Low-frequency excited-carbon radio lines toward Cassiopeia A

Astronomy and Astrophysics – Astronomy

Scientific paper

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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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