Parallaxes & proper motions of OB stars from Gaia EDR3 J/A+A/645/L8 ivo://CDS.VizieR/J/A+A/645/L8 doi:10.26093/cds/vizier.36459008 CDS Xu Y. Hou L.H. Bian S.B. Hao C.J. Liu D.J. Li J.J. Li Y.J. 2022-12-31T09:02:27Z 2021-01-14T07:41:23Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr ob-stars visible-astronomy trigonometric-parallax proper-motions The astrometric satellite Gaia is expected to significantly increase our knowledge as to the properties of the MilkyWay. The Gaia Early Data Release 3 (Gaia EDR3) provides the most precise parallaxes for many OB stars, which can be used to delineate the Galactic spiral structure. We investigate the local spiral structure with the largest sample of spectroscopically confirmed young OB stars available to date, and we compare it with what was traced by the parallax measurements of masers. A sample consisting of three different groups of massive young stars, including O-B2 stars, O-B0 stars and O-type stars with parallax accuracies better than 10% was compiled and used in our analysis. The local spiral structures in all four Galactic quadrants within ~5kpc of the Sun are clearly delineated in detail. The revealed Galactic spiral pattern outlines a clear sketch of nearby spiral arms, especially in the third and fourth quadrants where the maser parallax data are still absent. These O-type stars densify and extend the spiral structure constructed by using the Very Long Baseline Interferometry (VLBI) maser data alone. The clumped distribution of O-type stars also indicates that the Galaxy spiral structure is inhomogeneous. 2021A&A...645L...8X https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/645/L8 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/350 : Gaia EDR3 (Gaia Collaboration, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/645/L8 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/645/L8 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/645/L8 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/645/L8 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/645/L8 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/645/L8 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/645/L8/table1 (Parallaxes and proper motions of OB stars from Gaia EDR3) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/L8/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/L8/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/L8/table1? 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42549 42556 42562 42564-42565 42604 42608 42618 42623 42630 42632 42657 42672 42691 42721 42760 42768 42779 42781 42800-42801 42829-42830 42832 42838 42843 42851 42853 42901 42924 42932 42959 42969 42980-42981 42994 43008-43009 43011 43036 43038 43048-43049 43051 43055-43057 43060-43062 43064 43072-43073 43075 43080-43081 43083 43086 43088 43104 43107 43126 43130 43137-43140 43148 43170 43211 43235 43238 43267 43286 43294 43305 43307 43310 43338 43357 43383 43391 43407 43414 43416 43429 43431 43458 43460 43523 43538 43542 43607 43619 43642 43756 43778 43796 43852 44100 44305-44306 44312 44366 44378 44386 44389 44469 44616 47105 47113 47121 47148 47179 47259 47304 47525 47593 47627 47637 47644 47652 47657 47782 47787 47793 47800 47845 47855 47868 47928 48013 48072 48074 48537 48769 48862 48867 48882 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/645/L8?format=ascii Optical default J/A+A/645/L8/table1 Parallaxes and proper motions of OB stars from Gaia EDR3 recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Source Name (name_skiff) meta.id;meta.main char GaiaEDR3 Unique source identifier with Gaia EDR3 (EDR3_source_id) meta.id RAICRS Right ascension (ICRS, epoch 2016) (ra) deg pos.eq.ra;meta.main DEICRS Declination (ICRS, epoch 2016) (dec) deg pos.eq.dec;meta.main Plx ? Absolute stellar parallax (parallax) mas pos.parallax float nullable e_Plx ? Standard error of the stellar parallax (parallax_error) mas stat.error;pos.parallax float nullable pmRA ? Proper motion in right ascension direction, pmRA*cosDE (pmra) mas/yr pos.pm;pos.eq.ra float nullable e_pmRA ? Standard error of pmra (pmra_error) mas/yr stat.error;pos.pm;pos.eq.ra float nullable pmDE ? Proper motion in declination direction (pmdec) mas/yr pos.pm;pos.eq.dec float nullable e_pmDE ? Standard error of pmdec (pmdec_error) mas/yr stat.error;pos.pm;pos.eq.dec float nullable SpType Spectral type (spectral_type) src.spType char Simbad Simbad column added by the CDS meta.ref.url char _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra nullable indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec nullable indexed