Context. Class II methanol masers are signposts of massive young stellar objects (MYSOs).
Recent evidence shows that flares of these masers are driven by MYSO accretion bursts …

Context. Periodicity in 6.7 GHz methanol maser sources is a rare phenomenon that was
discovered during long-term monitoring programmes. Understanding the underlying …

The variability study of 6.7 GHz methanol masers has become a useful way to improve our
understanding of the physical conditions in high-mass star-forming regions. Based on the …

We present the results of a 5-yr monitoring program of 42 sources targeted at 6.7-GHz
methanol masers, conducted from 2017 March to 2022 October using the Irbene 32-and 16 …

ABSTRACT The source G9. 62+ 0.20 E surprises again! Several of the associated 6.7-and
12.2-GHz methanol masers are experiencing contemporaneous and systematic velocity …

The first confirmed periodically varying 6.031 and 6.035 GHz hydroxyl masers are reported
here. They vary contemporaneously with the 6.7 GHz methanol masers in G323. 459–0.079 …

We use 3D computer modelling to investigate the time-scales and radiative output from
maser flares generated by the impact of shock waves on astronomical unit-scale clouds in …

We present the discovery of the simultaneous flux variation of a massive young stellar object
(MYSO) G036. 70+ 00.09 (G036. 70) both in the maser emission and mid-infrared (MIR; λ= 3 …

We report the results of ongoing monitoring of the 6.7 GHz CH3OH masers associated with
G188. 95+ 0.89. In these observations, five features are periodically varying and at least two …

The study of the periodic variability of masers has greatly increased after the discovery of
periodic class II methanol (CH3OH) masers. Currently, more than 20 masers associated with …