IRAS 16552

Caution!! Although I am happy to share my research notes below with all visitors to my webpages, these pages are mainly designed for my own use and subject to change without warning. I do not guarantee the correctness of all contents as well.

IRAS 16552-3050 (PN PM 1-120) -- a possible water fountain star.

A 22GHz H2O maser survey of post-AGB and PNe candidates detected 5 sources among which 4 are new: two in PNe (IRAS 17443-2949 and IRAS 18061-2505), a “water fountain” in a post-AGB star (IRAS 16552-3050), and one in a source previously catalogued as a PN, but whose classification is uncertain (IRAS 17580-3111). Up to now, four PNe are known to have H2O masers. They concluded that the presence of H2O maser in PNe indicates massive, rapidly evolving PNe. (from Suarez et al., 2007A&A...467.1085S)
(figure: H2O maser spectra observed at 3 epoches.)

VLA mapping of the H2O masers in IRAS 16552-3050 revealed bipolar distribution with ~170 km/s velocity separation and 0.08" spatial separation. This source has no optical counterpart or 2MASS counterpart. They mentioned that about half of the 11 known water fountain stars do not have IR counterpart in 2MASS catalog. (from Suarez et al., 2008ApJ...689..430S)
(Fig. left -- H2O maser spectrum and map obtained in March 2007; right -- the same data obtained in Dec. 2008.)

[ previous ] [ upper ] [ next ] Welcome comments to me: jinhuahe

ynao.ac.cn [back to my Home]