J/MNRAS/499/2701ivo://CDS.VizieR/J/MNRAS/499/2701CDSMurphy S.J.Gray R.O.Corbally C.J.Kuehn C.Bedding T.R.Killam J.2023-11-07T09:14:31Z2023-11-07T10:10:57ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsearly-type-starsemission-line-starsstellar-spectral-typeseffective-temperaturechemical-abundancesinterstellar-reddeningvisible-astronomyspectroscopyinfrared-astronomyThe {lambda} Boo stars are chemically peculiar A-type stars whose abundance anomalies are associated with the accretion of metal-poor material. We searched for {lambda} Boo stars in the Southern hemisphere in a targeted spectroscopic survey of metal-weak and emission-line stars. Obtaining spectra for 308 stars and classifying them on the MK system, we found or co-discovered 24 new {lambda} Boo stars. We also revised the classifications of 11 known {lambda} Boo stars, one of which turned out to be a chemically normal rapid rotator. We show that stars previously classified in the literature as blue horizontal branch stars or emission-line A stars have a high probability of being {lambda} Boo stars, although this conclusion is based on small-number statistics. Using WISE infrared fluxes, we searched our targets for infrared excesses that might be attributable to protoplanetary or debris discs as the source of the accreted material. Of the 34 {lambda} Boo stars in our sample, 21 at various main-sequence ages have infrared excesses, confirming that not all {lambda} Boo stars are young.2020MNRAS.499.2701Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/499/2701CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/154/31 : {lambda} Bootis stars: the southern survey I. (Gray+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/499/2701https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/499/2701http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/499/2701https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/499/2701https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/499/2701http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/499/2701GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/499/2701/tablea1 (Spectral classes for the program stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/499/2701/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/499/2701/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/499/2701/tablea1?GETtext/xml+votable180.050000true67.3337506-5.51082610.0055555555555555565/11090 6/4124 20797 20852 20899 20946 20959 21148 21388 21421 21432 21436 21438-21439 21482 21541 21643 21665 21750 22051 22089 22119 22217 22546 22735 22805 22815 22837 22841 22850 22858 22860 22862 22880-22881 22990 23679 23744 23817 24649 24685 24772 24839 24877 25100 25571 25577 25582 25598 26291 26901 26907 26909 26929 26932-26933 26935 26937 26942 26945 26955-26956 26971 26975 26999 27001 27007 27029 27075 27077 27081 27087 27092 27096 27100 27120 27577 27657 27661 27684 27695 27910 28704 28707 28711 28715 28762 28801 28806 28809 28822 28836 28864 28879 28921 28975 29190 29193 29195 29380-29381 29389 30906 31259 31265 31319 31375 32292 33098 34037 37130 37149 37194 37227 37240 37316 37335 37338 37349 37351 37592-37594 37728 37788 37893 37895 37911 37915-37916 37923 37933 37944 37961 37978 38109 38238 38304 38334 38420 38458 38489 38536 38824 39181 39208 39216 39228 39341 39697 39739 39806 40029 41112 41115 41424 41427 41444-41445 41481 41483-41484 41555 41561 41598 41613 41617 41619 41628 41631 41674 41684 41716 41725 41738 41795 41859 42059 42093 42128 42278 42340 42375 42421 42464 42606 42611 42618 42644 42674 42680 42719 42751 42813 42815 42839 42908 42923 42930 42939 42949 42956 42972 42990 43012 43017-43019 43021 43026 43031 43033 43035 43044 43047-43048 43052 43054 43056-43057 43059 43072 43074-43075 43136-43138 43141 43144 43154 43306 43420 43458 43557 43722 43851 44060 44083 44119 44289 44296 44298 44301 44308 44312 44316 44319 44358 44371 44378 44389 44392 44400 44403 44409 44499 44807 44832 44931 45209 47110 47342 47520 47623 47760 478283.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/499/2701?format=asciiOpticalInfrareddefaultJ/MNRAS/499/2701/table2Infrared excesses for all stars of the sample with a >=2{sigma} excess in one or more WISE bandsNameStar namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypecharBoo[0/1] Indicates whether the star is in the lambda Boo class (1:yes; 0:no)meta.codeintNormNormalisation band (Johnson V or 2MASS J)meta.codecharTeffEffective temperatureKphys.temperature.effectiveintloggLogarithm of the surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Fe/H abundance ratiophys.abund.Fe;arith.ratiofloatE(B-V)? Reddening E(B-V)magphot.color.excessfloatnullablefW1? Flux fraction in excess of the model in the W1 band (1)phot.flux;arith.ratiofloatnullablee_fW1? Error on fW1stat.errorfloatnullablefW2? Flux fraction in excess of the model in the W2 band (1)phot.flux;arith.ratiofloatnullablee_fW2? Error on fW2stat.errorfloatnullablefW3? Flux fraction in excess of the model in the W3 band (1)phot.flux;arith.ratiofloatnullablee_fW3? Error on fW3stat.errorfloatnullablefW4? Flux fraction in excess of the model in the W4 band (1)phot.flux;arith.ratiofloatnullablee_fW4? Error on fW4stat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/499/2701/table3Parameters from SED fitting, for the stars without detected infrared excessesBoo[0/1] Indicates whether the star is in the lambda Boo class (1:yes; 0:no)meta.codeintTeff? Effective temperatureKphys.temperature.effectiveintnullableNameStar namemeta.id;meta.maincharSpTypeSpectral typesrc.spTypecharNormNormalisation band (Johnson V or 2MASS J)meta.codecharlogg? Logarithm of the surface gravitylog(cm.s**-2)phys.gravityfloatnullable[Fe/H]? Fe/H abundance ratiophys.abund.Fe;arith.ratiofloatnullableE(B-V)? Reddening E(B-V)magphot.color.excessfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/499/2701/tablea1Spectral classes for the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMoreLink to Table 2 or 3meta.ref.urlcharNameStar namemeta.id;meta.maincharprimaryVmag? V-band magnitudemagphot.mag;em.opt.VfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharGroupTarget group (1)meta.codecharSpTypeSpectral typesrc.spTypecharComComment on the spectrum of the starmeta.notecharIR[0/1] Indicates if the star has an infrared excess (1:yes; 0:no)meta.codeint_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