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Context. The Mg I 4571 {\AA} line and the b triplet are denoted in theliterature as diagnostics of solar and stellar activity since their formationis in the low chromosphere. Aims. To investigate the potential of these fourspectral lines as diagnostics of chromospheric activity in solar-like stars,studying the dependence of the intensity of these lines from local atmosphericchanges by varying atmospheric models and stellar parameters. Methods. Startingwith Next-Gen photospheric models, we build a grid of atmospheric modelsincluding photosphere, chromosphere and transition region and solve theradiative transfer to obtain synthetic profiles to compare with observedspectra of main-sequence, solar like stars with effective temperatures in therange 4800-6400 K, solar gravity and solar metallicity. Results. We find thatthe Mg I 4571 {\AA} line is significantly sensitive to local changes in theatmospheric model around the minimum temperature. Instead, the lines of the btriplet do not show significant responses to changes on the local atmosphericstructure.

The Mg I b triplet and the 4571 {\AA} line as diagnostics of stellar chromospheric activity