Flare activity of the long-period variable star R Leonis

被引：0

作者：

Esipov, VF ^{[1
]}

Paschenko, MI ^{[1
]}

Rudnitskii, GM ^{[1
]}

Fomin, SV ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119899, Russia

来源：

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 1999年 / 25卷 / 10期

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Results of the observations of the Mira Ceti-type variable star R Leo carried out in 1994-1999 are presented. Optical spectra of the star and profiles of the 1.35-cm water-vapor maser line were obtained. The star underwent a strong flare of the Ha emission line in May-June 1996. By the end of 1997 the star flared in the H2O maser line to a flux density of about 140 Jy. In 1983-1997 the H2O emission of R Leo did not exceed the sensitivity level of < 10 Jy, and after the flare, in June 1998, it again fell below 10 Jy. Both flares (H alpha and H2O) took place when the star was near its minimum visual brightness. The sequence of the flares can be explained by the impact of a shock wave on the inner layers of the circumstellar envelope of R Leo.

引用

页码：672 / 677

页数：6

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