Observations of SiO J = 3-2 and J = 2-1 Emission in Late-Type Stars. II.

Details Observations of SiO J = 3-2 and J = 2-1 Emission in Late-Type Stars. II. Observations of SiO J = 3-2 and J = 2-1 Emission in Late-Type Stars. II.

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apjs..181..421c&link_type=abstract

The Astrophysical Journal Supplement, Volume 181, Issue 2, pp. 421-432 (2009).

Astronomy and Astrophysics

Astronomy

2

Circumstellar Matter, Masers, Stars: Late-Type

Scientific paper

Second observations of SiO v = 1, 2, J = 3-2 transitions, together with SiO v = 1, J = 2-1 transitions, have been performed toward 42 program late-type stars, using the 14 m radio telescope at Taeduk Radio Astronomy Observatory, from 1997 February to 1998 March. The v = 1, J = 3-2 maser was detected from 24 stars giving a detection rate of 57%, which is slightly higher than that of the first observations of 1995-1996. Four of these are new detections. For the v = 2, J = 3-2 maser, the line was detected from six stars including two new detections. The peak velocities and the velocity patterns of the v = 1, J = 3-2 masers are different from those of the v = 1, J = 2-1 indicating a difference in the traced regions. The average total photon flux of the v = 1, J = 3-2 maser is estimated to be 1042.7, that of the v = 2, J = 3-2 maser 1042.2, and that of the v = 1, J = 2-1 maser 1043.2 photons s-1. In addition, we confirm that the v = 2, J = 4-3 maser is stronger than the v = 1, J = 4-3.

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