Click on the image for a full resolution version   R Aquarii (R Aqr) is a double star. The primary, a Mira variable star, with a mass around 1 to 1.5 solar masses. The secondary is a white dwarf with a mass between 0.6 and 1.0 solar masses. The dynamics of this binary system is … Continue reading R Aquarii. Cederblad 211