Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...69..311w&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 69, no. 2, May 1987, p. 311-332. Research supported by the S
Astronomy and Astrophysics
Astrophysics
84
Andromeda Galaxy, Astronomical Photography, Astronomical Photometry, Ubv Spectra, Calibrating, Dwarf Galaxies, Photographic Plates, Sky Radiation
Scientific paper
The authors present full two-dimensional photographic photometry of the nearby spiral galaxy M31 in various colors. They describe the reduction and calibration of the data, as well as a method used to remove the thousands of foreground stars that contaminate the image of the galaxy. Extensive comparisons of these data with published photometric scans show that the blue light intensity of the galaxy is reliable measured out to about 20 kpc radius. Color maps with a typical uncertainty between 0.1 and 0.2 mag were obtained over the main part of the bulge and disk out to 14 kpc radius. Tables listing the intensity and color profiles along the principal axes of the galaxy are presented, together with global profiles in U, B, V, and R out to 24 kpc radius. Two-dimensional color maps, smoothed to a resolution of 40arcsec, show the major dust lanes and a relatively bluer color in the ring of Population I material around 10 kpc radius. The colors are characteristic for an old stellar population. The isophotes of the dwarf elliptical companion NGC 205 are strongly twisted, suggesting tidal interaction between the elliptical and M31.
Kennicutt Robert C. Jr.
Walterbos Reinirus Antonius Maria
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