J/AJ/143/134ivo://CDS.VizieR/J/AJ/143/134doi:10.26093/cds/vizier.51430134CDSMcCarthy K.White R.J.2017-12-06T07:38:17Z2013-07-16T07:43:00ZCDS support team

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

cds-question@unistra.frmultiple-starsvisible-astronomybroad-band-photometryline-intensitiesWe present moderate resolution (R~3575) optical spectra of 19 known or suspected members of the AB Doradus and {beta} Pictoris Moving Groups, obtained with the DeVeny Spectrograph on the 72inch Perkins telescope at Lowell Observatory. For four of five recently proposed members, signatures of youth such as LiI 6708{AA} absorption and H{alpha} emission further strengthen the case for youth and membership. The lack of detected lithium in the proposed {beta} Pic member TYC 2211-1309-1 implies that it is older than all other K-type members and weakens the case for membership. Effective temperatures are determined via line ratio analyses for the 11 F, G, and early-K stars observed, and via spectral comparisons for the eight late-K and M stars observed. We assemble updated candidate membership lists for these moving groups that account for known binarity. Currently, the AB Dor Moving Group contains 127 proposed members and the {beta} Pic Moving Group holds 77 proposed members. We then use temperature, luminosity, and distance estimates to predict angular diameters for these stars; the motivation is to identify stars that can be spatially resolved with long-baseline optical/infrared interferometers in order to improve age estimates for these groups and to constrain evolutionary models at young ages. Considering the portion of the sky accessible to northern hemisphere facilities (DE>-30), six stars have diameters large enough to be spatially resolved ({theta}>0.4mas) with the CHARA Array, which currently has the world's longest baseline of 331m; this subsample includes the low-mass M2.5 member of AB Dor, GJ 393, which is likely to still be pre-main sequence. For southern hemisphere facilities (DE<+30), 18 stars have diameters larger than this limiting size, including the low-mass debris disk star AU Mic (0.72mas). However, the longest baselines of southern hemisphere interferometers (160m) are only able to resolve the largest of these, the B6 star {alpha} Gru (1.17mas); proposed long-baseline stations may alleviate the current limitations.2012AJ....143..134Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)I/259 : The Tycho-2 Catalogue (Hog+ 2000)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/AJ/140/119 : {beta}Pic and AB Dor moving groups members (Schlieder+, 2010)J/A+A/508/833 : SACY III. Li abundances (Da Silva+, 2009)J/ApJ/683/424 : CHARA observations of 3 late-type stars (Boyajian+, 2008)J/ApJ/670/1367 : Gemini Deep Planet Survey (Lafreniere+, 2007)J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006)J/A+A/433/151 : Spectrocopic result on ROSAT late-type stars (Zickgraf+, 2005)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)J/A+AS/145/67 : Double stars measurements (Morlet+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/134https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/143/134/table2 (Proposed {beta} Pictoris moving group members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/134/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/134/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/134/table2?GETtext/xml+votable180.050000true1.7086944-23.107540.005555555555555556Cone search capability for table J/AJ/143/134/table3 (LiI and H{alpha} equivalent widths)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/134/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/134/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/134/table3?GETtext/xml+votable180.050000true24.346826.95335830.005555555555555556Cone search capability for table J/AJ/143/134/table1 (Proposed AB Doradus moving group members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/134/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/134/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/134/table1?GETtext/xml+votable180.050000true4.587041730.9561750.0055555555555555566/102 129 601 674 719 722 765 784 826 940 1762 2101 2374 2966 10203 12417 12436 12770 13450 13512 13674 15686 16393 16426 16543 16606 16719 16853 16930 17288 17552 17887 18797 19163 19888 19948 20327 20492 20505 20510 20610 20618 20637 20706 21050 21082 21180 21217 21296 21386 21436 21763 22619 22773 22823 22856 22964 23094 23136 23140 23155 23321 23388 23895 26133 26250 27392 28746 28784 28810 29357 29569 29993 29999 30328 30477 30826 31104 33116 33193 33850 33937 34054 34074 34126 34138 34206 34245 34290 35123 35147 36713 36884 36899 36969 37010 37419 38472 38936 38950 38969 38986 39122 39625 39829 41295 41798 42096 42242 42252 42272 44439 45351 45746 46383 46615 46788 46922 47120 47125 47205 47287 47626 47703 47777 47863 47941 47943 48038 48045 48061 48263 48274 48559 48651 489058.650015785639275e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/143/134?format=asciiOpticaldefaultJ/AJ/143/134/table2Proposed {beta} Pictoris moving group membersSimbadNameSimbad column added by the CDSmeta.idcharSpT1Previous MK spectral typesrc.spTypecharONameOther name (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD? HD identifiermeta.idintnullablem_HDHD component (A, Aa, Ab, B, Ba, Bb or C)meta.code.multipcharHIP? HIP identifier (from Cat. I/239)meta.idintnullablem_HIPHIP component (A, Aa, Ab, B, Ba, Bb or C)meta.code.multipcharWSimbad column added by the CDSmeta.ref.urlcharn_Dist[*Hc] Method used to derive Dist (2)meta.notecharDist[7.23/143] Heliocentric distancepcpos.distancefloatf_Vmag[d] possible bias due to unseen companion (3)meta.codecharVmag[1.7/14.8]? Johnson V-band magnitudemagphot.mag;em.opt.Vfloatnullablef_Ksmag[d] possible bias due to unseen companion (3)meta.codecharKsmag[2.02/12.72]? 2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablef_SpT1[:] spectral type estimated from photometry (4)meta.codecharTeff1? Previous effective temperatureKphys.temperature.effectiveintnullableSpT2New MK spectral typesrc.spTypecharTeff2? New effective temperature (see Section 4.3)Kphys.temperature.effectiveintnullablef_L[d] possible bias due to unseen companion (3)meta.codecharL? Bolometric luminositysolLumphys.luminosityfloatnullablef_theta[d] possible bias due to unseen companion (3)meta.codechartheta? Angular size {theta} (see Section 5)masphys.angSizefloatnullableMultMultiplicity status of the star, if known (S=single, B=binary, T=triple or Q=quadruple)meta.code.multipcharSep? Projected separation for multiple star (if the pair has been spatially resolved)arcsecpos.angDistancefloatnullableRefMultiplicity reference (in refs.dat file)meta.ref;pos.framechar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/143/134/refsReferencesBibCodeBibCodemeta.bib.bibcodecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference identifierpos.framecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/143/134/table3LiI and H{alpha} equivalent widthsSimbadNameSimbad column added by the CDSmeta.idcharGroupMoving group (AB=AB Doradus, bP={beta}Pictoris)meta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD? HD identifiermeta.idintnullableHIP? Hipparcos identifier (from Cat. I/239)meta.idintnullableONameOther name (1)meta.id;meta.maincharRunObservational run (5=observed during the May run, 8=observed during the August run)meta.notecharS/N[40/350] Signal-to-noise ratio estimatesstat.snrintl_W(Li)Upper limit in EWLimeta.code.errorcharW(Li)Equivalent widths of LiI 6708{AA}0.1nmspect.line.eqWidthfloatW(Ha)Equivalent widths of H{alpha}0.1nmspect.line.eqWidth;em.line.Halpha;spect.linefloatPropDetails from table 1 or 2meta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/143/134/table1Proposed AB Doradus moving group membersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD? HD identifiermeta.idintnullablem_HDHD component (A, Aa, Ab, B, Ba, Bb or C)meta.code.multipcharHIP? HIP identifier (from Cat. I/239)meta.idintnullablem_HIPHIP component (A, Aa, Ab, B, Ba, Bb or C)meta.code.multipcharWSimbad column added by the CDSmeta.ref.urlcharONameOther name (1)meta.id;meta.maincharn_Dist[*Hc] Method used to derive Dist (2)meta.notecharDist[7.23/143] Heliocentric distancepcpos.distancefloatf_Vmag[d] possible bias due to unseen companion (3)meta.codecharVmag[1.7/14.8]? Johnson V-band magnitudemagphot.mag;em.opt.Vfloatnullablef_Ksmag[d] possible bias due to unseen companion (3)meta.codecharKsmag[2.02/12.72]? 2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablef_SpT1[:] spectral type estimated from photometry (4)meta.codecharSpT1Previous MK spectral typesrc.spTypecharTeff1? Previous effective temperatureKphys.temperature.effectiveintnullableSpT2New MK spectral typesrc.spTypecharTeff2? New effective temperature (see Section 4.3)Kphys.temperature.effectiveintnullablef_L[d] possible bias due to unseen companion (3)meta.codecharL? Bolometric luminositysolLumphys.luminosityfloatnullablef_theta[d] possible bias due to unseen companion (3)meta.codechartheta? Angular size {theta} (see Section 5)masphys.angSizefloatnullableMultMultiplicity status of the star, if known (S=single, B=binary, T=triple or Q=quadruple)meta.code.multipcharSep? Projected separation for multiple star (if the pair has been spatially resolved)arcsecpos.angDistancefloatnullableRefMultiplicity reference (in refs.dat file)meta.ref;pos.framechar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main