Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358..575j&link_type=abstract
Astronomy and Astrophysics, v.358, p.575-582 (2000)
Astronomy and Astrophysics
Astrophysics
12
Line: Formation, Line: Profiles, Turbulence, Stars: Activity, Stars: Chromospheres, Stars: Late-Type
Scientific paper
We discuss the influence of the non-thermal velocity (micro-turbulence) on the formation of chromospheric lines in the atmospheres of late type dwarfs. A review of previous work shows a variety of different approaches to the problem leading to different atmospheric structures and consequently different computed line profiles. In that light, we re-examine the formation of the Hydrogen Balmer lines and Na i D lines using twelve different distributions of the micro-turbulent velocity throughout the atmosphere. Our results show a wide range of possible line shapes. Using the analogy with the solar case and the latest results of the non-thermal component widths as derived from instruments on-board SOHO we model Hα and the Na i D lines in an active dMe star Gl 616.2. Based in part on observations made at Observatoire de Haute Provence (CNRS), France and SOHO
Doyle Gerry J.
Jevremovic Darko
Short Christopher Ian
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