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Evolution of the H2O Maser Emission in the Star-Forming Region S252A |
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| Authors: | Ashimbaeva N. T. Colom P. Lekht E. E. Pashchenko M. I. Rudnitskii G. M. Tolmachev A. M. |
| Affiliation: | 1.Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, 119234, Russia ;2.LESIA, Observatoire de Paris-Meudon, CNRS, UPMC, Université Paris-Diderot, 92195, Meudon Cedex, France ;3.Russian Academy of Sciences, Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Pushchino, Moscow oblast, 142290, Russia ; |
| Abstract: | 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. |
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