J/A+A/687/A228ivo://CDS.VizieR/J/A+A/687/A228doi:10.26093/cds/vizier.36870228CDSde Burgos A.Simon-Diaz S.Urbaneja M.A.Puls J.2026-01-20T12:11:47Z2024-07-17T07:45:09ZCDS support team

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

cds-question@unistra.frob-starsspectroscopyhertzsprung-russell-diagramchemical-abundancesastronomical-modelsBlue supergiants (BSGs) are key objects for understanding the evolution of massive stars. However, discrepancies between theoretical predictions and empirical observations have opened up important questions yet to be answered. Studying statistically significant and unbiased samples of BSGs can help to improve the situation. We aim to perform a homogeneous and comprehensive quantitative spectroscopic analysis of a large sample of Galactic luminous blue stars (a majority of which are BSGs) from the IACOB spectroscopic database. We derive the projected rotational velocity (vsin(i)) and the macroturbulent broadening (vmac) using IACOB-BROAD. We used FASTWIND computations to derive effective temperatures (Teff), surface gravities, microturbulences (xi), silicon and helium surface abundances, and the wind-strength parameter. We provide estimates of these quantities for the largest sample of Galactic luminous O9-B5 stars spectroscopically analyzed to date, comprising 527 targets. We find a drop in the relative number of stars at ~21 kK, coinciding with a scarcity of fast rotating stars below that temperature. We speculate that this feature might be roughly delineating the location of the Terminal-Age-Main-Sequence in the 15-85M_sol range. By investigating the main characteristics of the vsin(i) distribution as a function of Teff, we propose that an efficient mechanism transporting angular momentum from the stellar core to the surface might be operating along the main sequence. We find correlations between xi, v_mac and the spectroscopic luminosity. We also find that no more than 20% of the stars in our sample have atmospheres clearly enriched in helium, and suggest that the origin of this specific sub-sample might be in binary evolution. We do not find clear empirical evidence of an increase in the wind-strength over the wind bi-stability region towards lower temperatures.2024A&A...687A.228Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A228CatalogResearchIsServedByTAP 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/687/A228https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/687/A228http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/687/A228https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/687/A228https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/687/A228http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/687/A228GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/687/A228/tabled1 (Relevant information and analysis results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A228/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A228/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A228/tabled1?GETtext/xml+votable180.050000true270.116265-29.8243740.0055555555555555565/7229 6/1198 1293 1297 1300 1303 1323 1330 1777 1787 1824 1946 2544 2909 2940-2941 3035 3037 3051 3058-3060 3066 3068 3153 3188 3214 3231 3235 3239 3243-3245 3249 3251 3253-3258 3260 3278 3286 3296 3298 3305 3307 3312 3315 3331 3373 3384 3430 3598 3600-3601 3603-3604 3609-3610 3619 3621 3623 3625 3632 3644 3659 3683 3713-3714 3722-3724 3726-3727 3747 3785 5506 12400 12965 12972 12981 13001 13115 13255 13273 13276 13291 13729 13953 13999 14015 14062 14075 14173 14175 14179 14207 14228 14240 14246-14248 14259 14263-14264 14286 14295 14301-14302 14305 14307 14309-14310 14312 14324 14353 14356 14368 14387 14425 14431 14435 14459 14595 14622 14624-14625 14628 14630-14632 14636 14641-14646 14648-14649 14654-14655 14690-14691 14694 14712 14734 14737 14741 14745 14754 14777 14783-14784 14789 14793 14795 14824-14825 15374 15392 15399 15442 15476 15478 15481 15553 15573 15577 15611 15656 15663 15672 15674 15677 15685 15687 15732 15747-15748 15765 16023 18439 20107 20759 20767 20828 20834 20847 20860-20861 20915 20985 21401 21465 21517 21530 21641 21644 21646 21656 21671 21680 21682 21711 21997 22033 22114 22122 22182 22208 22216 22223 22246 22249 22264 22854 22862 22884 23360 23374 23670 23717 23979 23983-23984 23986 23998 24325 24333 24338 24340 24370 24379 24424 24504 24511 24552 24555 27498 28714 28719 28796 28837 28864-28865 28867 28888 28890-28891 28895 28913 28915 29072 29084-29085 29088-29089 29091 29094-29095 29098 29100-29101 29106-29107 29109-29110 29113-29114 29116-29117 29153-29154 29157 29190 29249 29291 29299 29304 29445 29453 29456 29459-29460 29463-29464 29467 29504 29510-29512 29527 29893 30215 30256 30332-30333 30818 30925 31056 31705 31748 32793 33652 37209 37233 37316 37333-37334 37339 37768 37833 37871 37877 37888 37893 37898 37901 37905 37926 37930 37932 38016 38022 38024 38066 38074 38110 39209 39252 39264 39297 39374 39417 39729 39754 39831 39853 39873 39876 39931 39971 40068 40122 40490 41464 41510 41574 41592 41615 41630 41646 41672-41673 41675 41677 41686 41692 41702 41713 41758 41812-41813 41858 41963 42075 42080 42116 42139 42157 42190 42206 42213 42221 42228 42236 42283 42287 42299 42324 42383 42394-42395 42410 42417 42439 42458 42470-42471 42477 42489 42764 43011 43033 43035-43036 43045 43086 43088 43119 43165 43234 44717 47648 48042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/687/A228?format=asciidefaultJ/A+A/687/A228/tabled1Relevant information and analysis resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifiable name of the starmeta.id;meta.maincharSimbadNameSimbad column added by the CDSmeta.idcharnullable_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexed_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexedGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latSpCAdopted spectral classification (1)src.spTypecharn_SpC[1/3]? Note on SpC (1)meta.noteintnullablevsiniProjected rotational velocity (2)km/sphys.veloc.rotatintvmac? Macroturbulent velocity (3)km/sphys.velocintnullableTeffEffective temperatureKphys.temperature.effectiveinte_TeffLower uncertainty on effective temperatureKstat.error;phys.temperature.effectiveintE_TeffUpper uncertainty on effective temperatureKstat.error;stat.maxintloggSurface gravity (4)log(cm.s**-2)phys.gravityfloate_loggLower uncertainty on surface gravitylog(cm.s**-2)stat.errorfloatE_loggUpper uncertainty on surface gravitylog(cm.s**-2)stat.error;stat.maxfloatf_xiProbability distribution flag (microturbulence)meta.codecharxiMicroturbulencekm/sphys.veloc.microTurbinte_xi? Lower uncertainty on microturbulencekm/sstat.errorintnullableE_xi? Upper uncertainty on microturbulencekm/sstat.error;stat.maxintnullablef_He[=>d] Probability distribution flag (helium abundance)meta.codecharHe? Helium surface abundance (N(He)/N(H))phys.abund.Yfloatnullablee_He? Lower uncertainty on helium surface abundancestat.errorfloatnullableE_He? Upper uncertainty on helium surface abundancestat.error;stat.maxfloatnullablef_logQ[<=>] Probability distribution flag (wind-strength)meta.codecharlogQ? Wind-strength (Msol/a km/s R/Rsol)stat.fit.paramfloatnullablee_logQ? Lower uncertainty on wind-strengthstat.errorfloatnullableE_logQ? Upper uncertainty on wind-strengthstat.error;stat.maxfloatnullableq[1/4] Quality flagmeta.code.qualintRef.fileFits file-name of the used spectrummeta.id;meta.filecharS/NSignal-to-noise ratio in 4000-5000Astat.snrint