The enhancement of infrared 2.4-μm diffuse radiation centered at about l=335°, b= -1° is examined for its possible origin making use of M-type stars detected on objective-prism plates taken with the Schmidt telescope of the Bosscha Observatory. The surface number density distribution and color excesses of these stars lead us to the conclusion that at least part of the enhancement is ascribed to the low interstellar extinction in that direction. It is further suggested that space becomes more transparent with increasing distance up to at least 4kpc from the sun.
Publications of the Astronomical Society of Japan
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