Reddening of H II regions in M31

Details Reddening of H II regions in M31 Reddening of H II regions in M31

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..386k&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 386-389.

Astronomy and Astrophysics

Astrophysics

11

Andromeda Galaxy, Cosmic Dust, H Ii Regions, Interstellar Extinction, Galactic Structure, H Alpha Line, H Beta Line, Interstellar Matter, Nebulae

Scientific paper

Measured intensities of H-alpha and H-beta lines in the spectra of 22 H II regions in M31 are used to obtain the amount of visual extinction intrinsic to M31. It is found that visual extinction depends on galactocentric distance, decreasing sharply beyond 12 kpc. The ratio of H I to extinction increases outward, implying that the concentration of molecular hydrogen lies in the inner regions.

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