SIMBAD references

MU Vul = CSV 8390 = GR 32 was announced by K. Haeussler in 1973 as an RR Lyrae-star with a period of about 0.5 days and 0.5 mag amplitude. Five maximum timings were published. In 1975 the star was given the designation MU Vul. Since the announcement it has not been observed and thus was put on a BAV-programme. Three observers collected numerous observations in V and R in the years 2003, 2004, and 2011. MU Vul was found to be constant at V ∼ 12.4.