2007/03/16 by Jeffrey C. Hall, Gregory W. Henry, G. Wesley Lockwood
Physics and Astronomy · #Astronomy and Astrophysical Research #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/513195
published as Astron.J.133:2206-2208,2007
arxiv created 2007/03/16 · openalex publication_date 2007/04/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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 yr chromospheric activity cycle, 18 Sco's brightness varies in the same manner as the Sun's and with a likely total brightness variation of 0.09%, similar to the 0.1% decadal variation in the total solar irradiance.