Brackett gamma observations and extinction in giant H II regions in M 101

Details Brackett gamma observations and extinction in giant H II regions in M 101 Brackett gamma observations and extinction in giant H II regions in M 101

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..226s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 2, Sept. 1988, p. 226-232.

Astronomy and Astrophysics

Astrophysics

13

H Alpha Line, H Beta Line, H Ii Regions, Interstellar Extinction, Spiral Galaxies, Abundance, Balmer Series, Cosmic Dust, Emission Spectra, Infrared Spectra, Spectrophotometry

Scientific paper

Br-gamma spectrophotometry of four giant H II regions in M 101 is reported. The Br-gamma fluxes have been compared with previously measured H-alpha, H-beta, and 5-GHz radio continuum fluxes in order to assess reddening and extinction. It is found that the extinctions derived from comparing recombination line fluxes are always less than the extinctions derived from comparing recombination line fluxes to radio continuum fluxes, confirming previous observations of this effect. In addition, the derived extinction increases with increasing comparison wavelength (using H-beta as a baseline), but the sample of H II regions measured here is too small to be conclusive on this effect. Br-gamma fluxes may be used to investigate the wavelength dependence of the albedo of the dust for measuring extinction. The tentative conclusion is that this effect is not very important. The relevance of dust and extinction for the sigma-L relationship for giant extragalactic H II regions is discussed.

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