疏散星團 M 35 和 NGC 2158
Open Star Clusters M35 and NGC 2158
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來源:Evan Tsai|發表日期:2025-02-27
在這個單一的星空望遠鏡視場中,有兩個開放星團--M 35 和 NGC 2158 。這兩個星團位於雙子座的邊界內,看起來就像並排在一起。它們的恆星都集中在右上方,不過 M 35 相對較近。M 35 (也被編入 NGC 2168 )的距離只有 2800 光年, 400 多顆恆星分佈在大約 30 光年寬的範圍內。明亮的藍色恆星經常能區分出像 M 35 這樣較年輕的疏散星團,據估計,M 35 的年齡為 1 . 5 億年。左下方的 NGC 2158 比 M 35 的距離遠四倍,結構也更加緊湊,閃爍著淡黃色的光芒,其恆星群的年齡比 M 35 大 10 多倍。一般來說,開闊星團是沿著銀河系的平面分佈的。它們的成員恆星在鬆散的引力作用下,隨著疏散星團繞銀河系中心執行,往往會在數十億年後分散開來。
原文:Framed in this single, starry, telescopic field of view are two open star clusters, M35 and NGC 2158. Located within the boundaries of the constellation Gemini, they do appear to be side by side. Its stars concentrated toward the upper right, M35 is relatively nearby, though. M35 (also cataloged as NGC 2168) is a mere 2800 light-years distant, with 400 or so stars spread out over a volume about 30 light-years across. Bright blue stars frequently distinguish younger open clusters like M35, whose age is estimated at 150 million years. At lower left, NGC 2158 is about four times more distant than M35 and much more compact, shining with the more yellowish light of a population of stars over 10 times older. In general, open star clusters are found along the plane of our Milky Way Galaxy. Loosely gravitationally bound, their member stars tend to be dispersed over billions of years as the open star clusters orbit the galactic center.
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