Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..449s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 57, May-June 1980, p. 449-464.) Soviet Astronomy, vol. 24, May-June 1980, p. 259-268. Translati
Astronomy and Astrophysics
Astronomy
8
Andromeda Galaxy, Astronomical Photometry, Galactic Nuclei, Ubv Spectra, Brightness, Electrophotometers, Star Distribution
Scientific paper
The photoelectric U, B, V observations of the central region of M81 made in 166 fields at distances of 54-351 arcsec from the center are used to explain the structure of the central condensation of the galaxy. The surface-brightness isophotes can be fit by ellipses varying in axial ratio from 0.9 to 0.6 and in position angle from 70 to 45 deg. The central condensation may include a bar in the form of a triaxial ellipsoid; the nucleus occupies an asymmetric position in this condensation, shifted by 22 arcsec northwest relative to the most distant U isophote at a = 368 arcsec. The apparent eccentricity with respect to the outlying isophotes is caused by distribution of dust, as shown by the colorimetric B - V, U - B color-index profiles reflecting the dust in the central condensation of M31.
Lyutyj V. M.
Sharov Alexander S.
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