Spot activity in the RS CVn binary HR 1099 |
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Authors: | M V Mekkaden A V Raveendran S Mohin |
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Institution: | (1) Indian Institute of Astrophysics, 560034 Bangalore |
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Abstract: | UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available
data shows that the brightness at the light curve maximum increases as the wave amplitude increases, while the brightness
at the light minimum remains almost the same. In terms of the starspot model it implies that there is always a hemisphere
of the active component that is nearly ’saturated’ with spots and that spots occupy a larger fraction of the stellar surface
when the wave amplitude is smaller. The continuous migration attributed to the photometric wave by various authors is far
from certain. The amplitude of the wave has a sharp rise followed by slow decay with a period around 5–6 yr. It is found that
the two-spot model proposed by Dorren and Guinan (1982) is inadequate to describe all the observed photometric peculiarities
of HR 1099. |
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Keywords: | UBV photometry RS CVn variables spot activity |
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