文章基本信息

标题：The Mg i b triplet and the 4571 Å line as diagnostics of stellar chromospheric activity
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作者：C. Sasso ; C. Sasso ; V. Andretta 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：604
页码：1-8
DOI：10.1051/0004-6361/201730676
语种：English
出版社：EDP Sciences
摘要：Context. The Mg i 4571 Å line and the b triplet are denoted in the literature as diagnostics of solar and stellar activity since their formation is in the low chromosphere. Aims. We aim to investigate the potential of these four spectral lines as diagnostics of chromospheric activity in solar-like stars, studying the dependence of the intensity of these lines from local atmospheric changes by varying atmospheric models and stellar parameters. Methods. Starting with Next-Gen photospheric models, we build a grid of atmospheric models including photosphere, chromosphere and transition region and solve the radiative transfer to obtain synthetic profiles to compare with observed spectra of main-sequence, solar like stars with effective temperatures in the range 4800–6400 K, solar gravity and solar metallicity. Results. We find that the Mg i 4571 Å line is significantly sensitive to local changes in the atmospheric model around the minimum temperature. Conversely, the lines of the b triplet do not show significant responses to changes on the local atmospheric structure.
关键词：enstars: chromospheresstars: activitystars: solar-type