Outburst activity of symbiotic system AGDra

TL;DR

This paper investigates the variability and outburst activity of the symbiotic binary AG Dra, revealing two main periods related to orbital motion and red giant pulsations, and analyzing their impact on the system's activity.

Contribution

It provides detailed period analysis of AG Dra's photometry and spectroscopy, identifying multiple variability periods and their relation to outburst activity.

Findings

Two main variability periods identified: ~550 days (orbit) and ~355 days (pulsations)

Outbursts recur with periods of 359 to 375 days

Active stages show distinct changes in outburst behavior

Abstract

AG Dra is a well known bright symbiotic binary with a white dwarf and a pulsating red giant. The long-term photometry monitoring and a new behaviour of the system are presented. The detailed period analysis of photometry as well as spectroscopy was carried out. In the system of AG Dra, two periods of variability are detected. The longer one around 550 days is related to the orbital motion, and the shorter one around 355 days is interpreted as pulsations of the red giant in our older paper. In addition the active stages change distinctively, but the outbursts are repeated with the periods from 359 to 375 days.