Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2

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Table B.1.

Physical parameters of the two-component RT model. ^aAdapted from (Humphreys et al. 2020).

Parameter	Value
¹²CO abundance w.r.t. H₂	2 × 10⁻⁴
Stellar temperature, T_⋆	3800 K ^a
Stellar luminosity, L_⋆	2.4 × 10⁴ L_⊙^a
Temperature, T_kin	$T_{⋆} {(\frac{r}{R_{⋆}})}^{- α}$ $T_\star\left(\frac{r}{R_\star}\right)^{-\alpha}$

Central component
Mass-loss rate, Ṁ	3 × 10⁻⁶ M_⊙ yr⁻¹
Expansion velocity, v_sph	10 km s⁻¹

Equatorial component
Total mass, M_EDE	0.05 M_⊙
Expansion velocity, v_EDE	27 km s⁻¹
Center radius, r_EDE	23000 au
Radial width, σ_EDE	6000 au
Opening angle, θ_EDE	10°

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