A preview look at the maser cloudlet evolution in the HMSFR IRAS 20126+4104

Aberfelds, Artis; Šteinbergs, Jānis; Shmeld, I.; Bartkiewicz, A.

doi:10.17184/eac.5655

Cited by 3 publications

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“…The size of the maser cloud(let)s has been measured to be ∼10 AU and they occur within 1000 AU of the HMYSOs. The EVN has been critical to their study e.g., [18][19][20][21][22][23] (Figure 1). 6.7 GHz methanol masers occur in a range of morphologies, but an interesting morphological sub-set is the ring-type targets.…”

Section: 7 Ghz Methanol Masersmentioning

confidence: 99%

Stellar Evolution Studies Using Masers

Humphreys¹

2023

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022)

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Masers probe a number of stages of stellar evolution including star-formation, asymptotic giant branch stars, pre-planetary nebulae, red supergiants and supernova remnants. High-angular resolution studies using VLBI are revealing information on the accretion process in high-mass stars, the mass-loss process of AGB stars and on the role of magnetic fields. In addition, large projects observing masers associated with star-formation and evolved stars are mapping out galactic structure and probing galactic dynamics. Here, I outline recent results for masers in the area of stellar evolution highlighting the contributions of VLBI and EVN observations, and the synergies of these with data from other telescopes such as ALMA.

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Section: 7 Ghz Methanol Masersmentioning

confidence: 99%

Stellar Evolution Studies Using Masers

Humphreys¹

2023

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022)

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Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars

Aberfelds

Bartkiewicz

Szymczak

et al. 2023

Monthly Notices of the Royal Astronomical Society

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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 single-dish monitoring using the Irbene telescopes, we selected three sources with close sky positions.We imaged them using the European Very Long Baseline Interferometer Network and searched available data on VLBI archives to follow detailed changes in their structures and single maser spot variability. All three targets show a few groups of maser cloudlets of a typical size of 3.5 mas and the majority of them show linear or arched structures with velocity gradients of order 0.22 km s−1 mas−1. The cloudlets and overall source morphologies are remarkably stable on time scales of 7-15 yr supporting a scenario of variability due to changes in the maser pumping rate.

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Five years of 6.7-GHz methanol maser monitoring with Irbene radio telescopes

Aberfelds,

Šteinbergs,

Shmeld

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We present the results of a 5-year monitoring program of 42 sources targeted at 6.7 GHz methanol masers, conducted from March 2017 to October 2022 using the Irbene 32 and 16 meter radio telescopes. Sources were observed with irregular intervals where time between two consecutive observation ranged from twenty four hours to thirty five days. We found that more than 55 per cent of the sources showed significant variability, but often only one or a few spectral features were varying significantly. Numerous type of variability were found in our sample: low-variable, periodic, irregular, synchronised and anti-correlated between features and steadily raising or falling flux. Our analysis techniques also uncover new variability trends for several sources. The maser monitoring program is one of the first single-dish science initiatives at the Irbene radio telescope complex, initiated shortly after the instrument’s reconstruction and upgrades. Our findings unequivocally demonstrate its suitability for maser research purposes.

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A preview look at the maser cloudlet evolution in the HMSFR IRAS 20126+4104

Cited by 3 publications

References 0 publications

Stellar Evolution Studies Using Masers

Stellar Evolution Studies Using Masers

Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars

Five years of 6.7-GHz methanol maser monitoring with Irbene radio telescopes

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