Evolution of the H2O Maser Emission in the Star-Forming Region S252A
- Авторы: Ashimbaeva N.T.1, Colom P.2, Lekht E.E.1, Pashchenko M.I.1, Rudnitskii G.M.1, Tolmachev A.M.3
-
Учреждения:
- Sternberg Astronomical Institute
- LESIA, Observatoire de Paris-Meudon, CNRS, UPMC
- Russian Academy of Sciences
- Выпуск: Том 63, № 12 (2019)
- Страницы: 1022-1034
- Раздел: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/193298
- DOI: https://doi.org/10.1134/S1063772919120011
- ID: 193298
Цитировать
Аннотация
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.
Об авторах
N. Ashimbaeva
Sternberg Astronomical Institute
Email: lekht@sai.msu.ru
Россия, Moscow, 119234
P. Colom
LESIA, Observatoire de Paris-Meudon, CNRS, UPMC
Email: lekht@sai.msu.ru
Франция, Meudon Cedex, 92195
E. Lekht
Sternberg Astronomical Institute
Автор, ответственный за переписку.
Email: lekht@sai.msu.ru
Россия, Moscow, 119234
M. Pashchenko
Sternberg Astronomical Institute
Email: lekht@sai.msu.ru
Россия, Moscow, 119234
G. Rudnitskii
Sternberg Astronomical Institute
Email: lekht@sai.msu.ru
Россия, Moscow, 119234
A. Tolmachev
Russian Academy of Sciences
Email: lekht@sai.msu.ru
Россия, Pushchino, Moscow oblast, 142290
Дополнительные файлы
