Variability of the OH and H2O maser emission toward AS 501
- Authors: Ashimbaeva N.T.1, Colom P.2, Krasnov V.V.3, Lekht E.E.1, Pashchenko M.I.1, Rudnitskii G.M.1, Tolmachev A.M.3
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Affiliations:
- Sternberg Astromical Institute
- LESIA, Observatoire de Paris-Meudon, CNRS, UPMC
- Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute
- Issue: Vol 61, No 1 (2017)
- Pages: 16-29
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/190245
- DOI: https://doi.org/10.1134/S1063772916120027
- ID: 190245
Cite item
Abstract
The results of observations of OH (λ = 18 cm) and H2O (λ = 1.35 cm) masers toward AS 501 obtained with the Nançay Observatory Radio Telescope (France) and the 22-m radio telescope of the Pushchino Radio Astronomy Observatory (Russia), respectively, are presented. Nine cycles of H2O maser activity ranging from 2.8 to 6.0 years were detected, identifying AS 501 as an irregular variable star. Zeeman splitting was found only in the 1612-MHz satellite line at −59.2 km/s. The splitting is 0.11 km/s, corresponding to a line-of-sight magnetic field strength of 0.48 mG. The field is directed toward the observer. The detected radial-velocity drift of the H2O emission features can be explained in a model with elongated filaments with radial-velocity gradients.
About the authors
N. T. Ashimbaeva
Sternberg Astromical Institute
Email: lekht@sai.msu.ru
Russian Federation, Universitetskii pr. 13, Moscow, 119992
P. Colom
LESIA, Observatoire de Paris-Meudon, CNRS, UPMC
Email: lekht@sai.msu.ru
France, Meudon
V. V. Krasnov
Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute
Email: lekht@sai.msu.ru
Russian Federation, Pushchino, 142290
E. E. Lekht
Sternberg Astromical Institute
Author for correspondence.
Email: lekht@sai.msu.ru
Russian Federation, Universitetskii pr. 13, Moscow, 119992
M. I. Pashchenko
Sternberg Astromical Institute
Email: lekht@sai.msu.ru
Russian Federation, Universitetskii pr. 13, Moscow, 119992
G. M. Rudnitskii
Sternberg Astromical Institute
Email: lekht@sai.msu.ru
Russian Federation, Universitetskii pr. 13, Moscow, 119992
A. M. Tolmachev
Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute
Email: lekht@sai.msu.ru
Russian Federation, Pushchino, 142290
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