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Glossary term: 恆星

Description: 恆星是由等離子體——與電子分離的原子核——構成的球體。恆星自身的引力將內部的等離子體束縛在一起,而恆星核心區域的核聚變過程產生的內壓阻止了其自身的塌縮。天文學家對物理學術語的使用不太嚴格,通常將“氣體”和“等離子體”互換使用,因此也將恆星稱為氣體球。在恆星的大氣層中,等離子體可能只是部分電離的,甚至包含一些未電離的原子,這取決於恆星的溫度。

離地球最近的恆星是太陽。

在更廣泛的意義上,“恆星”一詞包括核聚變尚未開始的原恆星,以及中子星或白矮星等恆星遺跡。這些恆星遺跡並不是簡單的等離子體球——白矮星在冷卻數十億年後會結晶成一種不同尋常的固體,而中子星則與巨大的原子核非常相似。

無論是用肉眼還是通過光學望遠鏡觀察,恆星都是夜空中最明顯的天體。在宇宙中,恆星通常存在於星系中,每顆恆星一般都伴隨著一顆或多顆行星。研究恆星如何形成和演化是天體物理學的一個重要分支領域。

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

This is an automated transliteration of the simplified Chinese translation of this term

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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在星系團的外圍有一道光弧。在這條弧線上有一個點,它是最早一批形成恆星中的一顆。

引力透鏡放大了一顆早期恆星

Caption: 這幅圖像放大了一顆在宇宙誕生後最初十億年內形成的恆星(紅移為 6.2)。哈勃太空望遠鏡利用一種叫做引力透鏡的技術探測到了這道光。在觀測者和被成像的恆星之間有一個巨大的星系團,這就導致了母星系扭曲變形的圖像,並揭示了它的特徵。
Credit: NASA, ESA, B. Welch (JHU), D. Coe (STScI), A. Pagan (STScI) credit link

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


在一片水域中,獵戶座的形狀就像一個轉了 45 度的領結。明亮的天狼星位於圖像的左半部分

星空下的瞭望塔和稻田

Caption: 2022 年國際天文學聯合會 OAE 天體攝影比賽靜態天體圖案類獲獎作品。 這張照片拍攝於 2022 年 4 月,展示的是中國廣東省一個村莊中,百年瞭望塔周圍種植園上空的天空。自古以來,天空一直被用作導航工具和曆法。通過觀察恆星的明顯運動,可以追尋時間的流逝,從而了解季節的變化,進而幫助規劃農活的最佳時間。 這幅圖中最明顯的星座是獵戶座和大犬座。獵戶座通常與希臘神話中的巨型獵人聯繫在一起,獵戶座的後面是他的獵犬,形狀就如大犬座。 在中國,獵戶座的七顆亮星被看似矛盾地稱為三星(參),是二十八宿之一。巴比倫的前黃道體系,即所謂的 "月亮之路",包含 17 個星座,其中包括獵戶座(被命名為 "天國的真正牧人")。這其實並不奇怪,因為即使在 88 個現代星座系統中,月亮有時也會位於獵戶座中。現代星座的邊界是在 20 世紀 20 年代確定的,獵戶座的區域在黃道以南半度處結束,以避免太陽進入獵戶座。不過,月亮和行星偶爾也會進入。因此,獵戶座是黃道十二宮(黃道周圍 5 到 10 度的條紋)的一部分,也是月亮運行軌跡的一部分,當然也被世界各地許多文化的歷法所使用。 照片左半部分的亮星是天狼星(Sirius),它是夜空中最亮的星星,許多原住民文化都用它來確定曆法;埃及人根據天狼星的偕日昇(heliacal rise)等待尼羅河洪水的到來,而羅馬人則把它在白天隱身後的再次出現與最炎熱的夏季聯繫在一起。在古代中國,天狼星被認為是一顆單星星宿,稱為 "天狼"。相鄰的區域被稱為 "兵市",而大犬座南部的區域則被想象為 "箭弓"。 右上角的紅色亮星是參宿四,它是一顆紅色超巨星,也是肉眼能看到的最大的恆星之一。值得一提的是獵戶座腰帶下方的獵戶座大星雲,這張照片中還清晰地顯示了一個更暗的巨大紅色弧線,被稱為巴納德環。這個銀河星雲和獵戶座並不明亮的頭部周圍的圓形紅色星雲都是恆星形成區的一部分,而獵戶座左上方的紅色星雲則位於難以辨認的麒麟座中的玫瑰星雲。
Credit: Likai Lin/IAU OAU

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons

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