# Long-term photometric behavior of the eclipsing cataclysmic variable V729 Sgr

## TL;DR

This study analyzes the long-term photometric behavior of the eclipsing cataclysmic variable V729 Sgr, revealing outburst characteristics, oscillations, and its intermediate nature between dwarf novae and nova-like systems.

## Contribution

It provides the first detailed analysis of rapid oscillations in V729 Sgr and constrains its mass transfer rate, offering new insights into its classification and behavior.

## Key findings

- Outburst amplitude and recurrence time relationship established
- Detected and analyzed for the first time the rapid oscillations, including DNOs and lpDNOs
- V729 Sgr is an intermediate between dwarf nova and nova-like CVs

## Abstract

We present the analysis results of an eclipsing cataclysmic variable (CV) V729 Sgr, based on our observations and AAVSO data. Some outburst parameters were determined such as outburst amplitude ($A_{n}$) and recurrence time ($T_{n}$), and then the relationship between $A_{n}$ and $T_{n}$ is discussed. A cursory examination for the long-term light curves reveals that there are small-amplitude outbursts and dips present, which is similar to the behaviors seen in some nova-like CVs (NLs). More detailed inspection suggests that the outbursts in V729 Sgr may be Type A (outside-in) with a rise time $\sim1.76$ d. Further analysis also shows that V729 Sgr is an intermediate between dwarf nova and NLs, and we constrain its mass transfer rate to $1.59\times10^{-9} < \dot{M}_{2} < 5.8\times10^{-9}M_{\odot}yr^{-1}$ by combining the theory for Z Cam type stars with observations. Moreover, the rapid oscillations in V729 Sgr were detected and analyzed for the first time. Our results indicate that the oscillation at $\sim 25.5$ s is a true DNO, being associated with the accretion events. The classification of the oscillations at $\sim 136$ and $154$ s as lpDNOs is based on the relation between $P_{lpDNOs}$ and $P_{DNOs}$. Meanwhile, the QPOs at the period of hundreds of seconds are also detected.