Balmer line photometry of the 30 Doradus Nebula

Details Balmer line photometry of the 30 Doradus Nebula Balmer line photometry of the 30 Doradus Nebula

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74..280s&link_type=abstract

Astronomy and Astrophysics, vol. 74, no. 3, May 1979, p. 280-293. Research supported by the Conselho Nacional de Pesquisas and

Astronomy and Astrophysics

Astrophysics

10

Astronomical Photometry, Balmer Series, Hydrogen Clouds, Interstellar Extinction, Magellanic Clouds, Nebulae, Astronomical Maps, Data Reduction, Forbidden Transitions

Scientific paper

The 30 Doradus nebula was scanned at 29 strips of constant declination with a square diaphragm of 30 x 30 arcsec by using H alpha and H-beta interference filters. The absolute flux calibration was obtained from observations of six planetary nebulae. Maps, integrated fluxes, and peak brightness values are given. The ratio between the H alpha and H-beta intensities is compared with the theoretical value obtained from recombination theory, to calculate the amount of interstellar reddening. The visual absorption fluctuates rapidly from point to point, but there is a systematic increase from about 0.7 mag to more than 2 mag in the NW to SE direction. Comparing optical with radio data, the mean visual absorption is 1.2 mag.

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