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The flare activity of AD Leo 1972-1988

Published online by Cambridge University Press:  23 September 2016

B.R. Pettersen ,
K.P. Panov ,
M.S. Ivanova ,
C.W. Ambruster ,
E. Valtaoja ,
L. Valtaoja ,
S. Avgoloupis ,
L.N. Mavridis ,
J.H. Seiradakis  and
S.R. Sundland
...Show all authors
B.R. Pettersen
Affiliation:
1 Institute of Theoretical Astrophysics, university of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo 3, Norway
K.P. Panov
Affiliation:
2 Department of Astronomy and National Astronomical Observatory, Academy of Sciences, 72 Lenin Blvd., Sofia 1184, Bulgaria
M.S. Ivanova
Affiliation:
2 Department of Astronomy and National Astronomical Observatory, Academy of Sciences, 72 Lenin Blvd., Sofia 1184, Bulgaria
C.W. Ambruster
Affiliation:
3 Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085, USA
E. Valtaoja
Affiliation:
4 Metsähovi Radio Research Station, Helsinki University of Technology, SF-02150 Espoo, Finland
L. Valtaoja
Affiliation:
5 Department of Physical Sciences, Turku University, SF-20500 Turku 50, Finland
S. Avgoloupis
Affiliation:
6 Department of Astronomy, University of Thessaloniki, Greece
L.N. Mavridis
Affiliation:
7 Department of Geodetic Astronomy, University of Thessaloniki, Greece
J.H. Seiradakis
Affiliation:
6 Department of Astronomy, University of Thessaloniki, Greece
S.R. Sundland
Affiliation:
1 Institute of Theoretical Astrophysics, university of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo 3, Norway
K. Olah
Affiliation:
8 Konkoly Observatory, P.O. Box 67, H-1525 Budapest XII, Hungary
O. Havnes
Affiliation:
9 Institute of Mathematical and Physical Sciences, university of Tromso, P.O. Box 953, N-9001 Tromso, Norway
Ø. Olsen
Affiliation:
9 Institute of Mathematical and Physical Sciences, university of Tromso, P.O. Box 953, N-9001 Tromso, Norway
J.-E Solheim
Affiliation:
9 Institute of Mathematical and Physical Sciences, university of Tromso, P.O. Box 953, N-9001 Tromso, Norway
T. Aanesen
Affiliation:
9 Institute of Mathematical and Physical Sciences, university of Tromso, P.O. Box 953, N-9001 Tromso, Norway

Abstract

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Time resolved U-filter lightcurves of stellar flares on the dM4e star AD Leo have been measured to determine the flare frequency for individual observing seasons between 1972 and 1988. This report adds new data for 1984-1988. We use the number of flares with energy larger than 10∗∗30 erg, and the number of flare maxima with amplitudes larger than 0.3 as separate parameters to estimate flare frequencies. Chi-square tests do not reveal statistically significant variations of the flare frequency with time for 1972-1988.

Type
I Flare Stars Optical Observations and Flare Statistics
Information
Symposium - International Astronomical Union , Volume 137: Flare Stars in Star Clusters, Association and Solar Vicinity , 1990 , pp. 15 - 18
Copyright
Copyright © Kluwer 1990 

References

Herr, R.B., Opie, D.B., 1987, Inf. Bull. Var. Stars # 3069.Google Scholar
Pettersen, B.R., Coleman, L.A., Evans, D.S., 1984, Ap.J. suppl. 54, 375.CrossRefGoogle Scholar
Pettersen, B.R., Panov, K.P., Sandmann, W.H., Ivanova, M.S., 1986, Astr. Ap. suppl. 66, 235.Google Scholar