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• W3098223162 endingPage "678" @default.
• W3098223162 startingPage "654" @default.
• W3098223162 abstract "We present very deep spectrophotometry of 14 bright extragalactic H ii regions belonging to spiral, irregular, and blue compact galaxies. The data for 13 objects were taken with the High Resolution Echelle Spectrometer on the Keck I telescope. We have measured C ii recombination lines in 10 of the objects and O ii recombination lines in eight of them. We have determined electron temperatures from line ratios of several ions, especially those of low ionization potential. We have found a rather tight linear empirical relation between Te([N ii]) and Te([O iii]). We have found that O ii lines give always larger abundances than [O iii] lines. Moreover, the difference of both O++ abundance determinations—the so-called abundance discrepancy factor—is very similar in all the objects, with a mean value of 0.26 ± 0.09 dex, independent of the properties of the H ii region and of the parent galaxy. Using the observed recombination lines, we have determined the O, C, and C/O radial abundance gradients for three spiral galaxies: M33, M101, and NGC 2403, finding that C abundance gradients are always steeper than those of O, producing negative C/O gradients across the galactic disks. This result is similar to that found in the Milky Way and has important implications for chemical evolution models and the nucleosynthesis of C." @default.
• W3098223162 created "2020-11-23" @default.
• W3098223162 creator A5011894065 @default.
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• W3098223162 creator A5050714722 @default.
• W3098223162 creator A5054643718 @default.
• W3098223162 creator A5088851336 @default.
• W3098223162 date "2009-07-06" @default.
• W3098223162 modified "2023-10-13" @default.
• W3098223162 title "KECK HIRES SPECTROSCOPY OF EXTRAGALACTIC H II REGIONS: C AND O ABUNDANCES FROM RECOMBINATION LINES" @default.
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