Pilot VLBI Survey of SiO ν = 3 J = 1→0 Maser Emission around Evolved Stars

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In this letter, we report on detections of SiO ν =3 J =1→0 maser emission in very long-baseline interferometric (VLBI) observations towards 4 out of 12 long-period variable stars: WX Psc, R Leo, W Hya, and T Cep. The detections towards WX Psc and T Cep are new ones. We also present successful astrometric observations of SiO ν = 2 and ν = 3 J = 1→0 maser emissions associated with two stars: WX Psc and W Hya and their position-reference continuum sources: J010746.0+131205 and J135146.8-291218 with the VLBI Exploration of Radio Astrometry (VERA). The relative coordinates of the position-reference continuum source and SiO ν = 3 maser spots were measured with respect to those of an SiO ν = 2 maser spot adopted as a fringe-phase reference. Thus, the faint continuum sources were inversely phase-referenced to the bright maser sources. This implies possible registration　of multiple SiO maser line maps onto a common coordinate system with 10 microarcsecond-level accuracy.

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