Evolution of the H2O Maser Emission in the Star-Forming Region S252A


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Resumo

Results of observations of the star-forming region S252A in the 1.35-cm H2O and 18-cm OH lines obtained using the 22-m Pushchino (Russia) and Nancay (France) radio telescopes are presented. A catalog of H2O maser spectra for 1995-2019 is presented. The variability of the integrated flux has two components: a cyclic component with a time interval between cycles ~30-35 yrs and a short-period component with a mean period of about 2.6 yrs. This may reflect non-stationary formation of a protostar. It is shown that the medium where the H2O maser emission and thermal OH emission are generated is strongly fragmented, and contains small-scale turbulent motions comparable to the thermal motions of the matter. The observed drift and jumps in the radial velocity of the H2O emission features could be a consequence of complex, non-uniform structure of the maser condensations.

Sobre autores

N. Ashimbaeva

Sternberg Astronomical Institute

Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

P. Colom

LESIA, Observatoire de Paris-Meudon, CNRS, UPMC

Email: lekht@sai.msu.ru
França, Meudon Cedex, 92195

E. Lekht

Sternberg Astronomical Institute

Autor responsável pela correspondência
Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

M. Pashchenko

Sternberg Astronomical Institute

Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

G. Rudnitskii

Sternberg Astronomical Institute

Email: lekht@sai.msu.ru
Rússia, Moscow, 119234

A. Tolmachev

Russian Academy of Sciences

Email: lekht@sai.msu.ru
Rússia, Pushchino, Moscow oblast, 142290

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