J/A+A/690/A176ivo://CDS.VizieR/J/A+A/690/A176doi:10.26093/cds/vizier.36900176CDSNegueruela I.Simon-Diaz S.de Burgos A.Casasbuenas A.Beck P.G.2025-02-24T20:01:40Z2024-10-04T09:08:57ZCDS support team

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

cds-question@unistra.frb-starssupergiant-starsmorgan-keenan-classificationWith the advent of large spectroscopic surveys, automated stellar parameter determination has become commonplace. Nevertheless, spectral classification still offers a quick and useful alternative for obtaining parameter estimates for large samples of spectra of varying quality. We present a new atlas of stellar spectra covering the B-type range, with the intention of providing detailed classification criteria valid for modern spectra and improving the grid of reliable standards. This new grid will be used in future works to provide classification criteria beyond the classical classification range and addressing, in particular, the use of Gaia/RVS spectra. We analysed historical standards by means of multiple high-resolution spectra, marking out problematic cases and complementing the grid with a new set of reliable comparators. We then elaborated on a new set of classification criteria based on high-quality R=4000 spectra. Our new classification grid is much thicker than any previous set of standards, presenting a high degree of self-consistency. Although it is based entirely on morphological criteria, the grid demonstrates a much better correlation with different physical parameters. The new grid can be used to study classification criteria in other spectral ranges, providing a valuable tool for the study of B-type stars that covers a very wide range of temperatures, luminosities, and stellar masses. The very process of classification also offers valuable insights into stellar evolution.2024A&A...690A.176Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/690/A176CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)J/A+A/597/A22 : Massive O- and B-type stars velocities (Simon-Diaz+, 2017)J/A+A/613/A65 : Spectroscopic parameters of O-type stars (Holgado+, 2018)J/A+A/613/A9 : Extinction towards Galactic O stars (Maiz Apellaniz+, 2018)J/A+A/638/A157 : O-type stars near ZAMS elusive detection (Holgado+, 2022)J/A+A/665/A150 : Rotational properties of Galactic O-type stars (Holgado+ 2022)J/A+A/672/A22 : Binarity in fast-rotating O-type stars (Britavskiy+, 2023)J/A+A/674/A212 : Spectroscopic sample of Galactic O9-B9 SGs (de Burgos+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/690/A176https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/690/A176http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/690/A176https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/690/A176https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/690/A176http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/690/A176GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/690/A176/tablef1 (List of standard and reference stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A176/tablef1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A176/tablef1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A176/tablef1?GETtext/xml+votable180.050000true84.0533889-1.20191920.0055555555555555566/463 472 474 496 859 1198 1300 1323 1385 1430 1554 1770-1771 2467 2774 2790 2940 2947 2970 3058 3060 3136 3138 3144 3198 3254 3256-3258 3260 3274 3284 3296 3606 3622 3681 3724 3785 3816 4419 5631 7839 9680 9847 9936 10731 11599 11851 12865 12981 13457 13535 13729 13953 13963 13984 14055 14209 14295 14305 14312 14360 14381 14431 14522 14527 14625 14630 14641 14643 14646 14649 14691 14711 14777 14906 15392 15396 15481 15624 15677 15747 15768 16443 17194 19245 19309 19676 20759 20782 20847 20915 21401 21434 21438-21439 21467 22102 22209 22223 22787 22790 22805 22854 22862 22889 23007 23122 23360 23621 23669 23717 23776 23860 23979 24029 24338 24480 24486 24504 26879 27498 27574 28915 28944 29081 29084 29162 30289 30325 30718 31756 31790 32095 32604 36018 36651 39831 39853 42948 42959 44366 443893.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/690/A176?format=asciiOpticaldefaultJ/A+A/690/A176/tablef1List of standard and reference starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHD catalogue number (HDNNNNNN)meta.id;meta.maincharONameOther common namesmeta.idcharSpTypeSpectral classificationsrc.spTypecharvsiniProjected rotational velocitykm/sphys.veloc.rotatintVmagJohnson V magnitudemagphot.mag;em.opt.VfloatVMAGRough estimate of absolute magnitudemagphys.magAbsfloatFW3414Parameter to estimate line width for H-betastat.fit.paramfloatSB[0/2] Classification as spectroscopic binary (0 is no indication of binarity)meta.codeintProfile[0/5] Type of H-beta profile, if fit not goodmeta.codeintSimbadSimbad column added by the CDSmeta.ref.urlchar_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