Gas-phase Fe/O and Fe/N abundances in Star-Forming Regions. Relations between nucleosynthesis, metallicity and dust

Abstract

In stars, metallicity is usually traced using Fe, while in nebulae, O serves as the preferred proxy. Both elements have different nucleosynthetic origins and are not directly comparable. Additionally, in ionized nebulae, Fe is heavily depleted onto dust grains. We investigate the distribution of Fe gas abundances in a sample of 452 star-forming nebulae with \feiii~$\lambda 4658$ detections and their relationship with O and N. Additionally, we analyze the depletion of Fe onto dust grains in photoionized environments. We homogeneously determine the chemical abundances with direct determinations of electron temperature ($T_e$), considering the effect of possible internal variations of this parameter. We adopt a sample of 300 Galactic stars to interpret the nebular findings. We find a moderate linear correlation ($r=-0.59$) between Fe/O and O/H. In turn, we report a stronger correlation ($r=-0.80$) between Fe/N and N/H. We interpret the tighter correlation as evidence of Fe and N being produced on similar timescales while Fe-dust depletion scales with the Fe availability. The apparently flat distribution between Fe/N and N/H in Milky Way stars supports this interpretation. We find that when 12+log(O/H)<7.6, the nebulae seem to reach a plateau value around $\text{log(Fe/O)}\approx -1.7$. If this trend is confirmed, it would be consistent with a very small amount of Fe-dust in these systems, similar to what is observed in high-z galaxies discovered by the James Webb Space Telescope (JWST). We derive a relationship that allows us to approximate the fraction of Fe trapped into dust in ionized nebulae. If the O-dust scales in the same way, its possible contribution in low metallicity nebulae would be negligible. After analyzing the Fe/O abundances in J0811+4730 and J1631+4426, we do not see evidence of the presence of very massive stars with $M_{\text{init}}>300M_{\odot }$ in these systems.

Accepted for publication in A&A

References in corpus (93)

• Physical Properties of Wolf-Rayet Stars
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• Galactic chemical evolution: Carbon through Zinc
• The chemical make-up of the Sun: A 2020 vision
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• Present-day cosmic abundances. A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models
• The effects of He I 10830 on helium abundance determinations
• New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies
• Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
• The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
• Keck HIRES Spectroscopy of Extragalactic HII Regions: C and O Abundances from Recombination Lines
• CHAOS I: Direct Chemical Abundances for HII Regions in NGC 628
• On the abundance discrepancy problem in HII regions
• First stars IX -Mixing in extremely metal-poor giants. Variation of the 12C/13C, [Na/Mg] and [Al/Mg] ratios
• 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 localized chemical pollution in NGC 5253 revisited: Results from deep echelle spectrophotometry
• The Astrodust+PAH Model: A Unified Description of the Extinction, Emission, and Polarization from Dust in the Diffuse Interstellar Medium
• Nebular spectroscopy: A guide on H II regions and planetary nebulae
• The oxygen abundance in the inner HII regions of M101. Implications for the calibration of strong-line metallicity indicators
• Destruction of Interstellar Dust in Evolving Supernova Remnant Shock Waves
• A First Look at the Abundance Pattern -- O/H, C/O, and Ne/O -- in $z>7$ Galaxies with JWST/NIRSpec
• X-ray binaries as the origin of nebular HeII emission in low-metallicity star-forming galaxies
• Precision abundance analysis of bright HII galaxies
• Carbon and oxygen abundances from recombination lines in low-metallicity star-forming galaxies. Implications for chemical evolution
• Properties of the ionized gas in HH202. II: Results from echelle spectrophotometry with UVES
• The MiMeS Survey of Magnetism in Massive Stars: CNO surface abundances of Galactic O stars
• EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
• Excitation properties of galaxies with the highest [OIII]/[OII] ratios: No evidence for massive escape of ionizing photons
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity
• 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
• Carbon and oxygen in HII regions of the Magellanic Clouds: abundance discrepancy and chemical evolution
• The Galactic radial abundance gradients of C, N, O, Ne, S, Cl and Ar from deep spectra of H II regions
• The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
• Red Supergiant Stars as Cosmic Abundance Probes: KMOS Observations in NGC 6822
• The radial abundance gradient of oxygen towards the Galactic anticentre
• CHAOS VI: Direct Abundances in NGC 2403
• Determination of the primordial helium abundance based on NGC 346 an HII region of the Small Magellanic Cloud
• Gradients of chemical abundances in the Milky Way from HII regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
• A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
• Winds of low-metallicity OB-type stars: HST-COS spectroscopy in IC1613
• Red Supergiants as Cosmic Abundance Probes: The Sculptor Galaxy NGC 300
• Temperature inhomogeneities cause the abundance discrepancy in H II regions
• Ionization correction factors and dust depletion patterns in giant HII regions
• On the Determination of N and O Abundances in Low Metallicity Systems
• Chemical distribution of HII regions towards the Galactic anticentre
• Density biases and temperature relations for DESIRED HII regions
• METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble program. III. Interstellar Depletions, Dust-to-Metal, and Dust-to-Gas Ratios Versus Metallicity
• Carbon and oxygen in metal-poor halo stars
• A new determination of the primordial helium abundance using the analyses of HII region spectra from SDSS
• On the radial abundance gradients of nitrogen and oxygen in the inner Galactic disc
• On the origin of the Galactic thin and thick discs, their abundance gradients and the diagnostic potential of their abundance ratios
• The effects of different Type Ia SN yields on Milky Way chemical evolution
• Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621
• The Galactic Dust-Up: Modeling Dust Evolution in FIRE
• EMPRESS. IV. Extremely Metal-Poor Galaxies (EMPGs) Including Very Low-Mass Primordial Systems with M*=10^4--10^5 M_sun and 2--3% (O/H)_sun: High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-Instability Supernovae
• CHAOS VII: A Large-Scale Direct Abundance Study in M33
• Chemical abundances in 7 metal-poor HII regions and a determination of the primordial helium abundance
• Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars
• The chemical composition of planetary nebulae and HII regions in NGC 3109
• Large Binocular Telescope observations of new six compact star-forming galaxies with [NeV] 3426A emission
• The Te[N II]-Te[O III] temperature relation in H II regions and the reliability of strong-line methods
• The ionizing radiation from massive stars and its impact on HII regions: results from modern model atmospheres
• A novel approach to correcting $T_e$-based mass-metallicity relations
• A new galactic chemical evolution model with dust: results for dwarf irregular galaxies and DLA systems
• About Metallicity Variations in the Local Galactic Interstellar Medium
• Supernova induced processing of interstellar dust: impact of ISM gas density and gas turbulence
• Galaxies with grains: unraveling dust evolution and extinction curves with hydrodynamical simulations
• The Cocoon Nebula and its ionizing star: do stellar and nebular abundances agree?
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy I: HH529II and III
• The homogeneity of chemical abundances in H II regions of the Magellanic Clouds
• The metallicity and distance of NGC 2403 from blue supergiants
• The impact of very massive stars on the chemical evolution of extremely metal-poor galaxies
• On the effects of the Initial Mass Function on Galactic chemical enrichment
• Quantitative spectroscopy of B-type supergiants
• Helium abundances and its radial gradient from the spectra of HII regions and ring nebulae of the Milky Way
• Multiconfiguration Dirac-Hartree-Fock energy levels and transition probabilities for 3d^5 in Fe IV
• New insights on the nebular emission, ionizing radiation and low metallicity of Green Peas from advanced modelling
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy II: HH204
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy III: HH514
• Atomic Data Assessment with PyNeb: Radiative and Electron Impact Excitation Rates for [Fe II] and [Fe III]
• A photoionized Herbig-Haro object in the Orion nebula
• Trading oxygen for iron I: the [O/Fe] -- specific star formation rate relation of galaxies
• Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
• Search for gas accretion imprints in voids: II. The galaxy Ark 18 as a result of a dwarf-dwarf merger
• Nitrogen evolution in the halo, thick disc, thin disc and bulge of the Galaxy
• A Model RRNet for Spectral Information Exploitation and LAMOST Medium-resolution Spectrum Parameter Estimation
• Iron abundances from optical Fe III absorption lines in B-type stellar spectra
• Self-Consistent Grain Depletions and Abundances II: Effects on strong-line diagnostics of extragalactic H II regions
• Monitoring broad emission-line components in spectra of the two low-metallicity dwarf compact star-forming galaxies SBS 1420+540 and J1444+4840
• Realistic Models for Filling and Abundance Discrepancy Factors in Photoionised Nebulae

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