Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.2495c&link_type=abstract
The Astronomical Journal, Volume 116, Issue 5, pp. 2495-2500.
Astronomy and Astrophysics
Astronomy
5
Stars: Circumstellar Matter, Ism: Masers, Stars: Late-Type
Scientific paper
We present the first detection of ^30SiO v = 1, J = 1-0 maser emission toward the Mira variable TX Cam among 18 surveyed evolved stars. The line width of this maser is much narrower than that of ^30SiO v = 0, J = 1-0 masers and the intensity is also weaker, indicating that it is unsaturated. The detection of the ^30SiO maser emission in the lowest rotational transition of the first vibrationally excited state, together with nearly simultaneous observations of the large number of ^29SiO and ^28SiO masers, provides good constraints for establishing the SiO maser pumping model of TX Cam. The global features of ^30SiO and ^29SiO v = 1, J = 1-0 lines are similar, but detailed characteristics, such as their half-widths, their peak intensity ratios of the v = 1, J = 1-0 line to the v = 0, J = 1-0 line, and their intensity variation with time, are different. New detection of the ^30SiO v = 0, J = 1-0 and J = 2-1 lines is also reported in six evolved stars: TX Cam, R Cas, chi Cyg, W Hya, U Lyn, and WX Psc. They show a different masing characteristics of the ^30SiO that depends on both sources and transitions. This is probably related to a critical condition for masing.
Cho Se-Hyung
Ukita Nobuharu
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