Flare activity of the long-period variable star R Leonis

Details Flare activity of the long-period variable star R Leonis Flare activity of the long-period variable star R Leonis

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..672e&link_type=abstract

Astronomy Letters, Volume 25, Issue 10, October 1999, pp.672-677

Astronomy and Astrophysics

Astronomy

6

Scientific paper

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 H_alpha 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 about 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.

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