Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..471i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 2, March 1985, p. 471-478.
Astronomy and Astrophysics
Astrophysics
30
Andromeda Galaxy, Astronomical Photometry, Globular Clusters, Interstellar Extinction, Color-Magnitude Diagram, Electromagnetic Absorption, Galactic Structure
Scientific paper
Three homogeneous sets of photometric data for confirmed and suspected globular clusters in M 31 are used to examine the differential reddening of these objects due to absorption in the disk of M 31. The interstellar medium in the disk of M 31 is found to have an average reddening ratio E(U - B)/E(B - V) = 1.01 + or - 0.11, which is different from the standard value 0.72 of our Galaxy. A more detailed analysis of the colors of the globular clusters in M 31 shows that either there exists a (radial) color gradient for the whole cluster system, or the reddening ratio in the inner part of the disk differs from the outer part where the galactic value is well reproduced. The data cannot distinguish the two effects and therefore, both may be at work. The ratio of total to selective absorption A(V)/E(B-V) in the inner part of the disk of M 31 may also be different from that observed in the solar neighbourhood of the Galaxy. In agreement with previous studies, the NW side of the disk of M 31, which contains more prominent dust features, is confirmed to be the near side. This gives a strong evidence in favor of the conventional view that most spirals are trailing.
Iye Masanori
Richter Otto-Georg
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