Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..184p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 2, July 1983, p. 184--190. Research supported by the Norges Almenvite
Astronomy and Astrophysics
Astrophysics
27
Flare Stars, Red Dwarf Stars, Starspots, Stellar Flares, Correlation, Electrophotometry, Light Curve, Stellar Magnitude, Stellar Rotation, Ubv Spectra
Scientific paper
For the purpose of investigating the relation between the occurrence of spots on red dwarf stars and the incidence of stellar flares, the stars EV Lac and YZ CMi were contemporaneously monitored for flare and spot activity in 1979-1981. Direct comparisons and statistical tests are not able to reveal positive relationships between flare frequency or flare energy and the position of the spotted region. Both stars have rotational axis inclinations and spot positions such that the dominating spot region is (partly) visible to the observer at all times. The existence of smaller flare producing active regions elsewhere on the stars cannot be ruled out either. A nonuniqueness problem prevents us from drawing firm conclusions, but suggests that spot/flare relations should be searched for on stars with a flat topped starspot light curve, indicating a certain interval of time during which the spot region rotates completely out of view.
Evans Silvan D.
Kern G. A.
Pettersen Bjorn Ragnvald
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