Spectrophotometry of the Orion Nebula. I. On the Nebular Structure

Details Spectrophotometry of the Orion Nebula. I. On the Nebular Structure Spectrophotometry of the Orion Nebula. I. On the Nebular Structure

Apr 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967bott....4...91m&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 4, pp. 91-103 (1967) (http://www.astroscu.unam.mx/bott/)

Astronomy and Astrophysics

Astronomy

20

Spectrophotometry, Hii Regions

Scientific paper

Results of spectrophotometry observations of the Orion Nebula in the wavelength range λ 3600 - 11000 Å are presented. Apparent emission line intensities in various areas of the Huyghenian region have been corrected for interstellar and internebular extinction using a reddening law obtained from the intensity ratio between Paschen and Balmer lines, arising from the same upper level. Self-absorption in the Balmer lines has been shown to be entirely negligible and the intrinsic Balmer decrement found is very close to the value predicted by pure recombination theory. The value of the total absorption is determined from the comparison between the surface brightness obtained with the hydrogen lines with that derived through observations in the radio frequency region. The resulting ratio between total absorption and reddening, R_v, is close to 4.8 in agreement with the results of recent multicolor photometry. In the above derivation, effect of density fluctuations in the nebula have been considered. The same effect on the ratio of the nebular to the auroral lines of the OII ion is given in detail.

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