Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..849d&link_type=abstract
Astronomical Journal, vol. 87, June 1982, p. 849-858. Natural Sciences and Engineering Research Council of Canada
Other
4
Andromeda Galaxy, Astronomical Photometry, Galactic Radiation, Spiral Galaxies, B Stars, Brightness, Color, Cosmic Dust, Energy Distribution, Galactic Nuclei, Oao
Scientific paper
Filter photometry observations from the Orbiting Astronomical Observatory, in six wavelength bands between 1550 and 4250 A, are reported for several positions along the major and minor axes in M31 and at some positions in M33. The spatial resolution is 10 arcmin. The colors along the major axis of M31 within about 20 arcmin of the nucleus are similar to the nucleus; at 45 arcmin the colors are much bluer, indicating a spiral arm population. This behavior is expected from other observations of H I, CO, and early-type stars, which are all concentrated in a ring of material whose inner edge is about 7 kpc (= 35 arcmin) from the nucleus. The center of M33 is bluer than the ring of M31, and the arms of M33 even bluer. There are no colors too blue to be explained (within observational error) by unreddened B stars.
Code Arthur D.
Davis Jared
Mathis John S.
Welch Gary A.
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