On the composition of H II regions in southern galaxies - III. NGC 2997 and 7793

Edmunds, M. G.; Pagel, B. E. J.

doi:10.1093/mnras/211.3.507

Cited by 310 publications

(364 citation statements)

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“…It is based in the oxygen line ratio, R 23 = ([OII]λλ3726, 29 + [OIII]λλ4959, 5007)/Hβ. There are different calibrations using the R 23 ratio, such as those of Dopita & Evans (1986), Edmunds & Pagel (1984), McCall et al (1985), McGaugh (1991) or Zaritsky et al (1994). However, this indicator presents one great disadvantage: the derived abundances depend strongly on the R 23 -O /H calibration (Kewley & Dopita 2002;Cedrés 2003).…”

Section: Introductionmentioning

confidence: 99%

The oxygen abundance gradient in M 101: The reliability of thePmethod

Cedrés

Urbaneja

Cepa

2004

A&A

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Abstract. We present the oxygen abundance determination for 90 H  regions in the inner parts of the grand design galaxy M 101. The abundances were derived employing the P method (Pilyugin 2001a). A comparison is made with previous determinations using another calibration and direct measurements of electron temperature to derive the oxygen abundance. The results show agreement with the abundances derived from the electron temperature method and also show that the older calibration is not as accurate as the P method.

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Section: Introductionmentioning

confidence: 99%

The oxygen abundance gradient in M 101: The reliability of thePmethod

Cedrés

Urbaneja

Cepa

2004

A&A

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“…Imaging spectrophotometry in the main nebular lines has been performed on 65 H II regions in the ringed galaxy NGC 4736. 0/H abundances were derived using the line ratios [0 m]/H/3 and [N n]/[0 in] calibrated by Edmunds & Pagel (1984). We show that the 0/H scatter in the resonance ring of star forming regions is small, no greater than normally expected in the well-mixed ISM of disks of gas-rich galaxies.…”

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confidence: 87%

O/H Abundances in the Ringed Galaxy NGC 4736: Mixing Processes in the Interstellar Medium

Martin

Belley

1996

International Astronomical Union Colloquium

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Abstract. Imaging spectrophotometry in the main nebular lines has been performed on 65 H II regions in the ringed galaxy NGC 4736. 0/H abundances were derived using the line ratios [0 m]/H/3 and [N n]/[0 in] calibrated by Edmunds & Pagel (1984). We show that the 0/H scatter in the resonance ring of star forming regions is small, no greater than normally expected in the well-mixed ISM of disks of gas-rich galaxies. The global 0/H gradient (-0.046 dex/kpc) in the disk of NGC 4736 is shallower than gradients of normal spirals but comparable to gradients observed in weakly barred spirals. This last result could indicate that radial mixing is or was present in NGC 4736. The oval distortion in the central regions can be responsible for this homogenization but it is also possible that a strong bar was present in the past.

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“…Indeed, McCall (1982) and Edmunds & Pagel (1984) models of self-regulated star formation, in which the radiation and mechanical energy produced by stars feeds back into the surrounding ISM and acts to inhibit further star formation. Models of this kind have been explored by Phillips & Edmunds (1991) and Ryder (1995), and appear to do a good job of reproducing the trends of both star formation rate and O/H with surface brightness.…”

Section: Metallicity Vs Surface Brightnessmentioning

confidence: 99%

Element Abundances In Nearby Galaxies

Garnett

2004

Cosmochemistry

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In these lectures I present a highly opinionated review of the observed patterns of metallicity and element abundance ratios in nearby spiral, irregular, and dwarf elliptical galaxies, with connection to a number of astrophysical issues associated with chemical evolution. I also discuss some of the observational and theoretical issues associated with measuring abundances in H II regions and gas and stellar surface densities in disk galaxies. Finally, I will outline a few open questions that deserve attention in future investigations.

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On the composition of H II regions in southern galaxies - III. NGC 2997 and 7793

Cited by 310 publications

References 0 publications

The oxygen abundance gradient in M 101: The reliability of thePmethod

The oxygen abundance gradient in M 101: The reliability of thePmethod

O/H Abundances in the Ringed Galaxy NGC 4736: Mixing Processes in the Interstellar Medium

Element Abundances In Nearby Galaxies

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