Giant ringlike H II regions and the distance to M101

Details Giant ringlike H II regions and the distance to M101 Giant ringlike H II regions and the distance to M101

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l..29l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 1, 1982, p. L29-L31. Research supported by the Brandi Fund

Astronomy and Astrophysics

Astrophysics

12

Astrometry, Galaxies, H Ii Regions, Nebulae, Astronomical Coordinates, Diameters, Distance

Scientific paper

A new determination of galaxy M101's distance modulus is presented based on the linear diameter of its largest ringlike H II region. Only well-defined rings whose diameters are independent of the filter used were selected. The photographic material shows a mean forbidden S II/H alpha intensity ratio of 0.42; this high value was confirmed and suggests that the gas may be excited by a shock due to supernova or stellar wind. A ringlike H II region was chosen because its diameters are easy to define objectively. The diameter is correlated with the parent galaxy's corrected face-on absolute magnitude and combined with the corrected face-on B-band apparent magnitude and the corrected face-on angular diameter of the galaxy to produce the distance modulus.

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