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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27076
Title: The Mg I b triplet and the 4571 Å line as diagnostics of stellar chromospheric activity
Authors: SASSO, CLEMENTINA 
ANDRETTA, Vincenzo 
TERRANEGRA, Luciano 
Gomez, Maria Teresa
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 604
First Page: A50
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. <BR /> 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.
URI: http://hdl.handle.net/20.500.12386/27076
URL: https://www.aanda.org/articles/aa/abs/2017/08/aa30676-17/aa30676-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201730676
Bibcode ADS: 2017A&A...604A..50S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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