Line detections in photospheric radius expansion bursts from 4U 1820-303 - Confirmation of previous detections and their temporal evolution

Home

All issues

Volume 694 (February 2025)

A&A, 694 (2025) A266

Full HTML

Open Access

Table 2.

Results of the continuum modelling for all bursts with the f_a model in XSPEC.

#	ObsID	Date	Γ	Norm	kT_BB	Radius	L_X	C-STAT
1	1050300108	2017-08-29T08:53:16.07	$1 . 64_{- 0.05}^{+ 0.05}$ $1.64^{+0.05}_{-0.05}$	$5 . 8_{- 0.3}^{+ 0.3}$ $5.8^{+0.3}_{-0.3}$	$0 . 59_{- 0.03}^{+ 0.03}$ $0.59^{+0.03}_{-0.03}$	$0 . 89_{- 0.08}^{+ 0.09}$ $0.89^{+0.09}_{-0.08}$	6.3 ± 0.3	389.7 (2.6)
2	1050300108	2017-08-29T11:03:40.41	$1 . 49_{- 0.05}^{+ 0.05}$ $1.49^{+0.05}_{-0.05}$	$5 . 6_{- 0.3}^{+ 0.3}$ $5.6^{+0.3}_{-0.3}$	$0 . 75_{- 0.08}^{+ 0.09}$ $0.75^{+0.09}_{-0.08}$	$0 . 46_{- 0.07}^{+ 0.09}$ $0.46^{+0.09}_{-0.07}$	7.6 ± 0.4	342.6 (0.3)
3	1050300109	2017-08-30T05:19:44.92	$1 . 81_{- 0.05}^{+ 0.06}$ $1.81^{+0.06}_{-0.05}$	$6 . 5_{- 0.3}^{+ 0.3}$ $6.5^{+0.3}_{-0.3}$	$0 . 62_{- 0.03}^{+ 0.03}$ $0.62^{+0.03}_{-0.03}$	$0 . 90_{- 0.07}^{+ 0.07}$ $0.90^{+0.07}_{-0.07}$	5.7 ± 0.2	333.8 (0.6)
4	1050300109	2017-08-30T08:06:51.31	$1 . 67_{- 0.05}^{+ 0.06}$ $1.67^{+0.06}_{-0.05}$	$6 . 6_{- 0.3}^{+ 0.3}$ $6.6^{+0.3}_{-0.3}$	$0 . 69_{- 0.05}^{+ 0.05}$ $0.69^{+0.05}_{-0.05}$	$0 . 64_{- 0.06}^{+ 0.07}$ $0.64^{+0.07}_{-0.06}$	6.7 ± 0.3	403.4 (3.1)
5	1050300109	2017-08-30T14:27:36.30	$1 . 68_{- 0.05}^{+ 0.06}$ $1.68^{+0.06}_{-0.05}$	$6 . 4_{- 0.3}^{+ 0.3}$ $6.4^{+0.3}_{-0.3}$	$0 . 67_{- 0.04}^{+ 0.05}$ $0.67^{+0.05}_{-0.04}$	$0 . 68_{- 0.07}^{+ 0.08}$ $0.68^{+0.08}_{-0.07}$	6.3 ± 0.4	353.9 (1.1)
6	2050300104	2019-06-07T06:56:50.46	$2 . 31_{- 0.09}^{+ 0.10}$ $2.31^{+0.10}_{-0.09}$	$5 . 9_{- 0.3}^{+ 0.3}$ $5.9^{+0.3}_{-0.3}$	$0 . 56_{- 0.02}^{+ 0.02}$ $0.56^{+0.02}_{-0.02}$	$1 . 21_{- 0.06}^{+ 0.07}$ $1.21^{+0.07}_{-0.06}$	4.3 ± 0.1	398.1 (5.3)
7	2050300108	2019-06-12T20:00:34.79	$2 . 59_{- 0.11}^{+ 0.13}$ $2.59^{+0.13}_{-0.11}$	$4 . 5_{- 0.3}^{+ 0.3}$ $4.5^{+0.3}_{-0.3}$	$0 . 48_{- 0.01}^{+ 0.01}$ $0.48^{+0.01}_{-0.01}$	$1 . 51_{- 0.08}^{+ 0.08}$ $1.51^{+0.08}_{-0.08}$	3.3 ± 0.1	351.5 (4.8)
8	2050300110	2019-06-14T07:41:08.28	$3 . 62_{- 0.21}^{+ 0.26}$ $3.62^{+0.26}_{-0.21}$	$4 . 1_{- 0.4}^{+ 0.4}$ $4.1^{+0.4}_{-0.4}$	$0 . 36_{- 0.01}^{+ 0.01}$ $0.36^{+0.01}_{-0.01}$	$2 . 36_{- 0.16}^{+ 0.16}$ $2.36^{+0.16}_{-0.16}$	2.8 ± 0.1	290.5 (5.9)
9	2050300119	2019-06-26T07:21:30.42	$2 . 63_{- 0.11}^{+ 0.13}$ $2.63^{+0.13}_{-0.11}$	$4 . 9_{- 0.3}^{+ 0.4}$ $4.9^{+0.4}_{-0.3}$	$0 . 48_{- 0.01}^{+ 0.01}$ $0.48^{+0.01}_{-0.01}$	$1 . 87_{- 0.08}^{+ 0.08}$ $1.87^{+0.08}_{-0.08}$	4.1 ± 0.1	390.1 (6.7)
10	2050300119	2019-06-26T18:21:25.29	$2 . 00_{- 0.06}^{+ 0.07}$ $2.00^{+0.07}_{-0.06}$	$6 . 3_{- 0.3}^{+ 0.3}$ $6.3^{+0.3}_{-0.3}$	$0 . 57_{- 0.02}^{+ 0.02}$ $0.57^{+0.02}_{-0.02}$	$1 . 10_{- 0.07}^{+ 0.07}$ $1.10^{+0.07}_{-0.07}$	5.0 ± 0.1	372.4 (2.9)
11	2050300124	2019-07-01T14:05:57.58	$2 . 07_{- 0.07}^{+ 0.07}$ $2.07^{+0.07}_{-0.07}$	$6 . 0_{- 0.3}^{+ 0.3}$ $6.0^{+0.3}_{-0.3}$	$0 . 54_{- 0.02}^{+ 0.02}$ $0.54^{+0.02}_{-0.02}$	$1 . 26_{- 0.07}^{+ 0.08}$ $1.26^{+0.08}_{-0.07}$	4.7 ± 0.1	398.5 (4.3)
12	4680010101	2021-05-02T14:35:35.51	$2 . 34_{- 0.10}^{+ 0.11}$ $2.34^{+0.11}_{-0.10}$	$5 . 8_{- 0.3}^{+ 0.3}$ $5.8^{+0.3}_{-0.3}$	$0 . 59_{- 0.02}^{+ 0.02}$ $0.59^{+0.02}_{-0.02}$	$1 . 20_{- 0.05}^{+ 0.06}$ $1.20^{+0.06}_{-0.05}$	4.5 ± 0.1	407.9 (5.8)

Notes. The best-fit spectral parameters of the burst peak emission for the f_a model that also accounts for the underlying persistent emission. The labels are the same as in Table 1. The bolometric luminosity is computed between 0.2 and 20 keV, assuming a distance of 8 kpc and expressed in units of 10³⁸ erg s⁻¹. The radius parameter is expressed in units of 10² km. The errors on the best-fit parameters are given at the 90% confidence levels.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.