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The Mg I b triplet and the 4571 Å line as diagnostics of stellar chromospheric activity

Journal
Date Issued
2017
Author(s)
•
•
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DOI
Abstract
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.
Volume
604
Start page
A50
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2017A&A...604A..50S
Rights
open.access
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