59 citations · 250 across the 8 of their papers we have counts for
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astro-ph2007★ 59 cited
Butterfly Diagram and Activity Cycles in HR 1099
S. V. Berdyugina, G. W. Henry
We analyze photometric data of the active RS CVn--type star HR 1099 for the years 1975--2006 with an inversion technique and reveal the nature of two activity cycles of 15--16 yr a…
astro-ph2007★ 41 cited
The Sun-like activity of the solar twin 18 Scorpii
Jeffrey C. Hall, Gregory W. Henry, G. Wesley Lockwood
We present the results of 10 yr of complementary spectroscopic and photometric observations of the solar twin 18 Scorpii. We show that over the course of its ~7 year chromospheric…