J/A+A/642/A57ivo://CDS.VizieR/J/A+A/642/A57doi:10.26093/cds/vizier.36420057CDSCalissendorff P.Janson M.Bonnefoy M.2021-01-05T10:44:16Z2020-10-07T08:17:54ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-sourcesinfrared-astronomyspectroscopyWe present the results from an integral field spectroscopy study of seven close visual binary pairs of young M-dwarf multiple systems. The target systems are part of the astrometric monitoring AstraLux program, surveying hundreds of M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital constraints. Our new VLT/SINFONI data provides resolved spectral type classification in the J, H and K bands for seven of these low-mass M-dwarf binaries, which we determine by comparing them to empirical templates and examining the strength of water absorption in the K-band. The medium resolution K-band spectra also allows us to derive effective temperatures for the individual components. All targets in the survey display several signs of youth, and some have kinematics similar to young moving groups, or low surface gravities which we determine from measuring equivalent widths of gravity sensitive alkali lines in the J-band. Resolved photometry from our targets is also compared with isochrones from theoretical evolutionary models, further implying young ages. Dynamical masses will be provided from ongoing monitoring of these systems, which can be seen as emblematic binary benchmarks that may be used to calibrate evolutionary models for low-mass stars in the future.2020A&A...642A..57Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/642/A57CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/642/A57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/642/A57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/642/A57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/642/A57https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/642/A57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/642/A57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/642/A57/list (List of VLT/SINFONI spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/642/A57/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/642/A57/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/642/A57/list?GETtext/xml+votable180.050000true17.855916715.43930560.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/642/A576/850 19777 20262 22830 27611 36978 37418https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/642/A57?format=asciiInfrareddefaultJ/A+A/642/A57/listList of VLT/SINFONI spectraANameAlternative namemeta.idcharAirmassAirmass (1)obs.airMassfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName2MASS namemeta.id;meta.maincharm_Name[ABC] Multiplicity index on Namemeta.code.multipcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainObs.DateObservation date (1)time.epoch;obsnullableExpTimeJExposure time in J band (1)stime.duration;obs.exposurecharExpTimeHKExposure time in H + K band (1)stime.duration;obs.exposurecharl_Airmass[~< ] Limit flag on Airmass (1)meta.code.error;obs.airMasscharSpTypeTelluric STD spectral type (1)src.spTypecharspShow the spectrummeta.ref.urlcharFileNameName of the fits spectrum in subdirectory fitsmeta.id;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar