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Long term 6.7 GHz methanol maser monitoring program

Published online by Cambridge University Press:  16 July 2018

Artis Aberfelds ,
Ivar Shmeld  and
Karlis Berzins
Artis Aberfelds
Affiliation:
Ventspils University College, Engineering Research Institute Ventspils International Radio Astronomy Centre (VIRAC), Inzenieru 101, LV-3601, Ventspils, Latvia email: [email protected]
Ivar Shmeld
Affiliation:
Ventspils University College, Engineering Research Institute Ventspils International Radio Astronomy Centre (VIRAC), Inzenieru 101, LV-3601, Ventspils, Latvia email: [email protected]
Karlis Berzins
Affiliation:
Ventspils University College, Engineering Research Institute Ventspils International Radio Astronomy Centre (VIRAC), Inzenieru 101, LV-3601, Ventspils, Latvia email: [email protected]
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Abstract

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The first long-term maser (mainly methanol) monitoring program is under way with the radio telescopes of Ventspils International Radio Astronomy Center. The first activity of this program was to develop an observations methodology and data registration and reduction software for the Ventspils telescopes. The developed routines are to be used for maser variability monitoring, investigating short bursts of intensity and a search for new, previously unknown, maser sources. Currently the program consists of 41 methanol masers observed at 6.7 GHz, while new ones are periodically added. The maser sources are observed at 3 – 5 day intervals. It was found that most the sources display a significant level of variability with time, ranging from a few days, up to several months and, perhaps, years. In addition to non-varying masers, several types of maser variability behavior were observed, including: monotonic increases or decreases, un-periodical, quasi-periodic and periodic variations.

Keywords

masersmethanolradio astronomycircumstellar matter
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. 277 - 278
Copyright
Copyright © International Astronomical Union 2018 

References

Shmeld, I., Aberfelds, A., & Berzins, K. 2018, these proceedingsGoogle Scholar
Szymczak, M., Wolak, P., BartKiewicz, A., & BorKowski, K. 2012, Astron Nach., 333, 634–639CrossRefGoogle Scholar
Berzins, K., Aberfelds, A., & Shmeld, I., 2018, these proceedingsGoogle Scholar