V694 Mon
Type: Z And
AAVSO lightcurve (2020 )
AAVSO lightcurve (index)
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.