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Parallax of a Mira variable R Ursae Majoris studied with astrometric VLBI

Kurayama, Tomoharu; Honma, Mareki; Nakagawa, Akiharu +5 more

We have measured an annual parallax of the Mira variable R Ursae Majoris (R UMa) with the VLBI Exploration for Radio Astronomy (VERA). From the monitoring VLBI observations over a span of about two years, we detected H₂O maser spots in the LSR velocity range from 37 to 42 km s^-1. We derived an annual parallax of 1.97 ± 0.05 m…