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| Paper: |
Chromospheric Line Blanketing and the H I Spectrum in dM Stars |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
865 |
| Authors: |
Short, C. I.; Doyle, J. G. |
| Abstract: |
We present non-LTE calculations of the H 1 spectrum in a grid of chromospheric models that represents a dM0 star in which the activity level ranges from quiescent to very active. We investigate three different treatments of the background opacity: 1) continuous opacity only, 2) blanketing due to lines that form in the photosphere below T_min, and 3) blanketing by lines that form throughout the entire outer atmosphere. We show that the predicted peak flux of Hα in very active (dMe) stars is reduced by ~15% by the inclusion of background line opacity. We compare the synthetic Hα profiles with observed Hα spectra of six early dM stars that span a range of activity level. A consistent treatment of line blanketing that includes the effect of the chromospheric and transition region temperature structure in the calculation of background line opacity is necessary for the accurate calculation of Hα in high activity stars. |
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