A survey of H II regions in M31

Details A survey of H II regions in M31 A survey of H II regions in M31

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...31..439p&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 31, Mar. 1978, p. 439-461.

Astronomy and Astrophysics

Astrophysics

131

Andromeda Galaxy, H Ii Regions, Hydrogen Ions, Astronomical Catalogs, Brightness, Diameters, Galactic Structure, H Alpha Line, Position (Location)

Scientific paper

An H-alpha survey, using a focal reducer and narrow-band interference filters, has resulted in the detection of nearly a thousand H II regions in M31. The catalog gives their positions, dimensions, and surface brightnesses. The surface brightnesses are on an absolute scale; the photographic measures were calibrated by using photoelectric measures from two different sources. The detection limit reached corresponds to an emission measure of 40 cm (to the -6th power) pc at a temperature of 10,000 K. The general distribution of diameters is highly analogous to that of the Galaxy but differs from that of M33. Some H II regions of M31 and M33, chosen either on account of their large size or high brightness, have been analyzed in detail; their emission measures and excitation parameters have been calculated. The dimensions of the largest H II regions show that the Galaxy is intermediate between M31 and M33, the intensities of the H II regions of M31 being 3.5 times lower than those of M33. Bubble-shaped nebulae have been observed; their dimensions are smaller than those of analogous regions of M33. For M31, the correlation between diameter and distance from the center is less apparent than for M33.

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