Physics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997taea....1.1003e&link_type=abstract
NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment, vol. 1, p
Physics
Random Numbers, Chromosphere, A Stars, Stellar Rotation, Photometry, Migration
Scientific paper
Rapidly rotating chromospherically active stars appear to be highly spotted. Heretofore we thought that the stars contained only two large spots at any one time. Eaton, Henry, and Fekel proposed that what appear to be two spots is actually the results of -20 to 30 smaller spots randomly distributed on a differentially rotating star. Initial tests of this random spot model showed that it can produce all of the characteristic photometric variations of highly spotted stars. We have tested the random spot theory by measuring the differential rotation of the spots, the lifetimes, and the periods of migration in -20 data sets of 14 years duration in simulated model time. This time span is analogous to real stars that have been observed for about 20 years. Eaton, et al. noted that the spot lifetimes of a star with a differential rotation of k = 0.01 were in the range of 0.27 to 2.46 years with a median of 1.23 years. We recently calculated results of the -20 cases which show that the average differential rotation of the spots is k = 0.012 with a lifetime ranging from 0.26 to 3.56 years with a median of 0.55 years.
Eaton Joel A.
Williams Tamara
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