# On The Period and Light Curve of the A-Type W UMa Binary GSC 3208 1986

## TL;DR

This study provides a new analysis of the period and light curve of the A-Type W UMa binary GSC 3208 1986, revealing a moderate period increase and long-term light curve variability due to Roche lobe overfilling changes.

## Contribution

It offers updated period measurements and light-curve solutions, correcting previous claims of period decrease and explaining variability mechanisms.

## Key findings

- The system's period is increasing over two million years.
- The light curve varies over years due to Roche lobe overfilling changes.
- Contradicts earlier reports of rapid period decrease.

## Abstract

We present a new period study and light-curve solutions for the A-Type W UMa binary GSC 3208 1986. Contrary to a previous claim by R.G. Samec et al. of a rapidly decreasing period, the system's period is increasing moderately on a timescale of two million years. The light curve is variable on the time scale of years, which can be understood by changes in how much it overfills its Roche lobe.