Time Variation of SiO(v = 1, J = 2-1) Masers of Long Period Variables
We have detected a SiO maser line(v = 1, J = 2-1) for 15 stars out of about 80 long period variables in the wide range of period. No new sources are detected; all detected sources are variables with period longer than 300 days; no evidence is found that the dust grains in the outer envelope have influenced on this line. The time variation of this maser line for 7 stars, T Cep, mu Cep, U Her, R Leo, R Lmi, U Ori, and R Ser is observed and compared with optical light curve at the same epoch of maser observation. No universal relation between the time variation and the optical light curve is found. It implies that the radiation from a central star does not much play an important role for the direct pumping of the SiO maser line.
Journal of Korean Astronomical Society
- Pub Date:
- October 1994
- LONG PERIOD VARIABLES;
- SIO MASER LINES;
- PUMPING MECHANISM