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| Paper: |
A New Temperature Determination Using the Fe XVII Emission of Capella |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
787 |
| Authors: |
Beiersdorfer, P.; Gu, M. F.; Lepson, J.; Desai, P. |
| Abstract: |
Typically, the most reliable way to spectroscopically determine the electron temperature is to measure the strength of dielectronic recombination (DR) satellite lines relative to the associated resonance line, IDR/ Ir, as this ratio varies steeply with temperature and does not require assumptions associated with the calculations of ionization equilibria. We have applied this method to the Fe XVII lines, which are very bright in the spectrum of Capella observed with high resolution with Chandra's High Energy Transmission Grating Spectrometer. In particular, we have determined the intensity of the dielectronic satellite lines next to the Fe XVII 2p–3d resonance line, commonly denoted 3C. The atomic data needed to do this are supplied by the Flexible Atomic Code. The temperature, TDR, we have derived from this method is somewhat lower than TDEM, derived from the differential emission measure for Fe XVII. We show that the precision of this method is very high, and we discuss the its limitations. |
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