Physics – Optics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.209..237m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 209, no. 2, p. 237-253
Physics
Optics
4
Flare Stars, Magnetic Flux, Periodic Variations, Solar Flares, Stellar Atmospheres, Temperature Gradients, Cassegrain Optics, Computer Programs, Emission Spectra, Stellar Evolution, Stellar Luminosity
Scientific paper
Sinusoidal variations in both V- and B-bands were detected in some flare stars of the UV Ceti type outside of flares. This detection has confirmed the light variation detection in Johnson's V-band in EV Lac at quiet-state luminosity by Pettersen (1980) with a cyclic period equals about 4.378 d and an amplitude of about 0.07 m. An interpretation of these short cyclic periods is that they are due to intensity modulations from a photospheric spot group as a result of stellar equatorial rotations. A short period of 14 days with an amplitude of 0.099 m was detected in B-band in AD Leo. For the two flare stars, BD+55 deg 1823 and DO Cep in both V- and B-bands, cyclic periods of more than 3 days and less than 17 days with amplitudes more than 0.090 m and less than 0.250 m have been registered. A significant contribution has been found in the flare star EV Lac in both V- and B-bands at its quiescent-state luminosity where the detected cyclic periods are agreed with that which was detected by Pettersen (1980) in the same flare star in Johnson's V-band, about 4 days. Furthermore, we found the same cyclic period in the colour index, B-V (about 4 days) which strengthens starspot phenomenon. This colour index period could not be detected by Pettersen (1980).
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