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U Equulei
U Equulei (U Equ / IRAS 20547 +0247) is a variable star in the constellation of Equuleus of an apparent magnitude of +14.50 in the B band. It lies at an estimated distance of 5,000 light-years (1,500 parsecs ) of the Solar System.
== Properties ==
U Equulei is a peculiar star whose optical spectrum is one of the strangest observed. Their spectra, obtained in 1994, are dominated by strong absorption units metallic oxides〔 somewhat similar to red giant of spectral type M. The bands due to TiO, AlO, and appear to have a source VO-from circumstellar material surrounding the star-and photospheric . There appears to be falling into the star material or mass ejection therefrom, it is thought that gas can be contained in a disk-shaped structure. U Equulei also shows other peculiarities. Its emissions maser of OH and H2O〔 vary in speed and intensity. Also, its high radial velocity (78 km / s) and galactic latitude (-26 °) suggest a link with the population of galactic halo.
U Equulei is ranked as an irregular variable of long period (LB) whose brightness-B-band magnitude varies between +14.5 and +15.5. Although in 1994 the visual magnitude was about +9, post - 1996, 1998 and 1999 - showed a decrease in magnitude to +13. Variations in visual magnitude and the origin of circumstellar material remain unexplained, however, the strange nature of its optical spectrum suggests that the star may have entered a stage of rapid development.
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