Photometric Imaging with Distributive Solar Analogy

Details Photometric Imaging with Distributive Solar Analogy Photometric Imaging with Distributive Solar Analogy

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ap%26ss.262..411e&link_type=abstract

Astrophysics and Space Science, v. 262, Issue 4, p. 411-439 (1998).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

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 ˜ 1600 K cooler than the T˜ 5000 K of this cool subgiant and cover ˜ %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 ˜ 2040 K cooler covering ˜ % 12.7 area at ± 27°.7 latitudes. Problems of photometric imaging and possible solutions with distributive solar analogy have been discussed.

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