Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..123g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 1, p. 123-130
Astronomy and Astrophysics
Astronomy
35
Abundance, Dwarf Galaxies, Electron Energy, H Ii Regions, Infrared Astronomy, Infrared Spectra, Metallicity, Spiral Galaxies, Astronomical Photometry, Astronomical Spectroscopy, H Alpha Line, H Beta Line, Hydrogen, Nitrogen, Oxygen, Sulfur
Scientific paper
We present new spectroscopic observations of an H II region in the extreme outer disk of the spiral galaxy M101, more than 32 kpc from the nucleus, or 25% farther out than the well-studied giant H II region NGC 5471. From a derived (O III) electron temperature of 13,900 K, we derive log O/H = -4.1, only 10% of the solar value, and smaller than the abundance measured in NGC 5471. Log N/O = -1.49, similar to the values seen in metal-poor dwarf galaxies, while log S/O = -1.74, essentially identical to the solar value, confirming the trend of constant S/O observed in earlier studies. With the inclusion of this new object, the composition gradient in M101 from published spectroscopic observations shows no evidence for either a break in the gradient from 4 to 33 kpc, or a rise in the abundances in the outer parts of the disk.
Garnett Donald R.
Kennicutt Robert C. Jr.
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