J/A+A/615/A6ivo://CDS.VizieR/J/A+A/615/A6doi:10.26093/cds/vizier.36150006CDSPassegger V.M.Reiners A.Jeffers S.V.Wende-von Berg S.Schaefer P.,Caballero J.A.Schweitzer A.Amado P.J.Bejar V.J.S.,Cortes-Contreras M.Hatzes A.P.Kuerster M.Montes D.Pedraz S.,Quirrenbach A.Ribas I.Seifert W.2019-10-10T15:45:03Z2018-07-03T07:23:50ZCDS support team

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

cds-question@unistra.frm-starsmetallicityeffective-temperaturespectroscopystellar-massesThe new CARMENES instrument comprises two high-resolution and high-stability spectrographs that are used to search for habitable planets around M dwarfs in the visible and near-infrared regime via the Doppler technique. Characterising our target sample is important for constraining the physical properties of any planetary systems that are detected. The aim of this paper is to determine the fundamental stellar parameters of the CARMENES M-dwarf target sample from high-resolution spectra observed with CARMENES. We also include several M-dwarf spectra observed with other high-resolution spectrographs, that is CAFE, FEROS, and HRS, for completeness. We used a {chi}^2^ method to derive the stellar parameters effective temperature T_eff, surface gravity log g, and metallicity [Fe/H] of the target stars by fitting the most recent version of the PHOENIX-ACES models to high-resolution spectroscopic data. These stellar atmosphere models incorporate a new equation of state to describe spectral features of low-temperature stellar atmospheres. Since Teff, logg, and [Fe/H] show degeneracies, the surface gravity is determined independently using stellar evolutionary models. We derive the stellar parameters for a total of 300 stars. The fits achieve very good agreement between the PHOENIX models and observed spectra. We estimate that our method provides parameters with uncertainties of {sigma}_Teff_=51K, {sigma}_logg_=0.07, and {sigma}_[Fe/H]_=0.16, and show that atmosphere models for low-mass stars have significantly improved in the last years. Our work also provides an independent test of the new PHOENIX-ACES models, and a comparison for other methods using low-resolution spectra. In particular, our effective temperatures agree well with literature values, while metallicities determined with our method exhibit a larger spread when compared to literature results.2018A&A...615A...6Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/615/A6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/577/A128 : CARMENES input catalog of M dwarfs I (Alonso-Floriano+, 2015)J/A+A/597/A47 : CARMENES input catalog of M dwarfs II (Cortes-Contreras+ 2017)J/A+A/609/A117 : CARMENES radial velocity curves of 7 M-dwarf (Trifonov+, 2018)J/A+A/609/L5 : CARMENES radial velocity curves of HD147379 b (Reiners+, 2018)J/A+A/612/A49 : 324 CARMENES M dwarfs velocities (Reiners+, 2018)J/A+A/614/A122 : Radial-velocity of CARMENES M dwarfs (Tal-Or+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/615/A6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/615/A6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/615/A6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/615/A6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/615/A6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/615/A6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/615/A6/tablea1 (Basic astrophysical parameters of investigated M dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/615/A6/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/615/A6/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/615/A6/tablea1?GETtext/xml+votable180.050000true1.093832845.69680320.0055555555555555566/115 137 313 499 574 624 727 811 1033 1460 1672 1739 1822 1875 1917 1938 2515 2546 2681 2737 2739 2747 3031 3266 3345 3425 3460 3639 3680 3714 3791 4033 4104 4144 4157 4250 4366 4423 4672 5009 5041 5207 5343 5420 5488 5534 5590 5849 6384 6552 6661 6676 7003 7157 7262 7266 7430 7471 7611 7625 7774 7837 7939-7940 8023 8032 8123 8210 8240 8394 8551 8733 8865 8915 9190 9529 9578 9597 10004 10037 10149 10225 10278 10448 10464-10465 10694 10901 11177 11255 11403 11671 11962 12128 12191 12621 12732 12849 12865 12890 13085 13567 13688 13875 14277 14395 14515 14709 14850 14985 14992 14994 15052 15078 15346 15412 15431 15598 15602 15635 15763 15792 15960 16758 17020 17271 17355 17409 17835 17870 17954 18195 18270 18295 18440 18496 18553 18666 18783 18789 18929 18942 18970 19050 19064 19130 19306 19341 19360 19513 19751 19878 19998 20023 20102 20109 20238 20311 20459 20725 20795 20803 21151 21171 21433 21746 21748 21777 21838 21955 21969 22222 22277 22309 22349 22490 22626 22813 23363 23453 23642 23718 23731 23735 23952 23997 24084 24103 24209 24213 24227 24239 24358 24995 25009 25363 25385 25398 25512 25517 25546 25989 26076 26394 26538 26560 26563 26581 26583 26730 26757 26772 26821 26974 27201 27260 27291 27394 27465 27519 27594 27736 27740 27820 27914 28309 28341 28343 28548 28646 29146 29159 29374 29684 30105 30331 30345 30387 30392 30429 30490 30505 30522 30771 30833 30893 31011 31197 31228 31357 31642 31692 31781 31811 31813 31994 32033 32036 32052 32076 32093 32114 32259 32335 32392 32436 32458 32491 36511 36582 36609 36658 36732 40336 40359 40436 40505 40610 40820 44541 44717 44920 44936 44973 48486 48906 48935 48958 49007 49100https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/615/A6?format=asciidefaultJ/A+A/615/A6/tablea1Basic astrophysical parameters of investigated M dwarfsSimbadNameSimbad column added by the CDSmeta.idcharTeffEffective temperature (1)Kphys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKarmnCarmencita identifiermeta.idcharNameStar namemeta.id;meta.maincharGJGJ numbermeta.idcharRAJ2016Right Ascension (J2016 )pos.eq.ra;meta.mainDEJ2016Declination (J2016)pos.eq.dec;meta.mainSpTypeMK spectral typesrc.spTypecharloggSurface gravity (1)log(cm.s**-2)phys.gravityfloat[Fe/H]Metallicity (1)phys.abund.Zfloatf_vsiniUpper limit flag for rotational velocitymeta.codecharvsiniRotational velocitykm/sphys.veloc.rotatfloatMass? Stellar masssolMassphys.massfloatnullablef_CaII[0/1] Flag for Ca II IRT emission; 1 if emission visiblemeta.codeintInstInstrument used for observations (2)instr.setupcharRefBibcode of reference to vsini, in refs.dat filemeta.bib.bibcodechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexedJ/A+A/615/A6/refsReferencesBibCodeBibCodemeta.bib.bibcodecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharTitleTitle of the papermeta.bibchar