Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..363l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 363-368.
Astronomy and Astrophysics
Astrophysics
34
Dwarf Stars, Flare Stars, M Stars, Radio Stars, Brightness Temperature, Circular Polarization, Radio Bursts, Spikes
Scientific paper
This paper presents Arecibo observations of highly lefthand circularly polarized (up to 100%) spikes from AD Leonis at 1415 MHz with rise times τR ≤ 5 ms. These rise times provide an upper limit of L ≤ 1.5x108cm, and a lower limit to TB ≥ 1016K for a symmetric emitter. Some of the spikes were part of a quasi-periodic train of spikes with a mean periodicity of τP = 32±5 ms and a total duration of τD = 150 ms. This spike train was itself one pulse in a quasi-periodic sequence of pulsations with a mean periodicity of τP = 3.2±0.3 s and total duration of τD = 25 s; the pulsations were superposed upon a longer lasting (50 s) burst. The high brightness temperatures and high circular polarization of the spikes are interpreted in terms of coherent maser emission processes. One possible explanation of the quasi-periodic pulsations and spikes is magnetoacoustic oscillations in a coronal loop that modulate the maser action.
Lang Kenneth R.
Willson Robert F.
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