# A highly variable methanol maser in G111.256-0.770

## TL;DR

This study presents a decade-long monitoring of a highly variable methanol maser in G111.256-0.770, revealing significant luminosity fluctuations and short-lived bursts, providing insights into maser variability in high-mass star-forming regions.

## Contribution

It offers the first long-term, multi-epoch observational data on the variability of methanol masers in G111.256-0.770, highlighting complex temporal behavior.

## Key findings

- Maser luminosity varied by a factor of 16 over 5-6 years.
- Features exhibited small, short-lived bursts lasting about 0.2 years.
- Long-term variations persisted over more than 5 years.

## Abstract

G111.256-0.770 is a high-mass young stellar object associated with a weak 6.7 GHz methanol maser showing strong variability. We present results of a multi-epoch monitoring program of the target, conducted with the Torun 32 m telescope for more than a decade. We found that the isotropic maser luminosity varied by a factor 16 on a timescale of 5-6 yr and individual features showed small amplitude short-lived (about 0.2 yr) bursts superimposed on higher amplitude slow (>5 yr) variations.