J/AJ/150/147ivo://CDS.VizieR/J/AJ/150/147doi:10.26093/cds/vizier.51500147CDSFoster T.Brunt C.M.2017-09-26T06:41:29Z2016-06-15T15:26:11ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyh-ii-regionsnebulaestellar-distanceWe present a new catalog of spectrophotometric distances and line of sight systemic velocities to 103 HII regions between 90{deg}{<=}l<=195{deg} (longitude quadrants II and part of III). Two new velocities for each region are independently measured using 1 arcmin resolution 21cm HI and 2.6mm^12^CO line maps (from the Canadian Galactic Plane Survey and Five College Radio Astronomy Observatory Outer Galaxy Surveys) that show where gaseous shells are observed around the periphery of the ionized gas. Known and neighboring O- and B-type stars with published UBV photometry and MK classifications are overlaid onto 21cm continuum maps, and those stars observed within the boundary of the HII emission (and whose distance is not more than three times the standard deviation of the others) are used to calculate new mean stellar distances to each of the 103 nebulae. Using this approach of excluding distance outliers from the mean distance to a group of many stars in each HII region lessens the impact of anomalous reddening for certain individuals. The standard deviation of individual stellar distances in a cluster is typically 20% per stellar distance, and the error in the mean distance to the cluster is typically +/-10%. Final mean distances of nine common objects with very long baseline interferometry parallax distances show a 1:1 correspondence. Further, comparison with previous catalogs of HII regions in these quadrants shows a 50% reduction in scatter for the distance to Perseus spiral arm objects in the same region, and a reduction by ~1/2^0.5^ in scatter around a common angular velocity relative to the Sun {Omega}-{Omega}_0_(km/s/kpc). The purpose of the catalog is to provide a foundation for more detailed large-scale Galactic spiral structure and dynamics (rotation curve, density wave streaming) studies in the 2nd and 3rd quadrants, which from the Sun's location is the most favorably viewed section of the Galaxy.2015AJ....150..147Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/147CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/128 : Log of CGPS exposures (Taylor+, 2003-)VII/50 : CO Radial Velocities Toward Galactic H II Regions (Blitz+ 1982)J/ApJ/672/930 : Distant CO clouds in third galactic quadrant (Vazquez+, 2008)J/A+A/397/213 : Galactic HII regions (Paladini+, 2003)J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)http://cadc.hia.nrc.ca/ : Canadian Astronomy Data Centrehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/147https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/147http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/147https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/147https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/147http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/147GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/147/table2 (Final velocities, distances with uncertainties, number of stars and mean total reddening calculated for each HII region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/147/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/147/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/147/table2?GETtext/xml+votable180.050000true316.3141749.66450.005555555555555556Cone search capability for table J/AJ/150/147/table1 (HII regions, HI and ^12^CO velocities, distances with fractional uncertainties, and photometric and spectroscopic information for stars identified as candidates for association with the region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/147/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/147/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/147/table1?GETtext/xml+votable180.050000true316.314249.66450.0055555555555555566/1287 1293 1297 1330 1335 1379 1386 1781 1811 1814 1839 1848 1930 1956 3011 3031 3058 3060 3067 3156 3175 3284 3286 3289 3297 3300 3301 3309 3320 3338 3630 3642 3649 3716 3722 3723 3746 3755 14063 14253 14263 14267 14280 14291 14293 14297 14299 14304 14306 14307 14308 14311 14317 15409 15442 15461 15473 15478 15571 15626 15627 15629 15634 15646 15667 15671 15677 15680 15683 15692 15762 23674 23760 23761 23762 23764 23766 23774 23963 23968 23969 23982 23996 24325 24378 24426 24554 24555https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/147?format=asciidefaultJ/AJ/150/147/notesNotes (comments on ionizing star(s))recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIIIdentifier of the HII regionmeta.id.parentcharNNote identification numbermeta.idintf_Note[r] Flag - Spectral type of star in literature probably wrong; Radio/IR ratio method indicates significantly different spectral type of ionizing sourcemeta.notecharNoteAdditional comments on ionizing star(s)meta.notecharJ/AJ/150/147/table2Final velocities, distances with uncertainties, number of stars and mean total reddening calculated for each HII regionSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintA[A] Additional HII region beyond Canadian Galactic Plane Survey (CGPS; Taylor et al. 2033, cat. VI/128) (1)meta.codecharHIIIdentifier of the HII regionmeta.id;meta.maincharONameOther name for Sh2-208 (Wat 1)meta.idcharGLON[90.23/197.8] Galactic Longitudedegpos.galactic.lonGLAT[-6.29/8] Galactic Latitudedegpos.galactic.latvCO[-103.7/25.6]? Final systemic ^12^CO velocitykm/sspect.dopplerVelocfloatnullablevHI[-102.46/23.68]? Final systemic HI velocitykm/sspect.dopplerVelocfloatnullabler[0.6/10.58] Final heliocentric stellar distancekpcpos.distance;phys.atmol.final;pos.heliocentricfloatdr[0.04/1.99] Uncertainty in the mean distance to the HII region (dr={sigma}_*_/(n_*_)^0.5^) (2)kpcstat.errorfloatNs[1/13] Number of associated stars identifiedmeta.numberintNe[1/4]? Number of excluded starsmeta.numberintnullable<E(B-V)>[0.27/2.415] Mean total reddeningmagphot.color.excessfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/AJ/150/147/table1HII regions, HI and ^12^CO velocities, distances with fractional uncertainties, and photometric and spectroscopic information for stars identified as candidates for association with the regionE(B-V)[0.128/2.415]? The (B-V) color excessmagphot.color.excessfloatnullableVmag[5.06/17.53]? The V band magnitudemagphot.mag;em.opt.VfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIIIdentifier of the HII regionmeta.id.parentcharONameOther name (Sh2-208=Wat 1)meta.id;meta.maincharGLON[90.23/197.82]? Galactic Longitudedegpos.galactic.lonnullableGLAT[-6.29/8]? Galactic Latitudedegpos.galactic.latnullablevCO? The ^12^CO velocitykm/sspect.dopplerVelocfloatnullablen_vCONote for grouped objects (1)meta.notecharvHI[-102.46/23.68]? The HI velocitykm/sspect.dopplerVelocdoublenullablen_vHIName of association (CAS OB4, CAS OB7, CEPOB4, Cep OB2, NGC 1893)meta.notecharvHa[-98.9/24.2]? The H{alpha} velocity (from Fich et al., 1990AJ.....99..622F)km/sspect.dopplerVelocfloatnullable<r>[0.6/10.58]? Mean distance or locationkpcpos.distance;pos.heliocentricfloatnullablef_<r>[exc.] Excluded star (do not contribute to the final distance calculation)meta.codechardr/<r>[0.01/0.33]? Fractional distance uncertainty {Delta}D_r_/<r>stat.errorfloatnullableB-V[-0.06/2.11]? The (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatnullableSpTSpectral typesrc.spTypecharLCLuminosity class (Ia, Iab, Ib, II, III, IV, V, or (V)=assumed LCV)src.class.luminositycharE(B-V)0[-0.33/-0.13]? Reddening corrected (B-V) color excessmagphot.color.excessfloatnullableVMag[-6.9/-0.9]? Reed (2003AJ....125.2531R) absolute V band magnitudemagphys.magAbs;em.opt.VfloatnullableN[1/380] Note identification number (2)meta.noteint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed