellar radiussolRadphys.size.radiusfloatFilestName of the subdirectory bt with model resultsmeta.id;stat.param;meta.modelledcharVinftPredicted terminal velocity for Zo/10km/sphys.velocintdM/dttPredicted mass-loss rate for Zo/10solMass/yrphys.mass.lossdoubleFilesvName of the subdirectory bv with model resultsmeta.id;stat.param;meta.modelledcharVinfv? Predicted terminal velocity for Zo/30km/sphys.velocintnullabledM/dtv? Predicted mass-loss rate for Zo/30solMass/yrphys.mass.lossdoublenullableFilesxName of the subdirectory bx with model resultsmeta.id;stat.param;meta.modelledcharVinfx? Predicted terminal velocity for Zo/100km/sphys.velocintnullabledM/dtx? Predicted mass-loss rate for Zo/100solMass/yrphys.mass.lossdoublenullableJ/A+A/702/A9/table2Adopted parameters of the model grid of O starsFilesxName of the subdirectory ox with model resultsmeta.id;stat.param;meta.modelledcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeStar typesrc.classcharModelModel namemeta.id;stat.param;meta.modelledcharTeffStellar effective temperatureKphys.temperature.effectiveintR*Stellar radiussolRadphys.size.radiusfloatMStellar masssolMassphys.massfloatlogLStellar luminositylog(solLum)phys.luminosityfloatGammaEddington parameterstat.fit.paramfloatFilestName of the subdirectory ot with model resultsmeta.id;stat.param;meta.modelledcharVinftPredicted terminal velocity for Zo/10km/sphys.velocintdM/dttPredicted mass-loss rate for Zo/10solMass/yrphys.mass.lossdoubleFilesvName of the subdirectory ov with model resultsmeta.id;stat.param;meta.modelledcharVinfvPredicted terminal velocity for Zo/30km/sphys.velocintdM/dtvPredicted mass-loss rate for Zo/30solMass/yrphys.mass.lossdoubleVinfx? Predicted terminal velocity for Zo/100km/sphys.velocintnullabledM/dtx? Predicted mass-loss rate for Zo/100solMass/yrphys.mass.lossdoublenullable