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

被引：1

作者：

Ashimbaeva, N. T. ^{[1
]}

Colom, P. ^{[2
]}

Lekht, E. E. ^{[1
]}

Pashchenko, M., I ^{[1
]}

Rudnitskii, G. M. ^{[1
]}

Tolmachev, A. M. ^{[3
]}

机构：

[1] Lomonosov Moscow State Univ, Sternberg Astron Inst, Moscow 119234, Russia

[2] Univ Paris Diderot, UPMC, CNRS, LESIA,Observ Paris Meudon, F-92195 Meudon, France

[3] Russian Acad Sci, Astro Space Ctr, Lebedev Phys Inst, Pushchino Radio Astron Observ, Pushchino 142290, Moscow Oblast, Russia

来源：

ASTRONOMY REPORTS | 2019年 / 63卷 / 12期

关键词：

CATALOG;

D O I：

10.1134/S1063772919120011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 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.

引用

页码：1022 / 1034

页数：13

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