Two UV colours of the central part of M 31

Details Two UV colours of the central part of M 31 Two UV colours of the central part of M 31

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..371d&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 371-375. Research sponsored by the Centre National d'Etudes Spatiales

Astronomy and Astrophysics

Astronomy

9

Andromeda Galaxy, Galactic Nuclei, Rocket-Borne Photography, Spaceborne Astronomy, Stellar Evolution, Ultraviolet Spectra, Density Distribution, Far Ultraviolet Radiation, Globular Clusters, Imaging Techniques, Interstellar Extinction, Lyman Spectra, Near Ultraviolet Radiation, Skylab Program, Stellar Luminosity, Stellar Temperature

Scientific paper

Two photographs of the galaxy M 31 have been obtained in the far UV with a Faust rocket experiment and in the near UV with the S 183 experiment aboard Skylab. Only the central part of the galaxy is detected. Reductions provide both the energy received and the angular area over M 31 from which it is emitted. The UV flux is brighter than expected from extrapolation of the visible spectrum. The distribution below 300 A is rather flat and different from previous OAO-2 observations. These results, combined with Lyman continuum flux evaluation, are used to discuss the temperature and the age of the stars which may be responsible for this anomalous UV distribution.

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