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Infrared variability, maser activity, and accretion of massive young stellar objects

Published online by Cambridge University Press:  16 July 2018

Bringfried Stecklum ,
Alessio Caratti o Garatti ,
Klaus Hodapp ,
Hendrik Linz ,
Luca Moscadelli  and
Alberto Sanna
Bringfried Stecklum
Affiliation:
Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany email: stecklum@tls-tautenburg.de
Alessio Caratti o Garatti
Affiliation:
Dublin Institute for Advanced Studies, Dublin, Ireland
Klaus Hodapp
Affiliation:
Institute for Astronomy, Hilo, USA
Hendrik Linz
Affiliation:
Max-Planck Institut fr Astronomie, Heidelberg, Germany
Luca Moscadelli
Affiliation:
INAF, Firenze, Italy
Alberto Sanna
Affiliation:
Max-Planck Institut fr Radioastronomie, Bonn, Germany
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Abstract

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Methanol and water masers indicate young stellar objects. They often exhibit flares, and a fraction shows periodic activity. Several mechanisms might explain this behavior but the lack of concurrent infrared (IR) data complicates the identification of its cause. Recently, 6.7 GHz methanol maser flares were observed, triggered by accretion bursts of high-mass YSOs which confirmed the IR-pumping of these masers. This suggests that regular IR changes might lead to maser periodicity. Hence, we scrutinized space-based IR imaging of YSOs associated with periodic methanol masers. We succeeded to extract the IR light curve from NEOWISE data for the intermediate mass YSO G107.298+5.639. Thus, for the first time a relationship between the maser and IR variability could be established. While the IR light curve shows the same period of ~34.6 days as the masers, its shape is distinct from that of the maser flares. Possible reasons for the IR periodicity are discussed.

Keywords

masersISM: moleculesduststars: formationindividual ([TGJ91] S255 NIRS 3[PFG2013] I22198-MM2-S)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 37 - 40
Copyright
Copyright © International Astronomical Union 2018 

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