Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...66..235p&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 66, no. 2, Nov. 1986, p. 235-253. Research supported by McDo
Astronomy and Astrophysics
Astrophysics
7
Astronomical Catalogs, Dwarf Stars, Light Curve, M Stars, Stellar Flares, Random Processes, Stellar Activity, Stellar Spectrophotometry, Temporal Distribution
Scientific paper
Light curves of stellar flares have been measured on the M dwarf AD Leo, using high-speed photometric data from the Bulgarian National Astronomical Observatory and McDonald Observatory. The data are analyzed to study properties of flare activity. A large homogeneous data sample confirms that flares occur randomly in time. Two kinds of flares are present, characterized by their amplitudes and rise times. The decay of flares immediately after maximum is dominated by one cooling mechanism. It is shown that cumulative distributions of flare energy can only be accurately described for large samples. With existing data, only very uncertain determinations can be made for each observing season. The frequency of flares with energies above the level of complete statistical detection is a suitable parameter to use in a search for long-term variability in the flare activity of AD Leo. A weak but cyclic variation indicates a period of about 8 years in the existing data baseline of 14 years.
Ivanova M. S.
Panov Kyril P.
Pettersen Bjorn Ragnvald
Sandmann William H.
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