The Sun-like activity of the solar twin 18 Scorpii

Details The Sun-like activity of the solar twin 18 Scorpii The Sun-like activity of the solar twin 18 Scorpii

2007-03-16

arxiv.org/abs/astro-ph/0703450v1

Astron.J.133:2206-2208,2007

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/513195

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 activity cycle, 18 Sco's brightness varies
in the same manner as the Sun's and with a likely brightness variation of
0.09%, similar to the 0.1% decadal variation in the total solar irradiance.

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