Optical flares due to X-ray irradiation during major Be X-ray binary outbursts

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Table 1.

BeXRBs’ observed parameters.

	BeXRBs – literature values

Name	Distance	Date ^(a)	L_X ^(b)	P_orb / e / a sin i ^(c)	Spectral class	A_I ^(d)	Refs. ^(e)
	(kpc)	(MJD)	(10³⁸ erg/s)	(d) / – / (ls)
LXP 8.04	50	56675	4	23.97 / 0.037 / 105	O9Ve	0.0885	[I]
SMC X-2	60	57300	7	18.38 / 0.07 / 73.7	O9.5 III–V	0.0735	[II]
SMC X-3	60	57630	25	45.07 / 0.231 / 189	B1–B1.5IV–V	0.066	[III]
SXP 4.78	60	58450	1.8*	20–100 / – / –	B1–3IIIe	0.144	[IV]
SXP 5.05	60	56556	1.3*	17.13 / 0.155 / 142.4	B0.2Ve	0.114	[V]
Swift J0243.6+6124	5.5	58067	20	27.7 / 0.103 / 115.5	O9.5Ve	1.9	[VI]

Notes.

^(a)

Modified Julian date (MJD).

^(b)

Maximum bolometric X-ray luminosity in units of 10³⁸ erg/s. Values marked with * are obtained from soft band using standard corrections (see text).

^(c)

Orbital parameters: Period in d, eccentricity, and projected semimajor axis in light-seconds.

^(d)

Extinction in I band from for the MC sources (Skowron et al. 2021), and J0243 (Reig et al. 2020).

^(e)

Parameter references: [I] Coe et al. (2001), Vasilopoulos et al. (2014), Karaferias et al. (2023), [II] McBride et al. (2008), Townsend et al. (2011), Jaisawal et al. (2023), [III] Tsygankov et al. (2017), [IV] Guillot et al. (2018), Maravelias et al. (2018), Monageng et al. (2019), [V] Coe et al. (2015), and [VI] Wilson-Hodge et al. (2018), Karaferias et al. (2023).

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