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High-Resolution Dynamic Spectrum of a Spectacular Radio Burst from AD Leonis

Published online by Cambridge University Press:  12 April 2016

Meil Abada-Simon ,
Alain Lecacheux ,
Monique Aubier  and
Jay A. Bookbinder
Meil Abada-Simon
Affiliation:
Sterrekundig Instituut, 3508 TA Utrecht, The Netherlands ARPEGES - URA CNRS 1757, Observatoire de Paris, 92190, Meuden, France
Alain Lecacheux
Affiliation:
ARPEGES - URA CNRS 1757, Observatoire de Paris, 92190, Meuden, France
Monique Aubier
Affiliation:
ARPEGES - URA CNRS 1757, Observatoire de Paris, 92190, Meuden, France Université Paris 6, France
Jay A. Bookbinder
Affiliation:
Smithsonian Astrophisical Observatory, Cambridge, MA 02138, USA

Extract

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AD Leonis is a very active, single dMe flare star. The similarities between this type of star and the Sun has led to study their radio radiation, which originates from their corona. The high brightness temperatures and other characteristics of most dMe radio bursts can be attributed to a non-thermal, coherent mechanism: plasma radiation or a cyclotron maser instability (CMI) are both plausible explanations. Even for the strongest burst of AD Leo which reached 940 mJy at 21 cm, it was not possible to discriminate between these two mechanisms (Bastian et al. 1990).

Here we present an intense burst from AD Leo, exhibiting strong spikes for which the CMI seems to be the only reasonable explanation. In Sect. 2 we describe the observations, and in Sect. 3 we give an interpretation for this event.

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 32 - 35
Copyright
Copyright © Springer-Verlag 1995

References

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