Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300

Abstract

(Abridged) We have obtained new spectrophotometric data for 28 HII regions in the spiral galaxy NGC 300, a member of the nearby Sculptor Group. The detection of auroral lines, including [OIII]4363, [SIII]6312 and [NII]5755, has allowed us to measure electron temperatures and direct chemical abundances for the whole sample. We determine for the first time in this galaxy a radial gas-phase oxygen abundance gradient based solely on auroral lines, and obtain the following least-square solution: 12+log(O/H)=8.57-0.41 R/R25, where the galactocentric distance is expressed in terms of the isophotal radius R25. The gradient corresponds to -0.077 dex/kpc, and agrees very well with the galactocentric trend in metallicity obtained for 29 B and A supergiants in the same galaxy. The intercept of the regression for the nebular data virtually coincides with the intercept obtained from the stellar data. This allows little room for depletion of nebular oxygen onto dust grains, although in this kind of comparison we are somewhat limited by systematic uncertainties, such as those related to the atomic parameters used to derive the chemical compositions. We discuss the implications of our result with regard to strong-line abundance indicators commonly used to estimate the chemical compositions of star-forming galaxies, such as R23. By applying a few popular calibrations of these indices based on grids of photoionization models on the NGC 300 HII region fluxes we find metallicities that are higher by 0.3 dex (a factor of two) or more relative to our nebular (Te-based) and stellar ones. We confirm a metallicity dependence of the `softness' parameter eta=(O+/O++)/(S+/S++), in the sense that softer stellar continua are found at high metallicity.

Accepted for publication in The Astrophysical Journal

References in corpus (38)

• The Mass-Metallicity Relation at z~2
• Physical Properties of Wolf-Rayet Stars
• Measured Metallicities at the Sites of Nearby Broad-Lined Type Ic Supernovae and Implications for the SN-GRB Connection
• The influence of chemical composition on the properties of Cepheid stars. II-The iron content
• A cosmic abundance standard: chemical homogeneity of the solar neighbourhood and the ISM dust-phase composition
• The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
• Specific SFR profiles in nearby spiral galaxies: quantifying the inside-out formation of disks
• Metallicities and Physical Conditions in Star-forming Galaxies at z~1.0-1.5
• The Cosmic Evolution of Metallicity from the SDSS Fossil Record
• On the abundance discrepancy problem in HII regions
• The M33 Metallicity Project: Resolving the Abundance Gradient Discrepancies in M33
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• The Electron Temperature Gradient in the Galactic Disk
• A Parallactic Distance of 389 +24/-21 parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations
• The oxygen abundance in the inner HII regions of M101. Implications for the calibration of strong-line metallicity indicators
• Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: II. Control of the \HII Region Parameters
• The metallicity gradient of M 33: chemical abundances of HII regions
• Empirical strong-line oxygen abundance calibrations from galaxies with electron temperature measurements
• VLT spectroscopy of blue supergiants in IC 1613
• Properties of the ionized gas in HH202. II: Results from echelle spectrophotometry with UVES
• Faint emission lines in the Galactic H II regions M16, M20 and NGC 3603
• The temperature and ionization structure of the emitting gas in HII galaxies: Implications for the accuracy of abundance determinations
• The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
• The Araucaria Project. VLT spectra of blue supergiants in WLM: classification and first abundances
• Neon and Argon optical emission lines in ionized gaseous nebulae: Implications and applications
• Cepheids in external galaxies. I. The maser-host galaxy NGC 4258 and the metallicity dependence of P-L and P-W relations
• He~I Emission in the Orion Nebula and Implications for Primordial Helium Abundance
• GMASS Ultradeep Spectroscopy of Galaxies at redshift z~2. I. The stellar metallicity
• Anatomy of a Young Massive Star Cluster: NGC 1569-B
• Enrichment of the ISM by metal-rich droplets and the abundance bias in HII regions
• Physical properties of galaxies and their evolution in the VIMOS VLT Deep Survey. II. Extending the mass-metallicity relation to the range z=0.89-1.24
• The direct oxygen abundances of metal-rich galaxies derived from electron temperature
• The chemical composition of planetary nebulae and HII regions in NGC 3109
• The ionizing radiation from massive stars and its impact on HII regions: results from modern model atmospheres
• Small scale behavior of the physical conditions and the abundance discrepancy in the Orion nebula
• The origin of abundance gradients in the Milky Way: the predictions of different models
• On the electron temperature determination in high-metallicity HII regions
• Star-forming galaxies in SDSS: signs of metallicity evolution

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