Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150l..15d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 1, Sept. 1985, p. L15-L17.
Astronomy and Astrophysics
Astrophysics
13
Cosmic Dust, Interstellar Matter, Supergiant Stars, Emission Spectra, Grain Size, H Alpha Line, Infrared Spectra, Reflection Nebulae, Temperature Distribution, Visible Spectrum
Scientific paper
An interstellar cloud of warm dust is found in the vicinity of α Cam in IRAS infrared data. The average dust temperature, derived from the ratio of the IRAS 60 and 100 μm fluxes, is about 40K. This is within the range of temperatures expected for dust grains with radii around a = 0.1 - 0.01 μm in the radiation field of α Cam. The entire spectrum can be represented by a discrete distribution of grain sizes of at leat two components. At optical wavelengths a ring of Hα emission is found around the star, with a linear diameter of 25 pc. The star is blowing a bubble in the interstellar medium and is sweeping up a dust cloud. A density of 0.4 cm-3 is derived for the local interstellar medium.
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