Amplitude and frequency variations of oscillation modes in the pulsating DB white dwarf star KIC 08626021 - The likely signature of nonlinear resonant mode coupling

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Volume 585 (January 2016)

A&A, 585 (2016) A22

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Table 1

List of frequencies detected in KIC 08626021.

Id.	Frequency	σ _f	Period	σ_P	Amplitude	σ_A	Phase	σ_Ph	S/N	Comment
	(μHz)	(μHz)	(s)	(s)	(%)	(%)

f_{1, −}	4306.52304	0.00013	232.205886	0.000007	0.867	0.012	0.7987	0.0037	73.4	f_{1, −} in BK14
f_1,0	4309.91490	0.00014	232.023143	0.000007	0.804	0.012	0.5264	0.0040	68.1	f_1,0 in BK14
f_{1, +}	4313.30642	0.00016	231.840705	0.000008	0.701	0.012	0.7885	0.0046	59.3	f_{1, +} in BK14

f_{2, −}	5070.03081	0.00017	197.237460	0.000007	0.641	0.012	0.1521	0.0050	54.3	f_{2, −} in BK14
f_2,0	5073.23411	0.00016	197.112922	0.000006	0.705	0.012	0.0394	0.0046	59.8	f_2,0 in BK14
f_{2, +}	5076.44385	0.00066	196.988291	0.000026	0.167	0.012	0.1462	0.0192	14.1	f_{2, +} in BK14

f_3,0 ^†	3681.80286	0.00028	271.606068	0.000020	0.397	0.012	0.1347	0.0082	33.6	f_3,0 in BK14
f_{3, +} ^†	3685.00937	0.00052	271.369731	0.000038	0.212	0.012	0.4066	0.0153	18.0	f_{3, +} in BK14

f₄	2658.77740	0.00047	376.112721	0.000067	0.233	0.012	0.6147	0.0140	19.7	f₅ in BK14
f₅	4398.37230	0.00068	227.356834	0.000035	0.161	0.012	0.7598	0.0200	13.6	f₇ in BK14
f ₆	3294.36928	0.00079	303.548241	0.000073	0.139	0.012	0.0934	0.0234	11.8	f_4,0 in BK14
f ₇	3677.99373	0.00088	271.887358	0.000065	0.125	0.012	0.6773	0.0260	10.6	f_{3, −} in BK14
f₉	6981.26129	0.00139	143.240592	0.000028	0.079	0.012	0.0105	0.0404	6.7	f₁₁ in BK14

Linear combination frequencies
f₈	6965.30234	0.00090	143.568786	0.000019	0.121	0.012	0.8358	0.0264	10.3	f_{1, −} + f₄ ; f₆ in O13^a
f₁₀	2667.95462	0.00164	374.818969	0.000230	0.067	0.012	0.7489	0.0484	5.7	f₉−f_{1, +}

Frequencies above 5σ detection
f ₁₁ ^⋆	2676.38212	0.00170	373.638725	0.000236	0.065	0.012	0.1443	0.0501	5.5
f₁₂ ^⋆	3290.24565	0.00176	303.928675	0.000163	0.063	0.012	0.0752	0.0519	5.3	f_{4, −} in BK14

Notes.

^(†)

The azimuthal order (m) identification proposed for the doublet comes from a model fit seismic solution (see Giammichele et al., in prep.);

^(⋆)

these frequencies are below 5.6σ (although still higher than 5σ) and could be spurious;

^(a)

Østensen (2013).

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