Dynamic spectra of radio bursts from flare stars
- National Radio Astronomy Observatory, Socorro, NM (USA) Joint Institute for Laboratory Astrophysics, Boulder, CO (USA) Smithsonian Astrophysical Observatory, Cambridge, MA (USA) Colorado Univ., Boulder (USA)
The Arecibo 305 m telescope has been used to observe radio bursts from flare stars at 430 and 1415 MHz. Dynamic spectra of the emission with bandwidths of 10 MHz in the former case and 40 MHz in the latter are recorded. For AD Leo, the microwave burst emission was 100 percent right circularly polarized, achieved brightness temperatures near 10 to the 16th K, was generally broadband in character, but was superposed with finite structures in both frequency and time. Quasi-periodic pulsations were clearly present as well as a sudden reduction feature. For YZ CMi, the emission was 100 percent left circularly polarized and was relatively broadband with fine structures. Instabilities driven by anisotropies in the electron distribution, particularly the loss-cone distribution, are considered to account for the coherent radiation. 55 refs.
- OSTI ID:
- 6807018
- Journal Information:
- Astrophysical Journal; (USA), Vol. 353; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
STELLAR FLARES
RADIOWAVE RADIATION
ANISOTROPY
BRIGHTNESS
COHERENT RADIATION
ELECTRONS
EMISSION SPECTRA
INSTABILITY
LINE WIDTHS
PLASMA
POLARIZATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STELLAR ACTIVITY
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources