Time Variation of SiO Masers in VX Sagittarii over an Optically Quiescent Phase

Details Time Variation of SiO Masers in VX Sagittarii over an Optically Quiescent Phase Time Variation of SiO Masers in VX Sagittarii over an Optically Quiescent Phase

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..341k&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.57, No.2, pp. 341-345

Astronomy and Astrophysics

Astronomy

5

Masers, Stars: Agb And Post-Agb, Stars: Individual (Vx Sagittarii), Stars: Late-Type, Stars: Oscillations

Scientific paper

The time variation of SiO masers in a semi-regular variable, VX Sgr, was investigated in the period between 1994 and 2004 when the optical light curve exhibited an ˜6-yr quiescent phase intercepting a regularly pulsating era. The quiescent period occurred with a delay of several years after a decrease in the SiO maser flux. VLBA observations of SiO masers made during this period showed no drastic spatial variation except for emission features being shifted from south-west to north-east. The SiO maser flux decrease, and a succeeding optical quiescent phase, may indicate that the stellar mass-loss rate diminished over a few years around 1994. A SiO maser flare occurring in 1999 may be a reminiscence of a final gas blow, which resulted in the optically quiescent period.

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