The new intermediate long-bursting source XTE J1701-407

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Volume 496 / No 2 (March III 2009)

A&A, 496 2 (2009) 333-342

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Table 4:

Type-I X-ray burst-ignition conditions^a.
Model	$\dot m^b$	$Z_{\rm CNO}$	X₀^c	$Q_{\rm b}$	$y_{{\rm ign},9}$	$T_{{\rm ign},8}$	$\langle X\rangle$	$X_{\rm b}$	$Q_{\rm nuc}$	E₄₀	$\Delta t$
	$(\%~\dot m_{\rm Edd})$										(days)
Pure helium accretion^d
1	2.2	0.02	0	0.5	1.8	1.4	0	0	1.6	3.4	6.5
2	2.2	0.02	0	0.3	7.4	1.2	0	0	1.6	14	27
3	2.2	0.02	0	0.7	0.84	1.5	0	0	1.6	1.6	3.1
Accretion hydrogen-rich material
4	2.2	0.02	0.7	0.5	0.13	2.0	0.38	0.07	3.1	0.49	0.48
5	0.69	0.02	0.7	0.5	1.6	1.4	0.01	0	1.64	3.2	19
6	2.2	0.001	0.7	0.1	0.67	1.7	0.62	0.54	4.1	3.3	2.5
7	2.2	0.001	0.7	0.5	0.53	1.8	0.63	0.43	4.1	2.7	2.0

^a Models 1, 5, and 6 provide a good match to the observed burst energy of $3.5\times 10^{40}\ {\rm erg}$ . In addition, models 1 and 6 have an accretion rate that matches the value inferred from the persistent luminosity; ^b we define $\dot m_{\rm Edd}=1.8\times 10^5\ {\rm g\ cm^{-2}\ s^{-1}}$ , the local accretion rate onto a $1.4\ M_\odot$ , $R=11.2\ {\rm km}$ neutron star, which infers an accretion luminosity equal to the empirically-derived Eddington luminosity $3.8\times 10^{38}\ {\rm erg\ s^{-1}}$ from Kuulkers et al. (2003); ^c the hydrogen mass fractions are: in the accreted material X₀, at the base of the layer at ignition $X_{\rm b}$ , and the mass-weighted mean value in the layer at ignition $\langle X\rangle$ ; ^d note that the ignition conditions for pure helium accretion do not depend on the choice of $Z_{\rm CNO}$ .

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