J/A+A/667/A44ivo://CDS.VizieR/J/A+A/667/A44doi:10.26093/cds/vizier.36670044CDSGuo Y.Liu C.Wang L.Wang J.Zhang B.Ji K.Han Z.Chen X.2024-11-06T20:01:16Z2022-11-04T09:43:05ZCDS support team

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

cds-question@unistra.frearly-type-starsradial-velocityvisible-astronomyMassive binary stars play a crucial role in many astrophysical fields. Investigating the statistical properties of massive binary stars is essential to trace the formation of massive stars and constrain the evolution of stellar populations. However, no consensus has been achieved on the statistical properties of massive binary stars, mainly due to the lack of a large and homogeneous sample of spectroscopic observations. To study the intrinsic binary fraction f^in^_b_ and distributions of mass ratio f(q) and orbital period f(P) of early-type stars (comprise of O/B/A-type stars) and investigate their dependencies on effective temperature Teff, stellar metallicity [M/H] and the projection velocity vsini, based on the homogeneous spectroscopic sample of from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release Eight (DR8). We collect 886 early-type stars, each with more than six observations from the LAMOST DR8, and divide the sample into subgroups based on their derived effective temperature (Teff), metallicity ([M/H]), and projected rotational velocity (vsini). Radial velocity measurements were archived from a prior study. A set of Monte-Carlo simulations, following distributions of f(P) {prop.to} P^{pi}^and f(q) {prop.to} q^{gamma}^ were applied to the observed binary fraction to correct for any observational biases. The uncertainties of the derived results induced by the sample size and observation frequency are examined systematically. We found that f^in^_b_ increases with increasing Teff. For stars in groups of B8-A, B4-B7, O-B3, the binary fractions are f^in^_b_=48%+/-10%, 60%+/-10%, and 76%+/-10%, respectively. The binary fraction is positively correlated with metallicity for spectra in the sample, with derived values of f^in^_b_=44%+/-10%, 60%+/-10% and 72%+/-10% for spectra with metallicity spanning from [M/H]<-0.55, -0.55<=[M/H]<-0.1, to [M/H]>=-0.1. Over all the vsini values we have considered, the f^in^_b_ have constant values as ~50%. It seems that the binary population is relatively evenly distributed over a wide range of vsini values, while the whole sample shows that most of the stars are concentrated in low values of vsini (probably from strong wind and magnetic braking of single massive stars), and in high values of vsini (likely from the merge of binary stars) in cases. Stellar evolution and binary interaction may be partly responsible for this. In case of observations with more than six observations, we have derived {pi}=-0.9+/-0.35, -0.9+/-0.35, and -0.9+/-0.35, and {gamma}=-1.9+/-0.9, -1.1+/-0.9 and -2+/-0.9 for O-B3, B4-B7, B8-A type stars, respectively. There are no correlations being found between {pi}({gamma}) and Teff, and neither for {pi}({gamma}) and [M/H]. The uncertainties of the distribution decrease towards a larger sample size with higher observational cadence.2022A&A...667A..44Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/667/A44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/257/54 : Early-type star param. from LAMOST LRS + MRS (Guo+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/667/A44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/667/A44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/667/A44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/667/A44https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/667/A44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/667/A44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/667/A44/table2 (List of basic information for 886 early-type stars from LAMOST DR8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A44/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A44/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A44/table2?GETtext/xml+votable180.050000true222.890239.772220.0055555555555555565/324 326 814-815 900 5560 5985 5987-5988 5990 5996 6081 6083-6084 6086 6094-6095 6116-6117 6134 6/378 464 473-474 478 1285 1287 1293 1300-1301 1309 1344 1346 1433-1435 1439 1447 1453 1455 1457 1460 1462 1464-1465 1467 1470 1749 1751 1757 1769-1771 1773-1775 1784 1797 1808-1809 1920 1922-1923 1927 1929-1930 1932 1960 1966-1967 2996-2997 2999 3004-3005 3018-3020 3022 3040 3042 3048 3133-3138 3140 3142 3146-3148 3170-3171 3177-3179 3187 3189 3193 3197-3199 3219-3220 3222-3223 3227-3228 3231 3237 3245 3247 3252 3254-3255 3265 3267-3268 3272 3274 3281 3285 3287 3304 3306 3333 3336-3337 3340 3360 3362 3366 3368-3370 3456 3458 3589-3591 3604-3606 3609 4288 4897 5514 5798 9207 9839 9926 9932 10576-10577 10970 10980 10993 13407 13428 13437 13578 13601-13602 13605 13610 14941 15106 22218 22222 22244 22246 22248 22252-22254 22258 22268 22271 23617 23632 23811 23818 23918 23939 23945 23947 23964 23966 23969 23972-23973 23975 23983 23994-23996 23998-23999 24003 24252 24290-24291 24323 24340 24342-24343 24348 24350 24356-24357 24367-24369 24371 24374-24375 24418 24424 24426-24427 24431 24442 24453 24473 24476-24477 24495 24505-24507 24509-24510 24512 24514 24516 24519 24524-24525 24530 24533 24541 24554 28623https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/667/A44?format=asciiOpticaldefaultJ/A+A/667/A44/table2List of basic information for 886 early-type stars from LAMOST DR8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOBSIDThe observation IDmeta.id;obslongRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Right Ascension (J2000)degpos.eq.dec;meta.mainDateMJD datedtime.epochdoubleSNRSignal to noise ratiostat.snrintTeffEffective temperature (1)Kphys.temperature.effectiveint[M/H]Metallicity (1)phys.abund.ZdoublevsiniProjected rotational velocity (1)km/sphys.veloc.rotatintRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVThe uncertainty of radial velocitykm/sstat.errorfloat