The rapid evolution of the exciting star of the Stingray nebula

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Table 2

Interstellar reddening of SAO 244567.

Year	Telescope	E_{B − V}	Method

1980	61 cm ESO	0.18	UBV photometry^d
1988	IUE	0.18	LMC reddening law^a
1988		0.20	Seaton reddening law^c
1990	1.5 m ESO	0.18	H β line intensity^b
		0.18	H β line intensity^c
		0.14	Balmer decrement³
1992	1.5 m ESO	0.13	H β line intensity^b
1993	IUE	0.17	LMC reddening law^a
1994	IUE	0.19	LMC reddening law^a
1995	IUE	0.20	LMC reddening law^a
1996	IUE	0.20	LMC reddening law^a
1997	FOS	0.14	LMC reddening law^a
1999	STIS	0.18	LMC reddening law^a
2002	FUSE	0.11	Fitzpatrick reddening law^a
2006	FUSE	0.11	Fitzpatrick reddening law^a
2011	1.9 m SAAO	0.24	H β line intensity^b

Notes. Typical errors for E_{B − V} are ± 0.02.

^(a)

This work.

^(b)

Arkhipova et al. (2013).

^(c)

Parthasarathy et al. (1993).

^(d)

Kozok (1985a).

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