Six mass-loss stars at 843 MHz

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radio Spectra, Radio Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Winds, Astronomical Maps, Optical Thickness, Planetary Nebulae, Radiant Flux Density

Scientific paper

Radio observations of six mass-loss stars have been made at 843 MHz to establish the low-frequency radio spectra. Five have been detected. Four of the detected stars have an ionized envelope which is optically thick at this frequency; the spectral indices are steeper than the value of 0.6 expected for a spherically symmetric, constant velocity outflow. The fifth star, Eta Carinae, has a flux density and spectrum consistent with an optically thin thermal source.

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