Line Profile Shapes in Optical HII Regions

Details Line Profile Shapes in Optical HII Regions Line Profile Shapes in Optical HII Regions

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..37...30y&link_type=abstract

The Messenger, No. 37, P.30, 1984

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Some of the most spectacular astronomical photographs and favourite subjects for popular astronomical slide shows are colour pictures of H 11 regions. Probably every astronomer, both amateur and professional, is familiar with the nebula in Orion, M 42. Shaped like an opened fan, this well-known H I1 region ("H II" is the technical term for ionized hydrogen) appears to be yellow in its bright core and fades out to red and then a faint bluish hue towards the outer perimeter. Of course, the exact colours and size of the Orion Nebula, M 42, is dependent on the type of colour film used and the amount of light gathered. Longer exposure times tend to make the nebula appear larger, expanding outward in the direction of the fan's perimeter. Short exposures of the nebula (or using the eye instead of film) reveal the presence of four bright stars in its core, the "Trapezium", so named because of their relative geometrical positions. These stars cannot be seen on longexposure pictures, because the light from the nebular core saturates the film.

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