Astronomy & Astrophysics

Table 1: Optical and near-infrared broad-band photometric parameters of Wray 977 collected from literature; the infrared fluxes were observed with ISO. The fluxes are dereddened using the extinction law of Mathis (1990) and E(B-V)=1.9. (1) Bord et al. (1976); (2) Hammerschlag-Hensberge et al. (1976); (3) Van Dishoeck & Black (1989); (4) Coe et al. (1997); (5) Glass (1979); (6) ISO (see Sect. 2.2).
Passband $\lambda$ Mag $f_{\nu}$ $A_{\lambda}$ (mag) $f_{\nu}$ (cor)

( $\mu$ m) (Jy) (R_V=3.1) (Jy)

U (1) 0.365 13.01 0.012 9.18 55.23

B (1) 0.44 12.59 0.041 7.80 53.87

V (2) 0.55 10.83 0.177 5.89 40.26

I (3) 0.90 7.6 2.049 2.82 27.52

J (4) 1.25 6.83 2.817 1.66 13.00

H (4) 1.65 6.11 3.526 1.04 9.19

K (4) 2.2 5.72 3.194 0.63 5.71

L (5) 3.4 5.25 2.304 0.30 3.04

${\it LW}$ 2 (6) 6.75 0.837 0.12 0.94

${\it LW}$ 10 (6) 11.5 0.517 0.16 0.60

${\it PHT}$ 03 (6) 25.0 0.089 0.08 0.10

**Table 1:** Optical and near-infrared broad-band photometric parameters of Wray 977 collected from literature; the infrared fluxes were observed with ISO. The fluxes are dereddened using the extinction law of Mathis (1990) and E(B-V)=1.9. (1) Bord et al. (1976); (2) Hammerschlag-Hensberge et al. (1976); (3) Van Dishoeck & Black (1989); (4) Coe et al. (1997); (5) Glass (1979); (6) ISO (see Sect. 2.2).
Passband	$\lambda$	Mag	$f_{\nu}$	$A_{\lambda}$ (mag)	$f_{\nu}$ (cor)
	( $\mu$ m)		(Jy)	(R_V=3.1)	(Jy)
U (1)	0.365	13.01	0.012	9.18	55.23
B (1)	0.44	12.59	0.041	7.80	53.87
V (2)	0.55	10.83	0.177	5.89	40.26
I (3)	0.90	7.6	2.049	2.82	27.52
J (4)	1.25	6.83	2.817	1.66	13.00
H (4)	1.65	6.11	3.526	1.04	9.19
K (4)	2.2	5.72	3.194	0.63	5.71
L (5)	3.4	5.25	2.304	0.30	3.04
${\it LW}$ 2 (6)	6.75		0.837	0.12	0.94
${\it LW}$ 10 (6)	11.5		0.517	0.16	0.60
${\it PHT}$ 03 (6)	25.0		0.089	0.08	0.10

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