Low-frequency excited-carbon radio lines toward Cassiopeia A

Details Low-frequency excited-carbon radio lines toward Cassiopeia A Low-frequency excited-carbon radio lines toward Cassiopeia A

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pazh....8..694e&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Nov. 1982, p. 694-699) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.

Astronomy and Astrophysics

Astronomy

4

Carbon Stars, Cassiopeia A, Radio Spectra, Stellar Spectrophotometry, B Stars, Galactic Radio Waves, Low Frequencies, Nonthermal Radiation, Quantum Numbers, Spectrum Analysis

Scientific paper

A search for the C400 (alpha) radio line in the direction of Cas A indicates that it is absent: in terms of antenna temperature the upper limit T(L)/T(C) less than or equal to 0.002. Comparison of this negative result against successful measurements of the C630 (alpha), C631 (alpha), C640 (alpha) yields parameters for the C II region formed by a hypothetical B star. Nonthermal radio emission is the fundamental factor restricting galactic recombination radio lines to quantum numbers n less than or approximately equal to 900.

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