J/A+A/665/A36ivo://CDS.VizieR/J/A+A/665/A36doi:10.26093/cds/vizier.36650036CDSGebruers S.Tkachenko A.Bowman D.M.Van Reeth T.Burssens S.,IJspeert L.Mahy L.Straumit I.Xiang M.Rix H-.W.Aerts C.2022-09-14T06:01:30Z2022-09-08T12:42:42ZCDS support team

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

cds-question@unistra.frasteroseismologyvariable-starsb-starspeculiar-variable-starsspectroscopyphotometryclassificationSpectroscopic data are necessary to break degeneracies in asteroseismic modelling of the interior structure in high- and intermediate-mass stars. With the TESS mission, the number of bright intermediate-mass B-type stars with long photometric light curves, that are therefore suitable for detailed asteroseismic studies, has increased substantially compared to the pre-TESS era. We derive precise photospheric stellar parameters for a sample of 166 B-type stars with TESS light curves through a homogeneous spectroscopic analysis. The variability types of these sample stars are also classified based on all currently available TESS sectors and ultimately prioritised according to their astrophysical potential. We obtained high-resolution spectra for all 166 targets with the FEROS spectrograph in the context of a large program.The spectra are reduced with the CERES pipeline, that we adapted to improve the quality of the reduced spectra. These spectra are subsequently analysed with the zeta-Payne, a machine learning-based spectrum analysis algorithm, to infer precise stellar labels for all stars in the sample. Furthermore, the Least-Squares Deconvolution (LSD) method is employed to investigate spectral line profile variability (LPV) and isolate binary systems from presumably single stars. The LSD profile analysis identified 26 spectroscopic double-lined binaries; the remainder of the sample are 42 supergiants in the Large Magellanic Cloud galaxy and 98 Galactic stars, both with and without apparent LPV. For the Galactic single stars and single-lined spectroscopic binaries, we determine their five main surface parameters: effective temperature (Teff), surface gravity (logg), global metallicity ([M/H]), projected rotational velocity (vsini), and microturbulent velocity (vmicro) with average formal precisions of 70K, 0.03dex, 0.07dex, 8km/s, and 0.7km/s respectively. The average internal uncertainties we find for FEROS spectra with our spectrum analysis method are 430K (Teff), 0.12dex (logg), 0.13dex ([M/H]), 12km/s (vsini), and 2km/s (vmicro). We find spectroscopic evidence that eight of the 98 galactic single or SB1 variables are fast rotating gravity-mode pulsators occurring in between the slowly pulsating B (SPB) stars and delta Scuti instability strips. The g-mode frequencies of these pulsators are shifted to relatively high frequency values due to their rotation, and their apparently too low Teff relative to the SPB instability region can in most cases be explained by the gravity darkening effect. We also discover 13 new HgMn stars in the Galactic sample of which only one is found in a spectroscopic binary, resulting in a biased and therefore unreliable low binary rate of only 8%.2022A&A...665A..36Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/665/A36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/665/A36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/665/A36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/665/A36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/665/A36https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/665/A36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/665/A36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/665/A36/tablea1 (Photometric classification of the Galactic single stars, Galactic SB1 systems, and SB2 systems considered in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/665/A36/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/665/A36/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/665/A36/tablea1?GETtext/xml+votable180.050000true84.2290772-66.56028560.0055555555555555565/9393 6/16577 16617 16804 32852 32877 32935 33030 33035 33053 33074-33075 33084 33098 33104 33112-33113 33117 33123 33130 33137 33156 33190 33225 33633 33807 33814 33826 33832 33842 33937 34873 37033 37051 37099 37101 37407 37410-37411 37421-37422 37428 37440 37443 37450 37452 37454 37481 37485 37487 37496 37509 37513 37516-37517 37521 37525 37527 37534 37541 37543 37545 37552 37557 37571 37578 37582 37584 37587 37592-37593 37604 38912 38915 38917-38918 38925-38926 38932 38935 38940-38941 38947 38952 38957 38960-38962 38964 38968 38976 38978 39041 39044 39053 39057 39065 45343 46185 46335 46619 46812 46986 47005 47028 48146 48355 48455https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/665/A36?format=asciidefaultJ/A+A/665/A36/tablea1Photometric classification of the Galactic single stars, Galactic SB1 systems, and SB2 systems considered in this workSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpecindicates spectroscopic information and surface parameter in table A2meta.ref.urlcharNameStar namemeta.id;meta.maincharprimaryn_Name[*] * for LMC membersmeta.notecharTICTIC identifiermeta.idSectorsNumber of used TESS sectorsmeta.idcharVarVariability type (1)meta.notecharSB2[SB2 ] Double-lined spectroscopic binariesmeta.codechar_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/A+A/665/A36/tablea2Spectroscopic information and surface parameters for the 98 Galactic stars in this work analysed with the zeta-PaynerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharNNumber of FEROS spectrameta.numberintS/NSignal-to-noise ratio of averaged spectrumstat.snrintSpectSpectroscopic information (1)meta.codecharTeffEffective temperatureKphys.temperature.effectiveinte_TeffStatistical uncertainty on TeffKstat.error;phys.temperature.effectiveintei_TeffStatistical+internal uncertainty on TeffKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggStatistical uncertainty on logglog(cm.s**-2)stat.errorfloatei_loggStatistical+internal uncertainty on logglog(cm.s**-2)stat.error;stat.valuefloatvsiniProjected rotational velocitykm/sphys.veloc.rotatinte_vsiniStatistical uncertainty on vsinikm/sstat.error;phys.veloc.rotatintei_vsiniStatistical+internal uncertainty on vsinikm/sstat.error;phys.veloc.rotatintvmicroMicroturbulent velocitykm/sphys.velocfloate_vmicroStatistical uncertainty on vmicrokm/sstat.errorfloatei_vmicroStatistical+internal uncertainty on vmicrokm/sstat.error;stat.valueint[M/H]Metallicityphys.abund.Zfloate_[M/H]Statistical uncertainty on [M/H]stat.error;phys.abundfloatei_[M/H]Statistical+internal uncertainty on [M/H]stat.errorfloat