Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..295y&link_type=abstract
In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M
Astronomy and Astrophysics
Astrophysics
Stars: Individual: Tx Camelopadalis, Agb And Post-Agb, Circumstellar Matter, Masers, Mass-Loss, Instrumentation: High Angular Resolution
Scientific paper
We have conducted simultaneous observations of υ = 1 and υ = 2 J = 1→0 SiO masers at 43 GHz in the Mira variable 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 distribution and the separation of the masing components in the υ = 1 and υ = 2 J = 1→0 changes over different stellar phases. SiO maser rings are observed in both lines, however, the disruption of the maser ring is found when the SiO maser flux becomes weaker. The ring radii and the number of masing components also vary depending on the stellar phase. We argue that a conclusion in favor of one maser pumping scheme based on a single epoch observation could be misleading.
Booth Roy S.
Conway John E.
Yi Jiyune
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