Table 5.
Frequencies detected using shape periodograms for Polaris.
| No. | Frequency [d−1] | Period [d] | Amplitude | Identification | ||||
|---|---|---|---|---|---|---|---|---|
| C | g |
 |
Cg | S | ||||
| f1O | 0.25175868(2) | 3.97205765 | – | – | 0.18 | – | 0.22 | First Overtone |
| fX1 | 0.00834699(2) | 119.8036694 | 0.14 | 0.10 | 0.11 | – | 0.11 | fX2/2 |
| fX2 | 0.01670628(2) | 59.85774104 | 0.27 | 0.23 | 0.25 | 0.13 | 0.21 | Additional Signal |
| fX3 | 0.02079552(2) | 48.08727186 | 0.077 | 0.060 | – | 0.12 | 0.064 | Additional Signal † |
| fX4 | 0.02641568(2) | 37.85630784 | 0.067 | 0.11 | 0.069 | 0.046 | 0.063 | Additional Signal † |
| fX5 | 0.02986998(2) | 33.47842574 | 0.053 | 0.063 | 0.042 | 0.10 | 0.066 | Additional Signal † |
| fX6 | 0.03700585(2) | 27.12088438 | 0.12 | 0.14 | 0.084 | 0.10 | 0.072 | Additional Signal † |
| f0 | 0.12587827(2) | 7.94418278 | – | – | – | – | 0.058 | f1O/2 |
| f1 | 0.50156918(2) | 1.99374292 | – | – | – | – | 0.049 | 2f1O |
| f2 | 0.74814635(2) | 1.33663687 | – | – | 0.13 | – | 0.14 | 3f1O |
Notes. Polaris exhibits excess power at low frequencies (P ≳ 20 d), which adds complexity to identifying additional signals. Candidate additional signals based on the global false alarm probability are labelled by a † symbol. fX1 is also significantly detected when taking into account the local envelope of the periodogram (see Sect. 3.1.4).
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