VLBA Observation of SiO Masers in the M Giant IRC -10414

Details VLBA Observation of SiO Masers in the M Giant IRC -10414 VLBA Observation of SiO Masers in the M Giant IRC -10414

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..587i&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.587.

Astronomy and Astrophysics

Astronomy

5

Infrared: Sources, Masers, Radio Sources: Lines, Stars: Circumstellar Shells, Stars: Individual (Irc -10414), Stars: Late-Type

Scientific paper

We have mapped an M giant star, IRC -10414, in the SiO J=1-0 v=1 line at 43.1 GHz with the VLBA with a spatial resolution of better than 0.5 mas. The maser spots spread over on a circle having a radius of about 7.1 mas. A velocity gradient in the east-west direction of ~ 0.7 km s-1 mas-1 is found. Monitoring observations with Nobeyama 45-m telescope have shown that the intensity ratio of the SiO J=1-0 v=1 to v=2 maser line was quite unusual (5-40) for the period of 1997-1999 in this object; this ratio was known to be close to unity in many late-type stellar objects, but was known to deviate strongly from unity in young stellar objects. The unusual line intensity ratio of this star may suggest a chemical or geometrical anomaly of the envelope of IRC -10414. A possible ring/disk model is discussed in order to explain the distribution of the maser spots in this object. The VLBA and the VLA are the facilities of the National Radio Astronomy Observatory operated by Associated Universities, Inc., under cooperative agreements with the National Science Foundation of the USA.

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