ARAS eruptive stars monitoring

The ARAS eruptive stars group monitors novae, symbiotic stars, and eventually dwarf novae ... with small telescopes (typically 20-60 cm) equipped with slit (R=600 to 15000) and echelle (R=10000) spectrographs. 4175 spectra of 65 novae and 8379 spectra of 104 symbiotics secured since 2013 are accessible for free access from the ASDB spectral database. We present four examples to demonstrate the long-term monitoring, high cadence program, and the reactivity of the members to special events such as outbursts or eclipses. 1. The 2021 outburst of the recurrent nova RS Oph was carefully studied with daily echelle spectra and flux-calibrated low-resolution spectra for a period of one month. This monitoring allowed the construction of the evolution of the ionization state of the system during the outburst. 2. One of the main tasks of our program is the long-term monitoring of classical symbiotic stars over several orbital cycles following the suggestion of S. J. Kenyon (1986) and J. Mikolajewska. The complex behavior of the eclipsing system AX Persei is briefly summarized to illustrate our purpose. 3. An example of monitoring an eclipse in an accretion-powered symbiotic star BX Mon in April 2023. 4. The behavior of the recurrent symbiotic nova T CrB (1866, 1946) before its next nova event which is expected in the very next months or years. The cadency of the observations has enabled us to time precisely the end of the long high state detected in 2015.