Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977s%26w....16..395a&link_type=abstract
Sterne und Weltraum, vol. 16, Dec. 1977, p. 395-398. In German.
Astronomy and Astrophysics
Astronomy
Nebulae, Protostars, Stellar Evolution, Variable Stars, Emission Spectra, Hydrogen Clouds, Interstellar Matter, Irregular Variable Stars, Line Spectra, Photosphere, Radio Sources (Astronomy), Spectrum Analysis, Stellar Envelopes, Stellar Luminosity, Stellar Motions, Stellar Structure, Stellar Temperature
Scientific paper
The object considered was discovered as a faint variable in 1866. Brightness variations within the magnitude range from 11.5 to 13.0 and periods of about a week were observed. However, no fixed period was found, and the object was classified as an irregular variable. Photographs indicate that the object is associated with a dense dark nebula which is located at a distance of about 400 light years from the solar system. The dark cloud constitutes an unusually strong source of radio radiation in the centimeter and millimeter range. This radiation is emitted by complex interstellar molecules. Stellar spectra of S Coronae Australis (S CrA) show emission lines of hydrogen, various metal ions, and neutral and ionized helium. S CrA consists of a relatively small starlike nucleus of a mass corresponding to 1 1/2 solar masses and a radius of about 5 solar radii. The temperature of the photosphere is about 4000 K. The nucleus is surrounded by a gas envelope with an extremely low density and a diameter which is 100,000 times as large as the nucleus. The considered object appears to be in the protostar stage of evolution.
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