Separating the causes of O–C variations in an RR Lyrae star with the Blazhko effect - The case of V1109 Cas

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Table 2.

Fit of a subset of V1109 Cas.

Frequency	Freq.	Amp. ± 0.003	Phase Φ_i/2π
	(c/d)	(mag)
f₀	2.292482	0.442	0.831 ± 0.001
2f₀	4.584964	0.197	0.023 ± 0.003
3f₀	6.877446	0.108	0.241 ± 0.005
4f₀	9.169929	0.054	0.469 ± 0.009
5f₀	11.462410	0.028	0.683 ± 0.018
6f₀	13.754892	0.012	0.888 ± 0.050
7f₀	16.047374	0.010	0.968 ± 0.055
8f₀	18.339856	0.007	0.172 ± 0.072
9f₀	20.632338	0.007	0.298 ± 0.071
10f₀	22.924820	0.005	0.547 ± 0.102
11f₀	25.217302	0.002	0.755 ± 0.240
12f₀	27.509784	0.005	0.871 ± 0.094
13f₀	29.802266	0.002	0.181 ± 0.475
14f₀	32.094748	0.002	0.297 ± 0.256
15f₀	34.387231	0.002	0.554 ± 0.211
f₀ + f_B	2.297836	0.072	0.416 ± 0.007
2f₀ + f_B	4.590313	0.060	0.575 ± 0.008
3f₀ + f_B	6.882795	0.049	0.780 ± 0.009
4f₀ + f_B	9.175277	0.039	0.982 ± 0.013
5f₀ + f_B	11.467759	0.024	0.296 ± 0.018
6f₀ + f_B	13.760241	0.016	0.495 ± 0.029
f₀ − f_B	2.287133	0.056	0.911 ± 0.009
2f₀ − f_B	4.579615	0.063	0.082 ± 0.008
3f₀ − f_B	6.872097	0.050	0.320 ± 0.009
4f₀ − f_B	9.164579	0.036	0.546 ± 0.014
5f₀ − f_B	11.457061	0.025	0.790 ± 0.019
6f₀ − f_B	13.749543	0.016	0.003 ± 0.029

Notes. Data corresponding to the data with starting epoch = HJD 2456547.3269171 (before the apparent break around 2018). We note that the fit contains two independent frequencies, f₀ = 2.292482 ± 0.000001 c/d and f₀ + f_B = 2.297836 ± 0.000007 c/d, yielding a Blazhko frequency of f_B = 0.005348 ± 0.000008 c/d or a Blazhko period P_B = 187.0 ± 0.3 days.

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