IRAS 15445
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IRAS 15445-5449 (OH 326.5 -0.4) -- a possible water fountain star.

The 22 GHz H2O maser is searched for 85 post-AGB candidates using the Tidbinbilla 70m radio telescope between 2003 April to 2004 April. There are 21 detections. Also present Mopra observations of 86 GHz SiO masers to a sub-sample. Five stars were found to show high velocity H2O maser lines and are water fountain star candidates, including IRAS 15445-5449 (their source name: d46). OH 1612, 1665 and 1667 MHz masers and 22 GHz H2O masers were all detected in IRAS 15445-5449. The OH profiles were very broad, covering -200~-100 km/s range, while H2O maser peaks were red-shifted by about 50 km/s (covering -145~-54 km/s). The profiles make the star like a water fountain star. Continuum was detected at 3, 6 and 13 cm to be 11, 18 and 30 mJy respectively (non-thermal, spectral index of -0.8). (from Deacon et al., 2007ApJ...658.1096D)
(figure: H2O 22 GHz maser and OH 1612, 1665, 1667 GHz maser spectra of IRAS 15445-5449.)
IRAS152.gif (21618 字节)
 

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