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Date and Time of the Query: 2019-06-16 T21:16:29 PDT
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For refcode 1994ApJ...426..123G:
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Copyright by American Astronomical Society. Reproduced by permission
1994ApJ...426..123G A VERY METAL POOR H II REGION IN THE OUTER DISK OF M 101 DONALD R. GARNETT Astronomy Department, Univeristy of Minnesota, 116 Church Street, SE, Minneapolis, MN 55455 AND ROBERT C. KENNICUTT, JR. Steward Observatory, University of Arizona Tucson, AZ 85721 Received 1993 June 24; accepted 1993 November 4 ABSTRACT 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 M 101 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. Subject headings: galaxies: individual (M101) - galaxies: spiral - H II regions - ISM: abundances
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