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2010MNRAS.403.2157H - Mon. Not. R. Astron. Soc., 403, 2157-2166 (2010/April-3)
Observation and modelling of main-sequence star chromospheres - X. Radiative budgets on Gl 867A and AU Mic (dM1e), and a two-component model chromosphere for Gl 205 (dM1).
HOUDEBINE E.R.
Abstract (from CDS):
We find that besides traditional chromospheric lines, many photospheric lines are `filled-in' in the active star spectrum. These differences are, most of the time, weak in absolute fluxes but can be large in terms of differences in the spectral-line equivalent widths.
We calculate the differences in surface fluxes between these two stars for many spectral lines. We derive the radiative budgets for two dM1e stars: Gl 867A and AU Mic. We show that the sum of the numerous spectral lines represents a significant fraction of the radiative cooling of the outer atmosphere. We also re-investigate the cooling from the continuum from the visible to the extreme ultraviolet; we find that earlier predictions of the calculations of Houdebine et al. (Paper V) are in good agreement with observations. We emphasize that if this radiative cooling is chromospheric in character, then in chromospheric model calculations, we should include the radiative losses in Cai, Cri, Vi, Tii and Fei.
From simple constraints, we derive model chromospheres for quiescent and active regions on Gl 205. We show that the quiescent regions have a strong absorption Hαprofile. The plage regions show a filled-in intermediate activity Hαprofile. We also present possible spectral line profiles of quiescent and active regions on Gl 867A.
Abstract Copyright: © 2010 The Author. Journal compilation © 2010 RAS
Journal keyword(s): stars: chromospheres - stars: late-type - stars: magnetic fields
VizieR on-line data: <Available at CDS (J/MNRAS/403/2157): table1a.dat table1.dat>
Simbad objects: 4
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