A highly variable methanol maser in G111.256–0.770. Issue 1 (14th February 2019)

• Record Type: Journal Article
• Authors: Durjasz, M; Szymczak, M; Olech, M
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 485:Issue 1(2019)
• Page Start: 777
• Page End: 783
• Publication Date: 2019-02-14
• Subjects: masers -- stars: formation -- stars: individual: G111.256−0.770 -- stars: massive -- radio lines: ISM; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz472
• Languages: English
• ISSNs: 0035-8711

Abstract

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.