J/AJ/125/2621ivo://CDS.VizieR/J/AJ/125/2621doi:10.26093/cds/vizier.51252621CDSRaymond S.N.Szkody P.Hawley S.L.Anderson S.F.Brinkmann J.,Covey K.R.Mcgehee P.M.Schneider D.P.West A.A.York D.G.2023-04-06T16:50:55Z2016-11-10T12:31:45ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsvisible-astronomysloan-photometryWe have identified 109 white dwarf (WD)-M dwarf pairs in the Sloan Digital Sky Survey (SDSS) with g<20th magnitude. For each system we determined the temperature of the WD primary and the spectral type of the M dwarf secondary. Using H{alpha} emission as a proxy for the chromospheric activity level of the M dwarf, we investigated correlations between the activity level and properties of the system. Compared with field M dwarfs previously observed in the Palomar/MSU Survey, we see a slightly higher active fraction of early-type stars, with activity levels similar to the field. We have conducted follow-up observations at the ARC 3.5m telescope to obtain radial velocity information and to search for short-period binaries that may be on the verge of interacting. We report on one system with a 4.1hr period and several additional systems with significant velocity variations.2003AJ....125.2621Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/125/2621CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/125/2621https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/125/2621http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/125/2621https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/125/2621https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/125/2621http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/125/2621GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/125/2621/table1 (WD-M binary parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2621/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2621/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2621/table1?GETtext/xml+votable180.050000true4.3609583-0.41427780.0055555555555555566/2 527 6537 6560 6563 6577-6578 7270 7272 7286 7320 7468 7507 7513 7528 8193 8207 9530 9609 9639 9949 10085 10092-10093 10095 10177 10189 10215 10223 10226-10227 10232 11351 11506 11589 11855 12557 17756 17765 17813 17815 17820 17827 17858 18019 18024 18072 18084-18085 18087 18178 18413 18777-18779 18882 19036 21852 23053 23124 23183 23192 23194-23196 23208-23209 25848 25933 25947 25949 26007 26031 26051 26165 26222 26255 26263 26275 26959 26966 26971 26978-26979 26987-26988 26995 27035 27046 27218 27226 27248 27290 27335 27655 31345 31387 31403-31404 31438 36794 36804 36809 368133.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/125/2621?format=asciiOpticaldefaultJ/AJ/125/2621/table1WD-M binary parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSloan Digital Sky Survey designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharf_SDSSFlag on SDSS (1)meta.codechargmagThe SDSS g-band magnitudemagphot.mag;em.opt.Bfloatu-gThe SDSS (u-g) color indexmagphot.color;em.opt.U;em.opt.Bfloatg-rThe SDSS (g-r) color indexmagphot.color;em.opt.B;em.opt.Rfloatr-iThe SDSS (r-i) color indexmagphot.color;em.opt.R;em.opt.Ifloati-zThe SDSS (i-z) color indexmagphot.color;em.opt.I;em.opt.IfloatTeffWhite dwarf primary effective temperature (2)Kphys.temperature.effectiveintMTypeSecondary M spectral type (3)src.spTypefloatDistDistance (4)pcpos.distance;pos.heliocentricintEWHaH{alpha} equivalent width in Angstroems0.1nmspect.line.eqWidth;em.line.HalphafloatSloanDisplay the online SDSS data for this starmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main