Spiral structure as revealed by O and B stars J/MNRAS/487/1400 ivo://CDS.VizieR/J/MNRAS/487/1400 CDS Chen B.-Q. Huang Y. Hou L.-G. Tian H. Li G.-X. Yuan H.-B. Wang H.-F.,Wang C. Tian Z.-J. Liu X.-W. 2023-01-24T14:19:57Z 2023-01-10T13:17:48Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr ob-stars early-type-stars milky-way-galaxy visible-astronomy narrow-band-photometry infrared-photometry Wide-band photometry stellar-distance trigonometric-parallax proper-motions We investigate the morphology and kinematics of the Galactic spiral structure based on a new sample of O- and early B-type stars. We select 6858 highly confident OB star candidates from the combined data of the VST Photometric H{alpha} Survey Data Release 2 (VPHAS+ DR2) and the Gaia Data Release 2 (Gaia DR2). Together with the O-B2 stars from the literature, we build a sample consisting of 14880 O- and early B-type stars, all with Gaia parallax uncertainties smaller than 20 per cent. The new sample, hitherto the largest one of O- and early B-type stars with robust distance and proper motion estimates, covers the Galactic plane of distances up to 6kpc from the Sun. The sample allows us to examine the morphology of the Scutum, Sagittarius, Local, and Perseus Arms in great detail. The spiral structure of the Milky Way as traced by O- and early B-type stars shows flocculent patterns. Accurate structure parameters, as well as the means and dispersions of the vertical velocity distributions of the individual spiral arms are presented. 2019MNRAS.487.1400C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/487/1400 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/487/1400 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/487/1400 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/487/1400 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/487/1400 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/487/1400 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/487/1400 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/487/1400/table2 (OB-star candidate catalogue selected from the VPHAS+ DR2) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/487/1400/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/487/1400/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/487/1400/table2? GET text/xml+votable 180.0 50000 true 100.20411 -1.05728 0.005555555555555556 Cone search capability for table J/MNRAS/487/1400/table4 (O-B2 star catalogue compiled from the literature) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/487/1400/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/487/1400/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/487/1400/table4? GET text/xml+votable 180.0 50000 true 11.76392 -11.87194 0.005555555555555556 4/206 225 891 893 915 1800 1844 2487 2604 2653 5/324-325 327 488 490 735 757-758 765-766 811 813-815 817-818 828 832 897 899 905-910 928-929 931 3322 3551 3559-3560 3563 3570-3571 3576-3577 3580-3581 3588-3589 3651 3655 3657 3659 3670-3674 3869 3871 3893 3914 3921 3936 5204 5215 5379 5382 5384 5411 5417 5420 5511 5517 5519 5530 5552 5554 5560-5561 5748 5911 5995 6084 6094 6117 7183 7205-7207 7212 7217-7219 7222 7224 7228-7229 7276 7278-7279 7289-7290 7365 7382-7383 7554-7555 7558 7561 7564 7567 7573 7579 7583 9309-9311 9333 9335 9341 9343 9429-9431 9436 9438 9460 9462 9465 9467 9470 9473-9476 9478 9480-9482 9504-9506 9602 9808-9809 9811-9812 9816 9818-9820 9841 9843-9844 9847 9851-9852 9854 9927 9937 9940 9942-9945 9967 9972-9973 9975 9980-9981 9983 10367 10396 10399 10413-10415 10421-10422 10424 10426 10428 10439 10442 10445 10448-10450 10453 10464 10538 10541-10543 10552-10553 10556 10574 10583 10592 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42529-42530 42533 42542 42549 42556 42562 42564-42566 42604 42608-42609 42618 42623 42630 42634 42640 42644 42657 42672 42764 42768 42800 42829 42832 42838 42843 42865 42924 42932 42934 42959 42981 42994 43008-43009 43011-43014 43036 43038 43048-43049 43051 43056 43060-43062 43067 43072-43073 43075 43080-43081 43083 43085-43086 43088 43099 43104 43107 43120 43126 43130 43138 43170 43175 43211 43238 43286 43294 43307 43310 43338 43357 43383 43397 43414 43416 43460 43531 43538 43619 43689 43758 43778 43852 44100 44119 44306 44310 44312 44316 44366 44386 44469 44502 44616 45105 45229 45638 46079 46124 46343 46678 46684 46766 46859 47121 47148 47179 47447 47637 47648 47667 47717 47760 47781-47782 47824 47845 47855 47865 47918 48072 48497 48534 48537 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/487/1400?format=ascii Optical Infrared default J/MNRAS/487/1400/table2 OB-star candidate catalogue selected from the VPHAS+ DR2 recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID [1/6858] Star identifier meta.id;meta.main int Refs References (G3) meta.ref;pos.frame char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main umag VPHAS+ u-band magnitude mag phot.mag;em.opt.U float e_umag Error on umag mag stat.error;phot.mag float gmag VPHAS+ g-band magnitude mag phot.mag;em.opt.B float e_gmag Error on gmag mag stat.error;phot.mag float rmag VPHAS+ r-band magnitude mag phot.mag;em.opt.R float e_rmag Error on rmag mag stat.error;phot.mag float imag ? VPHAS+ i-band magnitude mag phot.mag;em.opt.I float nullable e_imag ? Error on imag mag stat.error;phot.mag float nullable Hamag ? VPHAS+ H{alpha}-band magnitude mag phot.flux;em.line.Halpha float nullable e_Hamag ? Error on Hamag mag stat.error;phot.mag float nullable Gmag Gaia DR2 G-band magnitude (G1) mag phot.mag;em.opt double e_Gmag Error on Gmag (G1) mag stat.error;phot.mag double BPmag Gaia DR2 BP-band magnitude (G1) mag phot.mag;em.opt.B double e_BPmag Error on BPmag (G1) mag stat.error;phot.mag double RPmag Gaia DR2 RP-band magnitude (G1) mag phot.mag;em.opt.R double e_RPmag Error on RPmag (G1) mag stat.error;phot.mag double Dist Distance calculated from the Gaia DR2 parallaxes using a Bayesian distance estimator (G2) pc pos.distance double plx Parallax (G1) mas pos.parallax.trig float e_plx Error on plx (G1) mas stat.error;pos.parallax float pmRA Proper motion in right ascension (G1) mas/yr pos.pm;pos.eq.ra float e_pmRA Error on pmRA (G1) mas/yr stat.error;pos.pm;pos.eq.ra float pmDE Proper motion in declination (G1) mas/yr pos.pm;pos.eq.dec float e_pmDE Error on pmDE (G1) mas/yr stat.error;pos.pm;pos.eq.dec float VPHAS+ Display the VPHAS+ DR2 data (Drew et al. 2016, Cat. II/341) meta.ref.url char
J/MNRAS/487/1400/table4 O-B2 star catalogue compiled from the literature GaiaDR2 Display the Gaia DR2 data (Gaia Collaboration, 2018, Cat. I/345) meta.ref.url char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main Gmag Gaia DR2 G-band magnitude (G1) mag phot.mag;em.opt double e_Gmag ? Error on Gmag (G1) mag stat.error;phot.mag double nullable BPmag Gaia DR2 BP-band magnitude (G1) mag phot.mag;em.opt.B double e_BPmag ? Error on BPmag (G1) mag stat.error;phot.mag double nullable RPmag Gaia DR2 RP-band magnitude (G1) mag phot.mag;em.opt.R double e_RPmag ? Error on RPmag (G1) mag stat.error;phot.mag double nullable Dist Distance calculated from the Gaia DR2 parallaxes using a Bayesian distance estimator (G2) pc pos.distance double plx Parallax (G1) mas pos.parallax.trig float e_plx Error on plx (G1) mas stat.error;pos.parallax float pmRA Proper motion in right ascension (G1) mas/yr pos.pm;pos.eq.ra float e_pmRA Error on pmRA (G1) mas/yr stat.error;pos.pm;pos.eq.ra float pmDE Proper motion in declination (G1) mas/yr pos.pm;pos.eq.dec float e_pmDE Error on pmDE (G1) mas/yr stat.error;pos.pm;pos.eq.dec float SpType Spectral type src.spType char Refs References (G3) meta.ref;pos.frame char