最小質量恆星列表
這是一份有關最小質量恆星的列表,依木星質量與太陽質量的多寡來依序排列。
恆星質量是恆星最重要的一個要素。質量加上化學成分能確定一顆恆星的光度、實際上的大小和最後的命運。列在表上的恆星質量都小於1倍太陽質量,包括棕矮星與紅矮星。研究顯示大於13倍木星質量的天體會發生氘核聚變,而大於65倍木星質量的天體會產生鋰聚變,因此恆星的質量不會低於13倍木星質量[1]。棕矮星是類恆星天體的一種,它們是所謂「失敗的恆星」(Failed Star),由於質量不足,不能像正常恆星那樣通過氫核聚變維持光度,無法成為主序星。但它們的內部及表面均呈對流狀態,不同的化學物質並不會在內部分層存在。研究表明褐矮星為處於13倍木星質量與75-80倍木星質量之間的天體。[2]
小質量恆星的種類
[編輯]黑矮星
[編輯]黑矮星(Black dwarf)是一顆白矮星在溫度低到不再能發出可以被偵測到的光或熱時的狀態。因為目前宇宙還沒有觀測到黑矮星存在,因此其質量不明。[3]
棕矮星
[編輯]棕矮星(Brown dwarf)是一種小質量恆星。它們就是「失敗的恆星」。由於質量不足,不能像其他恆星通過氫核聚變維持光度,因此無法成為主序星,並導致其質量較低。棕矮星的質量為13倍至80倍木星質量,即太陽質量的0.01至0.08倍。[2]
紅矮星
[編輯]紅矮星(Red dwarf)是一種質量較小、溫度較低的恆星[1],其質量是太陽質量的0.075至0.5倍。[4]
橙矮星
[編輯]橙矮星(Orange dwarf),是較為接近太陽質量的恆星種類,其質量是太陽質量的0.5至0.8倍。[5]
黃矮星
[編輯]黃矮星(Yellow dwarf),是最接近太陽質量的恆星種類。這些恆星的質量大約在0.8至1.0太陽質量[5]。太陽也是一個黃矮星。[6]
白矮星
[編輯]白矮星(White dwarf),是低質量恆星演化階段的最終產物。這些恆星的質量大於1太陽質量。[7]
列表
[編輯]恆星名稱 | 太陽質量 | 木星質量 | 光譜類型 | 參考文獻 |
---|---|---|---|---|
木星(非恆星,參照物) | 0.00096 | 1 | 行星 | [8] |
蝘蜓座110913-773444 | 0.009 | 8 | T | [9] |
OTS 44 | 0.013 | 15 | T | [10] |
蛇夫座1622 A | 0.014 | 15.5 | T | [11] |
蛇夫座1622 B | 0.016 | 17.5 | T | [11] |
格利澤229 | 0.021 | 25 | T | [12] |
2M1207 | 0.021 | 25 | T | [13] |
印第安座εB | 0.024 | 28 | T | [14] |
HD 98230B | 0.037 | 39 | L | [15] |
Teide 1 | 0.041 | 43 | L | [16] |
印第安座εA | 0.045 | 47 | L | [14] |
沃夫424B | 0.050 | 52 | L | [14] |
葛利斯570D | 0.050 | 52 | L | [14] |
LP 944-020 | 0.056 | 58 | L | [17] |
2MASS 0415-0935 | 0.060 | 63 | L | [18] |
Wolf 424A | 0.060 | 63 | L | [19] |
DENIS 1048-0039 | 0.065 | 68 | L | [20] |
2MASS 1835+3259 | 0.070 | 75 | L | [18] |
DENIS 0255-4700 | 0.070 | 75 | L | [20] |
格利澤1245C | 0.074 | 79 | L | [21] |
2MASS 0532+8246 | 0.077 | 81 | M9.5 | [18] |
LHS 3003(GJ 3877) | 0.077 | 81 | M9.5 | [22] |
格利澤165B | 0.080 | 84 | M9 | [23] |
格利澤623B | 0.080 | 84 | M9 | [23] |
LHS 1070B | 0.080 | 84 | M9 | [24] |
LHS 1070C | 0.080 | 84 | M9 | [24] |
羅斯614B | 0.080 | 84 | M9 | [17] |
蒂加登星 | 0.080 | 84 | M9 | [17] |
VB 10 | 0.080 | 84 | M9 | [25] |
Gl 105C | 0.082 | 86 | M9 | [26] |
LHS 292 | 0.083 | 87 | M8 | [17] |
LP 731-058 | 0.083 | 87 | M8 | [17] |
巨蟹座DX | 0.087 | 91 | M7 | [17] |
VB 8 | 0.088 | 92 | M7 | [27] |
劍魚座ABC | 0.089 | 93 | M7 | [28] |
OGLE-TR-122b | 0.091 | 96 | M6.5 | [29] |
沃夫 359 | 0.1 | 105 | M4 | [17] |
太陽 | 1.0 | 1042 | G2 | [30] |
天狼星 | 2.32 | 2436 | A2 | [31] |
參宿七 | 17 | ------ | B8 | [32] |
參宿一 | 28 | ------ | 09.5 | [33] |
R136a1 | 300 | ------ | O6-Ia0 | [34] |
堰蜓座110913-773444
[編輯]蝘蜓座110913-773444比之前所知最小的棕矮星OTS 44還要小,質量只有8倍木星質量,甚至比一些太陽系外行星還小。科學家對這個天體的分類還沒有取得共識,所以堰蜓座110913-773444可能是一顆次棕矮星或是一顆流浪行星。[9]
參見
[編輯]參考
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