J/AJ/157/63ivo://CDS.VizieR/J/AJ/157/63doi:10.26093/cds/vizier.51570063CDSKesseli A.Y.Kirkpatrick J.D.Fajardo-Acosta S.B.Penny M.T.,Gaudi B.S.Veyette M.Boeshaar P.C.Henderson C.B.Cushing M.C.,Calchi-Novati S.Shvartzvald Y.Muirhead P.S.2019-07-09T14:08:01Z2019-05-31T12:50:25ZCDS support team

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

cds-question@unistra.frm-starssubdwarf-starsdwarf-starsvisible-astronomysloan-photometryinfrared-photometryWide-band photometryeffective-temperaturestellar-radiimetallicityM subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller radii for a given effective temperature. We compile a sample of 88 stars that span spectral classes K7 to M6 and include stars with metallicity classes from solar-metallicity dwarf stars to the lowest metallicity ultra subdwarfs to test how metallicity changes the stellar radius. We fit models to Palomar Double Spectrograph (DBSP) optical spectra to derive effective temperatures (T_eff_) and we measure bolometric luminosities (L_bol_) by combining broad wavelength-coverage photometry with Gaia parallaxes. Radii are then computed by combining the T_eff_ and L_bol_ using the Stefan-Boltzman law. We find that for a given temperature, ultra subdwarfs can be as much as five times smaller than their solar-metallicity counterparts. We present color-radius and color-surface brightness relations that extend down to [Fe/H] of -2.0 dex, in order to aid the radius determination of M subdwarfs, which will be especially important for the WFIRST exoplanetary microlensing survey.2019AJ....157...63Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/157/63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)I/337 : Gaia DR1 (Gaia Collaboration, 2016)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)J/PASP/121/117 : Fe and Ti abundances of 12 low-metallicity M starsJ/A+A/564/A90 : M subdwarfs VLT/UVES high resolution spectraJ/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfsJ/other/RAA/16.G7 : Nearby M subdwarfs from LAMOST DR2 (Bai+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/157/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/157/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/157/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/157/63https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/157/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/157/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/157/63/table2 (Photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/157/63/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/157/63/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/157/63/table2?GETtext/xml+votable180.050000true125.640629217.00525860.0055555555555555566/8 250 265 380 590 806 811 1332 1570 1668 1672 1729 2368 2994 3715 4157 4333 4444 4554 4656 4661 5415 5420 6178 6346 6423 6784 7264 7516 7861 7867 8022 8685 8783 8867 9467 9472 9616 9723 10554 12807 13301 13952 13960 14248 14772 15071 15239 15530 16125 17268 17900 18592 19250 19466 19475 19555 19732 19777 19786 19932 20061 20896 22229 23518 23676 23884 24171 24213 24249 26154 26391 26437 26972 27392 27459 27462 27894 28030 28351 28472 28548 31019 36347 36679 40387 44564 44585 47078 48344 486698.157980699529898e-21 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/157/63?format=asciiOpticalInfrareddefaultJ/AJ/157/63/table2PhotometrySimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identifiermeta.id;meta.maincharprimarymoreindicates derived parameters in Table 3 for this starmeta.ref.urlcharumagSD[11.0806/24.4154]? Apparent SDSS u band magnitudemagphot.mag;em.opt.Ufloatnullablee_umagSD[0.0005/1.1093]? Uncertainty in umagSDmagstat.error;pos.cartesian.xfloatnullablegmagSD[8.6298/21.6095]? Apparent SDSS g band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmagSD[0.0001/1.086]? Uncertainty in gmagSDmagstat.errorfloatnullablegmagPS[14.255/21.15]? Apparent Pan-STARRS g band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmagPS[0.000293/0.034]? Uncertainty in gmagPSmagstat.errordoublenullableBmag[7.8828/20.1607]? Apparent Gaia blue band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.0012/0.0993]? Uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatnullablermagPS[13.861/19.275]? Apparent Pan-STARRS r band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmagPS[5.1e-05/0.015]? Uncertainty in rmagPSmagstat.errordoublenullablermagSD[7.0918/19.2307]? Apparent SDSS r band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmagSD[0/2.0723]? Uncertainty in rmagSDmagstat.errorfloatnullableimagPS[14.531/17.864]? Apparent Pan-STARRS i band magnitudemagphot.mag;em.opt.Ifloatnullablee_imagPS[0.000976/0.018]? Uncertainty in imagPSmagstat.errordoublenullableimagSD[6.4159/17.8655]? Apparent SDSS i band magnitudemagphot.mag;em.opt.Ifloatnullablee_imagSD[0/7.8301]? Uncertainty in imagSDmagstat.errorfloatnullableRmag[6.0594/17.4027]? Apparent Gaia red band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag[0.0006/0.054]? Uncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatnullablezmagPS[13.534/17.237]? Apparent Pan-STARRS z band magnitudemagphot.mag;em.opt.Ifloatnullablee_zmagPS[1.7e-05/0.02]? Uncertainty in ymagPSmagstat.errordoublenullablezmagSD[6.7336/17.1567]? Apparent SDSS z band magnitudemagphot.mag;em.opt.Ifloatnullablee_zmagSD[0.0001/1.0869]? Uncertainty in zmagSDmagstat.errorfloatnullableymagPS[12.622/16.964]? Apparent Pan-STARRS y band magnitudemagphot.mag;em.IR.Jfloatnullablee_ymagPS[9e-06/0.2]? Uncertainty in ymagPSmagstat.error;pos.cartesian.ydoublenullableJmag[5.449/15.827]? Apparent 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.018/0.079]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[5.282/15.539]? Apparent 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.016/0.117]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag[4.593/15.362]? Apparent 2MASS K_s_ band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.014/0.18]? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatnullableW1mag[4.042/14.997]? Apparent WISE 3.4 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.022/0.282]? Uncertainty in W1magmagstat.error;phot.magfloatnullableW2mag[3.318/14.754]? Apparent WISE 4.6 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.016/0.165]? Uncertainty in W2magmagstat.error;phot.magfloatnullableW3mag[2.495/13.051]? Apparent WISE 12 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_W3mag[0.013/0.406]? Uncertainty in W3magmagstat.error;phot.magfloatnullableW4mag[2.519/8.816]? Apparent WISE 22 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_W4mag[0.018/0.423]? Uncertainty in W4magmagstat.error;phot.magfloatnullable_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.mainJ/AJ/157/63/table3Derived parametersStarStar identifiermeta.id;meta.maincharMethMethod for determining the metallicity (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeSpectral type (1)src.spTypecharTeff[2700/4300] Effective temperatureKphys.temperature.effectiveinte_Teff[100] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogL[-3.137/-1.044] Bolometric luminosity (log(L_bol_/L_{sun}_))log(solLum)phys.luminosityfloate_logL[0.001/0.333] Uncertainty in logLlog(solLum)stat.errorfloatRad[0.104/0.626] RadiussolRadphys.size.radiusfloate_Rad[0.007/0.165] Uncertainty in RadsolRadstat.errorfloat[Fe/H][-1.88/0.25] Metallicityphys.abund.Zfloate_[Fe/H][0.08/0.3] Uncertainty in [Fe/H]stat.error;phys.abund.Fefloatr_Meth[abc] Reference for Meth (3)meta.ref;pos.framechar