A highly variable methanol maser in G111.256-0.770

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Royal Astronomical Society

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 time-scale of 5-6 yr and individual features showed small amplitude short-lived (∼0.2 yr) bursts superimposed on higher amplitude slow (>5 yr) variations. The maser integrated flux density appears to be correlated with the near-infrared flux observed with the (NEO)WISE, supporting radiative pumping of the maser line.

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masers;, stars: formation;, stars: individual: G111.256-0.770;, stars: massive;, radio lines: ISM;

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Monthly Notices of the Royal Astronomical Society vol. 485, 2019, pp.777–783.

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