Table 2
Best-fitting parameters for the X-ray spectra of Kepler-63.
| Date | Model | kT1 | kT2 | log EM1 | log EM2 | kTav | FX |  (d.o.f) |
|---|---|---|---|---|---|---|---|---|
| [keV] | [keV] | [cm−3] | [cm−3] | [keV] | 10−14 [erg cm−2 s−1] | |||
| 0.3–2. keV | ||||||||
| 2014-09-28 | 1-T APEC | 0.60 ± 0.12 | \ | 51.92 ± 0.13 | \ | \ | 2.27 ± 0.16 | 0.74 (27) |
| 2-T APEC | 0.50 ± 0.13 | 1.08 ± 0.47 | 51.84 ± 0.41 | 51.45 ± 0.80 | 0.67 ± 0.18 | 2.43 ± 0.22 | 0.64 (25) | |
| 2019-05-05 | 1-T APEC | 0.79 ± 0.29 | \ | 51.83 ± 0.34 | \ | \ | 1.91 ± 0.35 | 0.65 (11) |
| 2019-08-21 | 1-T APEC | 0.82 ± 0.18 | \ | 51.80 ± 0.22 | \ | \ | 1.75 ± 0.26 | 1.39 (13) |
| 2-T APEC | 0.27 ± 0.09 | 1.04 ± 0.41 | 51.79 ± 0.47 | 51.66 ± 0.49 | 0.61 ± 0.18 | 2.29 ± 0.28 | 0.43 (10) | |
| 2019-10-31 | 1-T APEC | 0.74 ± 0.20 | \ | 51.92 ± 0.30 | \ | \ | 2.38 ± 0.38 | 0.81 (7) |
| Simultaneous fit (2019) | 2-T APEC | 0.31 ± 0.16 | 0.94 ± 0.23 | 51.59 ± 0.63 | 51.72 ± 0.38 | 0.67 ± 0.15 | 1.93 ± 0.19 | 0.75 (32) |
Notes. The spectral model used for all spectra is the 1-T APEC model, with the exception of the observations of September 2014, August 2019, and the simultaneous fitting of all observations obtained in 2019: in these latter cases, a 2-T APEC model was used as well. For both spectral models, the metal abundances are kept frozen at 0.3 Z⊙. The associated uncertainties are obtained with the error command of xspec. In the last column, 
stands for the reduced χ2 and d.o.f are the degrees of freedom.
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