J/ApJ/925/76ivo://CDS.VizieR/J/ApJ/925/76doi:10.26093/cds/vizier.19250076CDSAlexeeva S.Zhao G.2025-05-22T20:11:59Z2023-10-02T14:39:53ZCDS support team

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

cds-question@unistra.frchemical-abundancesvisible-astronomyspectroscopygalaxiesh-ii-regionsplanetary-nebulaeMorphological and chemical structures of M33 are investigated with the LAMOST DR7 survey. Physical parameters; extinction; chemical composition of He, N, O, Ne, S, Cl, and Ar (where available); and radial velocities were determined for 110 nebulae (95 HII regions and 15 planetary nebulae) in M33. Among them, 8 planetary nebulae and 55 HII regions in M33 are newly discovered. We obtained the following O abundance gradients: -0.199_-0.030_^+0.030^dex R_25_^-1^ (based on 95 HII regions), -0.124_-0.036_^+0.036^dex R_25_^-1^ (based on 93 HII regions), and -0.207_-0.174_^+0.160^dex R_25_^-1^ (based on 21 HII regions), utilizing abundances from N2 at O3N2 diagnostics and the Te-sensitive method, respectively. The He, N, Ne, S, and Ar gradients resulted in slopes of -0.179_-0.146_^+0.145^, -0.431_-0.281_^+0.282^, -0.171_-0.239_^+0.234^, -0.417_-0.182_^+0.174^, and -0.340_-0.157_^+0.156^, respectively, utilizing abundances from the Te-sensitive method. Our results confirm the existence of the negative axisymmetric global metallicity distribution that is assumed in the literature. We noticed one new WC star candidate and one transition W-R WN/C candidate. The grand-design pattern of the spiral structure of M33 is presented.2022ApJ...925...76Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/925/76CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)V/156 : LAMOST DR7 catalogs (Luo+, 2019)J/ApJ/469/629 : UV-brightest stars of M33 and its nucleus (Massey+ 1996)J/ApJ/505/793 : New WR star in M33 (Massey+, 1998)J/PASP/111/685 : HII regions of M33. II. (Hodge+, 1999)J/A+A/367/498 : Candidate Planetary Nebulae in M 33 (Magrini+, 2001)J/AJ/126/2867 : Red supergiants in Magellanic Clouds (Massey+, 2003)J/ApJ/614/167 : Planetary nebulae in M33 (Ciardullo+, 2004)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)J/ApJS/174/366 : Chandra ACIS survey of M33 (ChaSeM33) (Plucinsky+, 2008)J/ApJ/675/1213 : Abundances in M33 HII regions (Rosolowsky+, 2008)J/ApJ/696/729 : Fluxes and abundances of PNe in M33 (Magrini+, 2009)J/A+A/512/A63 : Abundances of M33 HII regions (Magrini+, 2010)J/ApJ/733/123 : The Wolf-Rayet content of M33 (NGC 598) (Neugent+, 2011)J/ApJ/758/133 : Metallicities of M31 HII regions & PNe (Sanders+, 2012)J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)J/A+A/552/A140 : SEDs of M33 HII regions (Relano+, 2013)J/MNRAS/449/4048 : The H{alpha} rotation curve of M33 (Kam+, 2015)J/A+A/595/A43 : Photometry of 119 HII regions in M33 (Relano+, 2016)J/ApJ/842/97 : Spectroscopic obs. of 413 HII regions in M33 (Lin+, 2017)J/ApJ/923/78 : HII regions in the northern half of M33 (Sawant+, 2021)J/ApJS/252/21 : Multiwavelength survey of WR stars in LMC (Hung+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/925/76https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/925/76http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/925/76https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/925/76https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/925/76http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/925/76GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/925/76/sample (PNe and HII regions in M33 from LAMOST survey (Table 1) and abundances and radial velocities of the nebulae (Table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/925/76/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/925/76/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/925/76/sample?GETtext/xml+votable180.050000true23.2976669430.8158050.0055555555555555566/2154-2155 2240-2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/925/76?format=asciiOpticaldefaultJ/ApJ/925/76/samplePNe and HII regions in M33 from LAMOST survey (Table 1) and abundances and radial velocities of the nebulae (Table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOTypeObject typesrc.classcharNfNumber of flux measurements for this sourcemeta.numberintnullableSeq[1/110] Running sequence numbermeta.idintLAMOSTLAMOST name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryDateDate of observation (UT)time.epochnullableRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainr_OTypeClassification reference or "new" (63 occurrences) (1)meta.notecharn_SeqObject type uncertainty for #84 (2)meta.notecharcHb[0.001/0.73] Extinction coefficient, c(H{beta})phys.absorption.coefffloatne[1/1000]? Electron densitycm**-3phys.density;phys.electronfloatnullableTOIII[7283/10568]? Electron temperature, [OIII] (3)Kphys.temperature.electron;phys.electronintnullableTNII[8237/11232]? Electron temperature, [NII] (3)Kphys.temperature.electron;phys.electronintnullableTOII[6986/6986]? Electron temperature, [OII] (3)Kphys.temperature.electron;phys.electronintnullableO/H(N2)[8/8.6]? Oxygen abundance derived with N2 diagnosticsphys.abundfloatnullableO/H(O3)[8.1/8.6]? Oxygen abundance derived with O3N2 diagnosticsphys.abundfloatnullableO/H[6.3/8.9] Oxygen abundance derived with direct methodphys.abundfloatN/H[6.18/8.1]? Nitrogen abundance derived with direct methodphys.abundfloatnullableNe/H[7.3/8.5]? Neon abundance derived with direct methodphys.abundfloatnullableS/H[5.9/7]? Sulfur abundance derived with direct methodphys.abundfloatnullableCl/H[4.6/5.2]? Chlorine abundance derived with direct methodphys.abundfloatnullableAr/H[4.9/6.8]? Argon abundance derived with direct methodphys.abundfloatnullableHe/H[10/11.2]? Helium abundance derived with direct method from optical recombination linesphys.abund.YfloatnullableRV[-120/114] Radial velocity (4)km/sphys.veloc;pos.heliocentricinte_RV[0/90] RV standard deviationkm/sstat.errorintR[0.29/8.1] Distance to the center of M33 (5)kpcpos.distancefloatR/R25[0.04/1.2] R to R25 ratio (6)stat.fit.omcfloatJ/ApJ/925/76/fluxMeasured fluxes, fluxes corrected for extinction for particular ionsLAMOSTLAMOST name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/110] Running sequence numbermeta.idintlambda[3726.03/9068.6] Wavelength in {AA}0.1nmem.wlfloatFline[0.086/1213] Emission line intensities on scale Hbeta=100phot.fluxdoubleIline[0.076/1213] Emission line intensities on scale Hbeta=100 (corrected for extinction)spect.line.intensitydoubleLineIon identifiermeta.id;spect.linechar