Soft X-ray emission from the classical nova AT 2018bej

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Volume 689 (September 2024)

A&A, 689 (2024) A335

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Table 3

Spectral parameters of the LTE model fit for AT 2018bej.

	eRASS1	eRASS2	XMM	XMM^(a)	eRASS1^(d)	eRASS2^(d)
N_H, 10²⁰ cm⁻²	$5.88 \pm_{0.16}^{0.17}$ $\[5.88\pm_{0.16}^{0.17}\]$	5.69 ± 0.15	$3.06 \pm_{0.13}^{0.12}$ $\[3.06\pm_{0.13}^{0.12}\]$	5.88^(a)	$5.83 \pm_{0.16}^{0.14}$ $\[5.83\pm_{0.16}^{0.14}\]$
T_eff, kK	$597 \pm_{9}^{4}$ $\[597\pm_9^4\]$	$541 \pm_{14}^{10}$ $\[541\pm_{14}^{10}\]$	631 ± 1	604 ± 1	$578 \pm_{11}^{14}$ $\[578\pm_{11}^{14}\]$	$554 \pm_{11}^{8}$ $\[554\pm_{11}^8\]$
M/M_⊙	$1.25 \pm_{0.08}^{0.09}$ $\[1.25\pm_{0.08}^{0.09}\]$	$0.81 \pm_{0.08}^{0.13}$ $\[0.81\pm_{0.08}^{0.13}\]$	1.39 ± 0.01	1.39 ± 0.01	$1.07 \pm_{0.11}^{0.08}$ $\[1.07\pm_{0.11}^{0.08}\]$
R^(b), km	$8780 \pm_{267}^{476}$ $\[8780\pm_{267}^{476}\]$	$11 001 \pm_{629}^{799}$ $\[11~001\pm_{629}^{799}\]$	$5934 \pm_{77}^{74}$ $\[5934\pm_{77}^{74}\]$	$8038 \pm_{42}^{43}$ $\[8038\pm_{42}^{43}\]$	$9541 \pm_{750}^{601}$ $\[9541\pm_{750}^{601}\]$	$10 393 \pm_{514}^{678}$ $\[10~393\pm_{514}^{678}\]$
L, 10³⁷ erg s⁻¹	$7.0 \pm_{0.6}^{0.8}$ $\[7.0\pm_{0.6}^{0.8}\]$	$7.4 \pm_{1.1}^{1.2}$ $\[7.4\pm_{1.1}^{1.2}\]$	4.0 ± 0.1	6.1 ± 0.1	$7.3 \pm_{1.3}^{1.2}$ $\[7.3\pm_{1.3}^{1.2}\]$	$7.3 \pm_{0.9}^{1.0}$ $\[7.3\pm_{0.9}^{1.0}\]$
log g	$8.33 \pm_{0.04}^{0.06}$ $\[8.33\pm_{0.04}^{0.06}\]$	$7.95 \pm_{0.07}^{0.09}$ $\[7.95\pm_{0.07}^{0.09}\]$	8.72 ± 0.01	8.46 ± 0.01	$8.19 \pm_{0.08}^{0.06}$ $\[8.19\pm_{0.08}^{0.06}\]$	$8.12 \pm_{0.06}^{0.07}$ $\[8.12\pm_{0.06}^{0.07}\]$
Δ log g	$0.41 \pm_{0.05}^{0.06}$ $\[0.41\pm_{0.05}^{0.06}\]$	$0.20 \pm_{0.08}^{0.10}$ $\[0.20\pm_{0.08}^{0.10}\]$	0.70 ± 0.01	0.51 ± 0.01	$0.33 \pm_{0.09}^{0.08}$ $\[0.33\pm_{0.09}^{0.08}\]$	0.33 ± 0.07
A_C, sol	0.24 ± 0.04	$0.20 \pm_{0.04}^{0.05}$ $\[0.20\pm_{0.04}^{0.05}\]$	0.22 ± 0.01	0.27 ± 0.01	0.21 ± 0.04	0.16 ± 0.04
A_N, sol	1.14 ± 0.11	$1.33 \pm_{0.14}^{0.11}$ $\[1.33\pm_{0.14}^{0.11}\]$	1.28 ± 0.03	1.14 ± 0.03	1.30 ± 0.11	1.44 ± 0.11
`cstat` (dof)^(c)	125.00(125)	144.74 (125)	6548.12 (3323)	7019.75 (3324)	272.91 (252)

Notes. ^(a)Hydrogen column density N_H is fixed. ^(b)Distance to the LMC assumed to be 50 kpc (Pietrzyński et al. 2019). ^(c)C-statistics and degrees of freedom of the best value found by the Bayesian analysis. ^(d)eRASS1 and eRASS2 spectra fit simultaneously with a common WD mass, M, parameter.

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