Emission and absorption lines in the photospheric radius expansion bursts of 4U 1820–30

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Volume 696 (April 2025)

A&A, 696 (2025) A139

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Table 1.

Gaussian line parameters.

	Emission line, E₁				Absorption line, E₂				Absorption line, E₃


Burst	E₁	Norm₁^(a)	Width₁	P₁^(b)	E₂	Norm₂^(a)	Width₂	P₂^(b)	E₃	Norm₃^(a)	Width₃	P₃^(b)	χ²(d.o.f.)
#	(keV)		(keV)	(σ)	(keV)		(keV)	(σ)	(keV)		(keV)	(σ)
1	1.052 ± 0.018	0.459 ± 0.111	0.05	5.2					2.957 ± 0.031	0.093 ± 0.024	0.05	5.3	300(237)
2	–	–	–	–					–	–	–	–	276(258)
3	1.051 ± 0.017	0.647 ± 0.199	0.04	5.9					2.977 ± 0.036	0.098 ± 0.045	0.05	3.3	197(199)
4	0.997 ± 0.014	0.422 ± 0.122	0.03	4.3					2.860 ± 0.028	0.127 ± 0.052	0.05	5.9	246(225)
5	0.996 ± 0.024	0.244 ± 0.105	0.03	3.2					2.994 ± 0.077	0.075 ± 0.032	0.08	4.0	256(238)
6	1.046 ± 0.021	0.405 ± 0.106	0.04	5.5					2.932 ± 0.038	0.066 ± 0.031	0.05	3.1	279(236)
7	1.038 ± 0.017	0.398 ± 0.091	0.05	6.1									272(231)
8	1.052 ± 0.012	0.456 ± 0.070	0.05	10.8					2.967 ± 0.044	0.069 ± 0.033	0.05	3.2	280(235)
9	1.028 ± 0.024	0.484 ± 0.138	0.05	5.5	1.625 ± 0.021	0.032 ± 0.011	0.02	4.8	2.894 ± 0.055	0.040 ± 0.011	0.04	2.0	256(224)
10	1.034 ± 0.017	0.406 ± 0.105	0.05	6.5					2.963 ± 0.024	0.083 ± 0.028	0.05	4.3	310(253)
11	1.018 ± 0.022	0.392 ± 0.102	0.05	7.5					3.014 ± 0.051	0.039 ± 0.024	0.03	2.0	245(260)
12	1.043 ± 0.013	0.374 ± 0.099	0.03	5.7					2.863 ± 0.057	0.040 ± 0.022	0.03	2.1	256(251)
13	1.029 ± 0.018	0.327 ± 0.103	0.03	5.1									280(249)
14	1.019 ± 0.014	0.427 ± 0.113	0.06	5.4					2.926 ± 0.023	0.129 ± 0.028	0.08	6.2	245(252)
15	1.053 ± 0.019	0.456 ± 0.115	0.05	6.9					2.927 ± 0.027	0.079 ± 0.033	0.03	4.4	259(244)

Notes.

^(a)

The line normalization of gauss or gabs in units of photons cm⁻² s⁻¹.

^(b)

The significance of the lines were estimated using the Monte Carlo simulations.

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