Parallaxes and Proper Motions of OB stars J/A+A/616/L15 ivo://CDS.VizieR/J/A+A/616/L15 doi:10.26093/cds/vizier.36169015 CDS Xu Y. Bian S.B. Reid M.J. Li J.J. Zhang B. Yan Q.Z. Dame T.M.,Menten K.M. He Z.H. Liao S.L. Tang Z.H. 2018-12-19T07:38:45Z 2018-08-24T15:32:13Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr ob-stars milky-way-galaxy visible-astronomy trigonometric-parallax proper-motions The Gaia mission has released the second data set (Gaia DR2), which contains parallaxes and proper motions for a large number of massive, young stars. We investigate the spiral structure in the solar neighborhood revealed by Gaia DR2 and compare it with that depicted by VLBI maser parallaxes. We examined three samples with different constraints on parallax uncertainty and distance errors and stellar spectral types: (1) all OB stars with parallax errors less than 10%; (2) only O-type stars with 0.1mas errors imposed and with parallax distance errors less than 0.2kpc; (3) only O-type stars with 0.05 mas errors imposed and with parallax distance errors less than 0.3kpc. In spite of the significant distance uncertainties for stars in DR2 beyond 1.4kpc,the spiral structure in the solar neighborhood demonstrated by Gaia agrees well with that illustrated by VLBI maser results. The O-type stars available from DR2 extend the spiral arm models determined from VLBI maser parallaxes into the fourth Galactic quadrant, and suggest the existence of a new spur between the Local and Sagittarius arms. 2018A&A...616L..15X https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/616/L15 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/345 : Gaia DR2 (Gaia Collaboration, 2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/616/L15 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/616/L15 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/616/L15 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/616/L15 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/616/L15 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/616/L15 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/616/L15/table2 (Parallaxes and Proper Motions of O stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/616/L15/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/616/L15/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/616/L15/table2? GET text/xml+votable 180.0 50000 true 0.4452831 67.5069728 0.005555555555555556 Cone search capability for table J/A+A/616/L15/table1 (Parallaxes and proper motions of OB stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/616/L15/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/616/L15/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/616/L15/table1? 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Should Not be used for identification. meta.record int Name Source Name (Name) meta.id;meta.main char Source Unique source identifier with Gaia DR2 (DR2_source_id) meta.id RAdeg Right ascension (ICRS, epoch 2015.5) (ra) deg pos.eq.ra DEdeg Declination (ICRS, epoch 2015.5) (dec) deg pos.eq.dec plx ? Absolute stellar parallax (parallax) mas pos.parallax.trig double nullable e_plx ? Standard error of the stellar parallax (parallax_error) mas stat.error;pos.parallax double nullable pmRA ? Proper motion in right ascension direction (pmra) mas pos.pm;pos.eq.ra double nullable e_pmRA ? Standard error of pmra (pmra_error) mas stat.error;pos.pm;pos.eq.ra double nullable pmDE ? Proper motion in declination direction (pmdec) mas pos.pm;pos.eq.dec double nullable e_pmDE ? Standard error of pmdec (pmdec_error) mas stat.error;pos.pm;pos.eq.dec double nullable vlsr ? LSR velocity (vlsr) km/s phys.veloc;pos.lsr float nullable e_vlsr ? Standard error of vlsr (velocity_error) km/s stat.error;phys.veloc;pos.lsr float nullable SpType Spectral type (spectral_type) src.spType char Simbad Simbad column added by the CDS meta.ref.url char _RA Right Ascension (J2000) from SIMBAD (not part of the original data) deg pos.eq.ra;meta.main _DE Declination (J2000) from SIMBAD (not part of the original data) deg pos.eq.dec;meta.main
J/A+A/616/L15/table1 Parallaxes and proper motions of OB stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Source Name (Name) meta.id;meta.main char Source Unique source identifier with Gaia DR2 (DR2_source_id) meta.id RAdeg Right ascension (ICRS, epoch 2015.5) (ra) deg pos.eq.ra DEdeg Declination (ICRS, epoch 2015.5) (dec) deg pos.eq.dec plx ? Absolute stellar parallax (parallax) mas pos.parallax.trig double nullable e_plx ? Standard error of the stellar parallax (parallax_error) mas stat.error;pos.parallax double nullable pmRA ? Proper motion in right ascension direction (pmra) mas pos.pm;pos.eq.ra double nullable e_pmRA ? Standard error of pmra (pmra_error) mas stat.error;pos.pm;pos.eq.ra double nullable pmDE ? Proper motion in declination direction (pmdec) mas pos.pm;pos.eq.dec double nullable e_pmDE ? Standard error of pmdec (pmdec_error) mas stat.error;pos.pm;pos.eq.dec double nullable vlsr ? LSR velocity (vlsr) km/s phys.veloc;pos.lsr float nullable e_vlsr ? Standard error of vlsr (velocity_error) km/s stat.error;phys.veloc;pos.lsr float nullable SpType Spectral type (spectral_type) src.spType char Simbad Simbad column added by the CDS meta.ref.url char _RA Right Ascension (J2000) from SIMBAD (not part of the original data) deg pos.eq.ra;meta.main _DE Declination (J2000) from SIMBAD (not part of the original data) deg pos.eq.dec;meta.main