J/AJ/166/54ivo://CDS.VizieR/J/AJ/166/54doi:10.26093/cds/vizier.51660054CDSMonier R.Niemczura E.Kurtz D.W.Rappaport S.Bowman D.M.,Murphy S.J.Lebreton Y.Stuik R.Deal M.Merle T.Kilicoglu T.,Gebran M.Le Ster E.2024-11-06T20:18:50Z2024-02-23T09:25:17ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsmultiple-starsvisible-astronomyspectroscopychemical-abundancesspectral-energy-distributionWe report on a detailed abundance study of six bright, mostly southern, slowly rotating late B-stars: HD1279 (B8III), HD99803 (B9V), HD123445 (B9V), HD147550 (B9V), HD171961 (B8III), and HD202671 (B5II/III), hitherto reported as normal stars. We compare them to the two classical HgMn stars {mu}Lep and {beta}Scl, and to the superficially normal star {nu}Cap. In the spectra of the six stars, the HgII line at 3984{AA} line is clearly seen and numerous lines of P, Ti, Mn, Fe, Ga, Sr, Y, and Zr appear to be strong absorbers. A comparison of newly acquired and archival spectra of these objects with a grid of synthetic spectra for selected unblended lines reveals large overabundances of P, Ti, Cr, Mn, Sr, Y, Zr, Ba, Pt, and Hg, and underabundances of He, Mg, Sc, and Ni. The effective temperatures, surface gravities, low projected rotational velocities, and the peculiar abundance patterns of the six investigated stars show that they are new chemically peculiar stars, mostly new HgMn stars, and are reclassified as such. The evolutionary status of these stars has been inferred, and their ages and masses estimated. The two most massive objects, HD1279 and HD202671, might have evolved away from the main sequence recently, the other stars are main-sequence objects. HD99803A is a sharp lined HgMn star with grazing eclipses. From TESS and MASCARA photometry, we determine an orbital period of Porb=26.12022{+/-}0.00004day.2023AJ....166...54Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/54CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/117 : MK Classifications of Close Visual Binaries (Corbally, 1984)II/215 : uvby-beta Catalogue (Hauck+ 1997)J/A+A/274/335 : Abundances in normal late-B and HgMn stars (Smith+ 1993)J/AJ/107/1556 : Late B-type stars classification (Garrison+, 1994)J/A+AS/125/219 : Abundances of mu Lep, 7 Sex, HR 4817 & 28 Her (Adelman+ 1997)J/A+A/425/263 : Spectroscopic atlas of HD17564 (Castelli+, 2004)J/ApJS/162/227 : Transition probabilities for SmII (Lawler+, 2006)J/MNRAS/418/863 : NLTE corrections for Mg and Ca lines (Merle+ 2011)J/A+A/537/A146 : Stellar models with rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)J/AJ/158/157 : Fairly bright slow rotators compositions (Monier+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/54https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/166/54/table10Line identifications for HD 99803A (HR 4423)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWaveObs[3901/6682]? Observed wavelength, Angstroms0.1nmem.wldoublenullableWaveLab[3900/6681]? Laboratory wavelength, Angstroms0.1nmem.wldoublenullableIonSpecies identificationphys.atmol.ionStagecharloggflog, statistical weight*oscillator strengthstat.weight;phys.atmol.oscStrengthcharElow[0/281124]? Energy, lower leveleVphys.energy;phys.atmol.leveldoublenullableFlux[0.13/0.99]? Relative Fluxphot.flux;arith.ratiofloatnullable