J/MNRAS/545/F213ivo://CDS.VizieR/J/MNRAS/545/F2137CDSDrew J.E.Greimel R.Eisloeffel J.Raddi R.Wright N.J.2026-03-02T06:25:50Z2026-02-05T09:01:47ZCDS support team

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

cds-question@unistra.frsurveysgalaxy-planesmilky-way-galaxyinfrared-photometryvisible-astronomybroad-band-photometryh-alpha-photometryThe southern Galactic plane has been mapped at optical wavelengths and at under 1-arcsec angular resolution by the VST Photometric Halpha Survey of the Galactic plane and bulge (VPHAS+). Ahead of the release of a uniform photometric calibration of the entire survey footprint, we examine the properties of r<19 VPHAS+ point-source photometry in the third Galactic quadrant. Our interim calibration in g, r and i is compared with that of Pan-STARRS, DECaPS-2 and Skymapper, revealing the need for small gri photometric offsets. Corrections to the Halpha and u magnitude scales are determined via comparison with synthetic photometry. VPHAS+ and its northern counterpart, IGAPS, are shown to closely align across the celestial equator. Aided by Gaia DR3, SIMBAD, and specialist catalogues, we explore selections of: A stars; sub-luminous stars; intrinsically-red luminous stars; young stellar objects; emission-line and OB stars. Attention is drawn to stellar variability as a contaminant in selecting emission line objects via (r - Halpha) excess. The (r-i, r-Halpha) plane appears better for this selection than the alternative (g-i, r-Halpha) plane. Using A stars to map extinction, we show that dust obscuration is greater at negative Galactic latitudes. Like the dust, OB and emission line stars are more frequent below the Galactic equator: at heliocentric distances of up to ~7kpc, these stars' distribution fit in with the known warping of the Galactic plane. An overdensity of B stars, several degrees across and potentially in the Outer Arm, is found around (l,b) = (212.0, -0.6).2026MNRAS.545f2137Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/545/F2137CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/386 : VPHAS+ DR3 survey (Drew+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/545/F2137https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/545/F2137http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/545/F2137https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/545/F2137https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/545/F2137http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/545/F2137GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/545/F2137/vphasq3b (Photometric catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/545/F2137/vphasq3b?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/545/F2137/vphasq3b?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/545/F2137/vphasq3b?GETtext/xml+votable180.050000true99.723171.732180.0055555555555555563/336 338 615 621 4/1301 1303 1358 1377 1379-1380 1382 1385 2455 2493 2495 2528 2530 2536 2538 5/5237 5239 5402 5424 5426 5504-5505 5507 5513 5526 5532 5534 5552-5554 9807 9818-9819 9829 9831 9837 9839 9968-9969 9971 9977 9979 9992 9994 10016 10018 10024 10026 10156 10158 6/20804-20805 20807 20813 20815 20837 20945 20947 20980-20981 20983 20989 21578 21600 21602 21700 21708 21710 21746 21752 21754 22024-22025 22027 22060-22061 22063 22096 22098-22099 22110 22132 22134 22140 22149 22151 22193 22196-22197 22220 22224 22240 39263 39267 39270-39271 39315 39321 39347 39701-39703 39708-39709 39711 39733 39735 39741 39743 39880-39881 39883 39905 39907 39946-39947 39950 39972 39974 39980 39982 40068 40070 40076 40078 40100 40102 40108 40110-40111 40504 40506 40592 40594 40600 40602-40603 40628 40630 40636 40638-40639https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/545/F2137?format=asciiOpticalInfrareddefaultJ/MNRAS/545/F2137/vphasq3bPhotometric cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000.0) (RA)degpos.eq.ra;meta.mainindexedMainTypeSIMBAD main object class (main_type)meta.code.classcharSpTypeSIMBAD spectral type (sp_type)src.spTypecharVPHAS+Display the VPHAS+ data (Drew et al. 2035, Cat. II/386)meta.ref.urlcharMainIdSIMBAD main identifier of object (main_id)meta.id;meta.maincharDEJ2000Declination (J2000.0) (DEC)degpos.eq.dec;meta.mainindexedGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.latdoublemergedClassBand-merged morphological class (mergedClass) (1)src.morph.typefloatimagABi magnitude in the AB system (i_AB)magphot.mag;em.opt.IfloatimagVi magnitude in the Vega system (i_V)magphot.mag;em.opt.Ifloate_imagVPhotometric uncertainty in i magnitude (err_i)magstat.error;phot.magdoubleClassii morphological class (Class_i) (1)src.morph.typefloatAvconfii confidence level (Av_conf_i)meta.code.qualfloaterrbitsii band cumulative warning flag (errbits_i) (2)meta.codeintHamagAB? H-alpha magnitude in the AB system (Ha_AB)magphot.flux;em.line.HalphafloatnullableHamagV? H-alpha magnitude in the Vega system (Ha_V)magphot.flux;em.line.Halphafloatnullablee_HamagAB? photometric uncertainty in H-alpha magnitude (err_Ha)magstat.errordoublenullableClassHa? H-alpha morphological class (Class_Ha) (1)src.morph.type;spect.linefloatnullableAvconfHa? H-alpha confidence level (Av_conf_Ha)meta.code.qualfloatnullableerrbitsHa? H-alpha narrow band cumulative warning flag (errbits_Ha) (2)meta.codeintnullablerrmagABRed-OB r band AB magnitude (rr_AB)magphot.mag;em.opt.RfloatrrmagVRed-OB r band Vega magnitude (rr_V)magphot.mag;em.opt.Rfloate_rrmagABPhotometric uncertainty in red-OB r magnitude (err_rr)magstat.errordoubleClassrrRed-OB r band morphological class (Class_rr)src.morph.typefloatAvconfrrRed-OB r band confidence level (Av_conf_rr)meta.code.qualdoubleerrbitsrrRed-OB r band cumulative warning flag (errbits_rr) (2)meta.codeintrbmagABBlue-OB r band AB magnitude (rb_AB)magphot.mag;em.opt.RfloatrbmagVBlue-OB r band Vega magnitude (rb_V)magphot.mag;em.opt.Rfloate_rbmagABPhotometric uncertainty in blue-OB r magnitude (err_rb)magstat.errordoubleClass_rbBlue-OB r band morphological class (Class_rb) (1)src.morph.typefloatAvconfrbBlue-OB r band confidence level (Av_conf_rb)meta.code.qualdoubleerrbitsrbBlue-OB r band cumulative warning flag (errbits_rb) (2)meta.codeintgmagABg band AB magnitude (g_AB)magphot.mag;em.opt.BfloatgmagVg band Vega magnitude (g_V)magphot.mag;em.opt.Bfloate_gmagABPhotometric uncertainty in g magnitude (err_g)magstat.errordoubleClassgg morphological class (Class_g) (1)src.morph.typefloatAvconfgg band confidence level (Av_conf_g)meta.code.qualdoubleerrbitsgg band cumulative warning flag (errbits_g) (2)meta.codeintumagAB? u band AB magnitude (u_AB)magphot.mag;em.opt.UfloatnullableumagV? u band Vega magnitude (u_V)magphot.mag;em.opt.Ufloatnullablee_umagAB? photometric uncertainty in u magnitude (err_u)magstat.error;pos.cartesian.xdoublenullableClassu? u morphological class (Class_u) (1)src.morph.typefloatnullableAvconfu? u band confidence level (Av_conf_u)meta.code.qualdoublenullableerrbitsu? u band cumulative warning flag (errbits_u) (2)meta.codeintnullable