Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327.1114l&link_type=abstract
Astronomy and Astrophysics, v.327, p.1114-1122 (1997)
Astronomy and Astrophysics
Astrophysics
13
Stars: Ev Lac, Stars: Flare, Activity, Rotation
Scientific paper
We report on a large sample of homogeneous photoelectric data obtained by monitoring the red dwarf flare star EV Lac. The data were collected in 10 years (1967-77) at Catania Astrophysical Observatory on Mt. Etna and consist of 212, 170, and 128 flares detected in the U, B and V band during total monitoring times of 903, 1013, and 864 hours, respectively. The peak luminosity, the total energy emitted, the rise and decay times were measured for each flare. A statistical analysis of this data sample is presented. A well defined phase modulation of the normalized flare occurrence rate in 1970 clearly suggests that, at that time, on EV Lac flaring activity was concentrated at a preferred longitude. Based on observations collected at the ``{\em M.G. Fracastoro
Buemi Carla Simona
Leto Giuseppe
Pagano Isabella
Rodono' Marcello
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