Late-Type Stars:  Then
Cash et al., 1978, Ap.J., 223, L21.
* Capella was the first extrasolar
stellar coronal source detected in
X-rays (rocket expt:  Catura,
Acton, and Johnson 1975; ANS:
Mewe et al. 1975)
* The HEAO 1 A-2 LEDs were the
first to provide decent spectra at
low energies.
* Cash et al. showed that the spectra
were significantly better fit (c2red ~
1) for models with line emission,
then for simple continuum models
(c2red ~ 5).
* They found T ~ 4 x 106 - 2 x 107 K.