Detections of SiO and H2O Masers in the Bipolar Nebula IRAS 19312+1950

We report on the detection of SiO and H2O masers toward a newly found bipolar nebula, IRAS 19312+1950. This object exhibits extreme red IRAS color [log (F25/F12) = 0.5 and log (F60/F25) = 0.7] and a nebulosity having a size of about 30″ extended to the south-west in the 2MASS near-infrared image. Toward this object, we have detected emission from the H2O 6(1,6)–5(2,3) transition, the SiO J = 1–0, v = 1 and 2, and J = 2–1, v = 1 transitions, and the SO 2(2)–1(1) and H13CN J = 1–0 transitions. The thermal lines of SO and H13CN are shifted by about 12 km s−1 in radial velocity with respect to the maser lines, indicating that thermal emission comes from the background molecular cloud. However, the SiO J = 2−1, v = 2 spectrum shows another component of SiO emission separated by 26 km s−1 from the main component, that might be formed in a rotating or expanding shell.