Other
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..235y&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Other
3
Scientific paper
We present simultaneous observations of 1 and 2 J SiO masers at 43 GHz in TX Cam using the VLBA, over three different stellar phases. The spatial distribution of the two maser line emissions is considered to be a strong constraint on the modeling of circumstellar SiO maser.
We find that the separation of the masing components in the 1 and 2 J changes over different stellar phases. We argue that a conclusion in favor of one maser pumping scheme based on a single epoch observation could be misleading. We also show some other evidence of stellar phase dependent properties. The disruption of a ring shape of maser distribution centered on the star is observed when the maser flux become weaken. The ring radii and the number of masing components vary depending on the stellar phase.
Our multi-epoch simultaneous observations of 1 and 2 J SiO masers prove that modelings of a SiO maser pumping mechanism can be greatly benefited by this kind of work. Observations of the phase dependence properties of the SiO masers in Mira variable show clearly the need of many new high resolution experiments toward other types of evolved stars.
Booth Roy S.
Conway John E.
Yi Jiyune
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