Variability of the OH and H2O maser emission toward AS 501


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

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

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 Pleiades Publishing, Ltd.