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VX Sagittarii
VX Sagittarii is a late-type red supergiant or hypergiant pulsating variable star located more than 1.5 kiloparsec away from the Sun in the constellation of Sagittarius. It is one of the largest stars discovered so far, although the radius is poorly known.
==Stellar characteristics==
The star is classed as a cool semiregular variable with a pulsational period of 732 days, although the variations have an amplitude comparable to a long period variable, a spectral type varying between M4e (close to visual maximum) and M10e (at minimum light), and a luminosity class of Ia (bright supergiant). The effective temperature is also highly variable from around 2,500K at minimum to around 3,500K near maximum, and with an average temperature given as 2,900 K.
Stellar behaviour at times resembles that of Mira-type pulsating giants and shows hints of molecular water layers and SiO masers in the atmosphere, but at other times the pulsations are smaller and irregular. VX Sgr is far more luminous than any true long period variable. Although the visual brightness variation is dramatic, the bolometric luminosity is dominated by infrared output and the variation in the infrared is small, so variation in luminosity is modest. Data in the starbox is generally given for peak luminosity and peak temperature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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