Table 1: Physical and atmospheric parameters for the RGB stars in NGC 2808 used for the present study. The temperatures, luminosities, and gravities listed in Cols. 3-5 are derived from the (V-K) colours (see Sect. 2). The expansion velocities and mass loss rates in Cols. 11 and 12 are discussed in Sect. 4.1.
Star ID M_V $T_{\rm eff}$ (K) $R_{\ast}$ / $R_{\odot}$ log $L_{\ast}$ / $L_{\odot}$ log $g_{\ast}$ H $\alpha$ shift B/R K₃ shift B/R $V_{\rm exp}$ $\dot{M}$

km s^-1 H $\alpha$ km s^-1 K₂ km s^-1 $M_{\odot}~ \rm yr^{-1}$

37872 -1.940 4015 67 3.028 0.71 -2.57 <1 -5.03 <1 15 $1.1 \times 10^{-9}$

47606 -2.154 3839 92 3.218 0.44 -0.31 >1 -6.25 >1: 15 $1.1 \times 10^{-10}$

48889 -2.249 3943 84 3.188 0.52 -3.48 <1 -5.19 <1 53 $3.8 \times 10^{-9}$

51454 -2.144 3893 85 3.177 0.51 -3.95 >1 -7.70 <1 10 $0.7 \times 10^{-9}$

51499 -2.155 3960 79 3.142 0.57 -4.39 <1 -6.25 <1 18 $1.2 \times 10^{-9}$

**Table 1:** Physical and atmospheric parameters for the RGB stars in NGC 2808 used for the present study. The temperatures, luminosities, and gravities listed in Cols. 3-5 are derived from the (V-K) colours (see Sect. 2). The expansion velocities and mass loss rates in Cols. 11 and 12 are discussed in Sect. 4.1.
Star ID	M_V	$T_{\rm eff}$ (K)	$R_{\ast}$ / $R_{\odot}$	log $L_{\ast}$ / $L_{\odot}$	log $g_{\ast}$	H $\alpha$ shift	B/R	K₃ shift	B/R	$V_{\rm exp}$	$\dot{M}$
						km s^-1	H $\alpha$	km s^-1	K₂	km s^-1	$M_{\odot}~ \rm yr^{-1}$
37872	-1.940	4015	67	3.028	0.71	-2.57	<1	-5.03	<1	15	$1.1 \times 10^{-9}$
47606	-2.154	3839	92	3.218	0.44	-0.31	>1	-6.25	>1:	15	$1.1 \times 10^{-10}$
48889	-2.249	3943	84	3.188	0.52	-3.48	<1	-5.19	<1	53	$3.8 \times 10^{-9}$
51454	-2.144	3893	85	3.177	0.51	-3.95	>1	-7.70	<1	10	$0.7 \times 10^{-9}$
51499	-2.155	3960	79	3.142	0.57	-4.39	<1	-6.25	<1	18	$1.2 \times 10^{-9}$

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