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http://hdl.handle.net/20.500.12386/27076
Titolo: | The Mg I b triplet and the 4571 Å line as diagnostics of stellar chromospheric activity | Autori: | SASSO, CLEMENTINA ANDRETTA, Vincenzo TERRANEGRA, Luciano Gomez, Maria Teresa |
Data pubblicazione: | 2017 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 604 | Da pagina:: | 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 |
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