Abstract
Abstract We present distance measurements of the semiregular variable RX Bootis (RX Boo) with its annual parallax. Using the unique dual-beam system of the VLBI Exploration of Radio Astrometry (VERA) telescope, we conducted astrometric observations of a water maser spot accompanying RX Boo, referred to the quasar J1419$+$2706 separated by 1$^\circ\!\!\!.$69 from RX Boo. We measured the annual parallax of RX Boo to be 7.31$\ \pm\ $0.50 mas, corresponding to a distance of 136$^{+10}_{-9}\ $pc, from one-year monitoring observation data of one maser spot at $V_{{\rm LSR}}$$=$ 3.2 km s$^{-1}$. The distance, itself, is consistent with that obtained with Hipparcos. The distance uncertainty was reduced by a factor of two, allowing us to determine the stellar properties more accurately. Using our distance, we discuss the location of RX Boo in various sequences of Period–Luminosity (PL) relation. We found that RX Boo is located in the Mira sequence of the PL relation. In addition, we calculated the radius of the photosphere and the mass limitation of RX Boo, and evaluated its evolutionary status.
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