VY CMa

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VY CMa -- a RSG (see Simbad entry)

VERA VLBI measurement of VY CMa distance gave parallax of 0.88+-0.08 mas, which is corresponding to a distance of 1.14 (+0.11,-0.09) kpc to the sun. This new distance modifies the luminosity of this RSG to be 3(+-0.5)x10^5 Lsun. (from Choi et al., 2008arXiv0808.0641C)

They present 4.6um CO spectra of the CSE around two RSGs (potential SN progenitors): Betelgeuse and VY CMA. In Betelgeuse, the spatial distribution of CO emission is different from that of K I emission, indicating that the K I emission is governed by ionization effect. In VY CMa, the CO clumps are coincident with K I clumps, indicating that K I is reflected stellar light from the inner edges of CO clumps. VY CMa is very likely a pre-SN IIn. (from Smith et al., arXiv:0811.3037)

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