Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..313c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 313-319.
Astronomy and Astrophysics
Astrophysics
15
A Stars, Cosmic Dust, Main Sequence Stars, Stellar Envelopes, Stellar Spectrophotometry, Ultraviolet Spectra, Infrared Spectra, Interstellar Extinction, Mie Scattering, Silicates, Stellar Models, Stellar Temperature
Scientific paper
Ultraviolet low resolution observations of a Herbig Ae star, AB Aur, when compared with a theoretical energy distribution for the same spectral type, show the existence of an anomalous extinction, which is believed to be due to a circumstellar dust envelope surrounding the star. The study of this anomalous extinction allows the author to determine the properties of the grains responsible for it. These properties can then be tested by comparing a computed infrared energy distribution with infrared calibrated observations. It is found that small grains of silicates can be responsible for both ultraviolet extinction and infrared excess near 10 μ, but that the infrared excess between 1 and 4 μ is probably due to a free-free emission mechanism in a 15,000K chromosphere.
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