Table 1.
O–C analysis for GSN 069.
| Param. | Odd | Even |
|---|---|---|
| Pmod ∼ 19 d | ||
| Porb [h] | 18.07 ± 0.05 | 18.06 ± 0.03 |
| Ṗorb [10−5] | −3.6 ± 0.9 | −3.2 ± 0.6 |
| Pmod [d] | 19.1 ± 0.1 | 19.24 ± 0.06 |
| Amod [h] | 2.60 ± 0.13 | 2.57 ± 0.08 |
| Pmod ∼ 43–44 d | ||
| Porb [h] | 18.06 ± 0.06 | 18.08 ± 0.04 |
| Ṗorb [10−5] | −3.0 ± 1.2 | −4.1 ± 0.8 |
| Pmod [d] | 43.0 ± 0.7 | 44.2 ± 0.6 |
| Amod [h] | 2.8 ± 0.5 | 2.7 ± 0.3 |
Notes. Porb is in fact the draconitic period which, however, can be taken as an estimate of the orbital period to within few per cent, see text for details. Pmod and Amod are the period and semi-amplitude of the O–C modulation, described here as a sine function. We report 2σ uncertainties on the best-fitting parameters stressing, once again, that the actual uncertainties might be larger due to systematic errors. The corresponding O–C diagrams are shown in Fig. 4.
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