Chlorine abundances in star-forming regions of the local Universe
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| author | Orte-García, M. Esteban, C. Méndez-Delgado, J. E. García-Rojas, J. Arellano-Córdova, K. Z. Rosales-Ortega, F. F. Reyes-Rodríguez, E. |
| author_facet | Orte-García, M. Esteban, C. Méndez-Delgado, J. E. García-Rojas, J. Arellano-Córdova, K. Z. Rosales-Ortega, F. F. Reyes-Rodríguez, E. |
| contents | Aims. We study the behaviour of Cl abundance and its ratios with respect to O, S and Ar abundances in a sample of more than 200 spectra of Galactic and extragalactic H ii regions and star-forming galaxies (SFGs) of the local Universe. Methods. We use the DEep Spectra of Ionised REgions Database (DESIRED) Extended project (DESIRED-E) that comprises more than 2000 spectra of H ii regions and SFGs with direct determinations of electron temperature ($T_e$). From this database we select those spectra where it is possible to determine the Cl$^{2+}$ abundance and whose line ratios meet certain observational criteria. We calculate the physical conditions and Cl, O, S and Ar abundances in an homogeneous manner for all the spectra. We compare with results of photoionisation models to carry out an analysis of which is the most appropriate $T_e$ indicator for the nebular volume where Cl$^{2+}$ lies, proposing a scheme that improves the determination of the Cl$^{2+}$ abundance. We compare the Cl/O ratios obtained using two different ionisation correction factor (ICF) schemes. We also compare the nebular Cl/O distribution with stellar determinations. Results. Our analysis indicates that the ICF scheme proposed by Izotov et al. (2006) better reproduces the observed distributions of the Cl/O ratio. We find that the log(Cl/O) vs. 12+log(O/H) and log(Cl/Ar) vs. 12+log(Ar/H) distributions are not correlated in the whole metallicity range covered by our objects indicating a lockstep evolution of those elements. In contrast, the log(Cl/S) vs. 12+log(S/H) distribution shows a weak correlation with a slight negative slope. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_17180 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chlorine abundances in star-forming regions of the local Universe Orte-García, M. Esteban, C. Méndez-Delgado, J. E. García-Rojas, J. Arellano-Córdova, K. Z. Rosales-Ortega, F. F. Reyes-Rodríguez, E. Astrophysics of Galaxies Aims. We study the behaviour of Cl abundance and its ratios with respect to O, S and Ar abundances in a sample of more than 200 spectra of Galactic and extragalactic H ii regions and star-forming galaxies (SFGs) of the local Universe. Methods. We use the DEep Spectra of Ionised REgions Database (DESIRED) Extended project (DESIRED-E) that comprises more than 2000 spectra of H ii regions and SFGs with direct determinations of electron temperature ($T_e$). From this database we select those spectra where it is possible to determine the Cl$^{2+}$ abundance and whose line ratios meet certain observational criteria. We calculate the physical conditions and Cl, O, S and Ar abundances in an homogeneous manner for all the spectra. We compare with results of photoionisation models to carry out an analysis of which is the most appropriate $T_e$ indicator for the nebular volume where Cl$^{2+}$ lies, proposing a scheme that improves the determination of the Cl$^{2+}$ abundance. We compare the Cl/O ratios obtained using two different ionisation correction factor (ICF) schemes. We also compare the nebular Cl/O distribution with stellar determinations. Results. Our analysis indicates that the ICF scheme proposed by Izotov et al. (2006) better reproduces the observed distributions of the Cl/O ratio. We find that the log(Cl/O) vs. 12+log(O/H) and log(Cl/Ar) vs. 12+log(Ar/H) distributions are not correlated in the whole metallicity range covered by our objects indicating a lockstep evolution of those elements. In contrast, the log(Cl/S) vs. 12+log(S/H) distribution shows a weak correlation with a slight negative slope. |
| title | Chlorine abundances in star-forming regions of the local Universe |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.17180 |