139 citations · 394 across the 8 of their papers we have counts for
3 papers · 1 filter
The X-ray cycle in the solar-type star HD 81809
F. Favata, G. Micela, S. Orlando +3
(abridged) Our long-term XMM-Newton program of long-term monitoring of a solar-like star with a well-studied chromospheric cycle, HD 81809 aims to study whether an X-ray cycle is p…
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…
A Survey of Chromospheric Activity in the Solar-Type Stars in the Open Cluster M67
Mark S. Giampapa, Jeffrey C. Hall, Richard R. Radick +1
We present the results of a spectroscopic survey of the Ca II H & K core strengths in a sample of 60 solar-type stars that are members of the solar-age and solar-metallicity open c…