金牛座：有行星的恒星
(原标题: Epsilon Tauri: Star with Planet)
2024-01-26
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金牛座银座距我们146光年远。它是一颗k型红巨星，温度比太阳低，但它的半径是太阳的13倍，亮度是太阳的近100倍。作为毕宿星团的一员，这颗巨星被称为Ain，它和更明亮的大恒星毕宿五一起构成了金牛座的眼睛。在金牛座被布满灰尘的黑云包围着，我们也知道它有一颗行星。2006年通过径向速度测量发现，金牛座b是一颗比木星大的气态巨行星，公转周期为1.6年。虽然我们无法直接看到这颗系外行星，但在漆黑的夜晚，我们很容易用肉眼看到它的母星金牛座。
查看原文解释
silon Tauri lies 146 light-years away. A K-type red giant star, epsilon Tau is cooler than the Sun, but with about 13 times the solar radius it shines with nearly 100 times the solar luminosity. A member of the Hyades open star cluster the giant star is known by the proper name Ain, and along with brighter giant star Aldebaran, forms the eyes of Taurus the Bull. Surrounded by dusty, dark clouds in Taurus, epsilon Tau is also known to have a planet. Discovered by radial velocity measurements in 2006, epsilon Tauri b is a gas giant planet larger than Jupiter with an orbital period of 1.6 years. And though the exoplanet can't be seen directly, on a dark night its parent star epsilon Tauri is easily visible to the unaided eye.
© Reg Pratt