J/A+A/628/A61ivo://CDS.VizieR/J/A+A/628/A61doi:10.26093/cds/vizier.36280061CDSLodieu N.Allard F.Rodrigo C.Pavlenko Y.Burgasser A.Lyubchik Y.,Kaminsky B.Homeier D.2021-01-08T16:48:24Z2019-08-08T07:33:16ZCDS support team

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

cds-question@unistra.frlate-type-starsspectroscopyultraviolet-astronomyvisible-astronomyinfrared-astronomyThe aim of the project is to define metallicity/gravity/temperature scales for different spectral types of metal-poor M dwarfs. We obtained intermediate-resolution ultraviolet (UVB), optical (VIS), and near-infrared (NIR) spectra of 43 metal-poor M dwarfs (16 sdMs, 16 esdMs, and 12 usdMs with the ESO VLT X-shooter spectrograph. We compared our atlas of spectra to the BT-Settl synthetic spectral energy distribution over a wide range of metallicities, gravities, and effective temperatures to infer the physical properties for the whole M dwarf sequence at sub-solar metallicities and constrain the latest atmospheric models. The BT-Settl models accurately reproduce the observed spectra across the 450--2500 nm wavelength range except for a few regions. We find that the best fits for gravities of log(g)=5.0-5.5 for the three metal classes. We infer metallicities of [Fe/H]=-0.5, -1.5, and -2.0+/-0.5dex and effective temperatures of 3700-2600K, 3800-2900K, and 3700-2900K for sdMs, esdMs, and usdMs, respectively.2019A&A...628A..61Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/628/A61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/628/A61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/628/A61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/628/A61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/628/A61https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/628/A61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/628/A61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/628/A61/table1 (Logs of the VLT/X-shooter spectroscopic observations of M subdwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/628/A61/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/628/A61/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/628/A61/table1?GETtext/xml+votable180.050000true356.7494583-0.99552780.0055555555555555566/544 4157 4661 8273 8278 8294 8343 9244 16894 17406 17513 17551 17778 17858 18009 18024 18026 18071 18097 18381 18765 18770 18775 18793 19120 20010 20672 21123 23192 23194 23232 26026 26102 26142 26154 26667 27423 27853 27909 30037 31309 31434 31488https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/628/A61?format=asciiUVOpticalInfrareddefaultJ/A+A/628/A61/table1Logs of the VLT/X-shooter spectroscopic observations of M subdwarfsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maini'magSloan i' magnitudemagphot.mag;em.opt.IfloatSpTypeSpectral type the SDSS spectroscopic databasesrc.spTypecharObs.DateDate of the VLT X-shooter at the beginning of the observationtime.epochnullableAirmAirmass at the beginning of the observationobs.airMassfloatExpTUUVB arm exposure timestime.duration;obs.exposureintExpTVVIS arm exposure timestime.duration;obs.exposureintExpTNNIR arm exposure timestime.duration;obs.exposureintCyclenumbers of AB cycles (identical for all arms)meta.numbercharspShow the spectrummeta.ref.urlcharFileNameName of the spectrum file in subdirectory spmeta.id;meta.filechar