| |
 |
| Paper: |
Eclipse Mapping the Chromosphere of the M4 Ve Binary CM Dra: First Results |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
2042 |
| Authors: |
Saar, S. H.; Bookbinder, J. A. |
| Abstract: |
We present a preliminary analysis of HST FOS rapid readout spectra (1 s resolution) of Mg ii during two secondary eclipses in the dM4e binary CM Dra. Several flares were observed in both the Mg ii line and in the nearby continuum, which we use to estimate the contribution of flares to atmospheric heating. After removing the flares, we study the shape of the eclipse in Mg ii. The Mg ii lightcurve during the first eclipse shows subtle differences between ingress and egress, implying a non-uniform chromosphere. Larger differences between eclipses suggest that short-term evolution may be significant. We discuss the prospects for inverting the lightcurve to produce maps of Mg ii variations across the stellar surface. Analysis of a FUV spectrum of CM Dra reveals C ii, Si iv and C iv emission for the first time. |
|
|
|
|
|
