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• W3036291310 endingPage "2742" @default.
• W3036291310 startingPage "2726" @default.
• W3036291310 abstract "ABSTRACT We determine the radial abundance gradient of helium in the disc of the Galaxy from published spectra of 19 H ii regions and ring nebulae surrounding massive O-type stars. We revise the Galactocentric distances of the objects considering Gaia DR2 parallaxes (Gaia Collaboration 2018) and determine the physical conditions and the ionic abundance of He+ in a homogeneous way, using between 3 and 10 He i recombination lines in each object. We estimate the total He abundance of the nebulae and its radial abundance gradient using four different ionization correction factor (ICF; He) schemes. The slope of the gradient is always negative and weakly dependent on the ICF(He) scheme, especially when only the objects with log(η) &lt; 0.9 are considered. The slope values go from −0.0078 to −0.0044 dex kpc−1, consistent with the predictions of chemical evolution models of the Milky Way and chemodynamical simulations of disc galaxies. Finally, we estimate the abundance deviations of He, O, and N in a sample of ring nebulae around Galactic Wolf–Rayet stars, finding a quite similar He overabundance of about +0.24 ± 0.11 dex in three stellar ejecta ring nebulae." @default.
• W3036291310 created "2020-06-25" @default.
• W3036291310 creator A5011894065 @default.
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• W3036291310 creator A5029681417 @default.
• W3036291310 creator A5031392872 @default.
• W3036291310 date "2020-06-17" @default.
• W3036291310 modified "2023-10-16" @default.
• W3036291310 title "Helium abundances and its radial gradient from the spectra of H ii regions and ring nebulae of the Milky Way" @default.
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• W3036291310 doi "https://doi.org/10.1093/mnras/staa1705" @default.
• W3036291310 hasPublicationYear "2020" @default.
• W3036291310 type Work @default.
• W3036291310 sameAs 3036291310 @default.

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