Variable Stars - V694 Mon
Type Z And Click for lightcurve Symbiotic variables of the Z Andromedae type are close binaries consisting of a hot star, a star of late type, and an extended envelope excited by the hot star's radiation. The combined brightness displays irregular variations with amplitudes up to 4 mag. in V. A very inhomogeneous group of objects. AAVSO Alert #678: 11 September 2019 Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) is requesting BVRI photometry, visual observations, and spectroscopy of the symbiotic variable V694 Mon (MWC 560). Dr. Karovska writes: "MWC 560 is a symbiotic system showing jet/outflow activity. The system has undergone several outbursts since 1990, including a recent one that started in late 2018." An observation of V694 Mon in the AAVSO International Database (the first since May 2019, when it was visual magnitude 9.1 (C. Adib, Porto Alegre, Brazil)) shows the system at 8.795 V +- 0.008 on 2019 Sep. 09.43423 UT (S. Dvorak, Clermont, FL). Its range is 8.88-12.2 V. Bi-weekly photometry will be very much appreciated. UBV (and RI if possible) coverage is needed. Visual observations are also encouraged.
Hills Observatory: 1 January 2013 to 28 December 2020