Akademik Veri Yönetim Sistemi
ASTROPHYSICS AND SPACE SCIENCE, cilt.262, sa.4, ss.411-439, 1998 (SCI-Expanded)
The multicolor light curves (UBVRI) of HU Vir have been analyzed to study starspots for epochs 1987 and 1989. The term 'photometric imaging' has been used for predicting cool surface spots by photometric data. Assuming the number of spots and the area are about the same for the two hemispheres, the distributive solar analogy is introduced as a tool to constrain free values of spot parameters into unique values. Therefore, final fitting parameters are claimed unique in a sense that they are independent of free initial guesses. The light and color variations of HU Vir are better explained without polar spots. Finally, the spots are found to be similar to 1600 K cooler than the T-eff similar to 5000 K of this cool subgiant and cover similar to %13.9 of the total surface at +/- 8.0 degrees from the equator for the epoch 1987. The spots at the epoch 1989 are found to be similar to 2040 K cooler covering similar to % 12.7 area at +/- 27 degrees.7 latitudes. Problems of photometric imaging and possible solutions with distributive solar analogy have been discussed.