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Wolf 489

Wolf 489
觀測資料
曆元 J2000[1]
星座 處女座
星官
赤經 13h 36m 31.81s[1]
赤緯 +03° 40′ 45.″[1]
視星等(V) 14.66[2]
特性
光谱分类DZ10.0[2][3]
视星等 (B)15.59[1]
视星等 (V)14.63[1]
视星等 (R)14.0[1]
视星等 (I)14.1[1]
视星等 (J)13.06[1]
视星等 (H)12.82[1]
视星等 (K)12.69[1]
天体测定
自行 (μ) 赤经:-3735.839[4] mas/yr
赤纬:-1113.581[4] mas/yr
视差 (π)119.7566 ± 0.0304[4] mas
距离27.235 ± 0.007 ly
(8.350 ± 0.002 pc)
绝对星等 (MV)15.08[2][5][note 1]
詳細資料
質量0.55 ± 0.03[2] M
半徑0.013[2][note 2] R
表面重力 (log g)7.95 ± 0.02[2]
溫度5030 ± 120[2] K
年齡5.19[3][note 3] Gyr
其他命名
WD 1334+039,[2][3] Wolf 489,[1] Gliese 518,[1] LHS 46,[2] LFT 1023,[1] LTT 13961,[1] NLTT 34618,[1] G 062-053,[5] G 62-53,[1] G 64-4,[1] EGGR 100,[1] 2MASS J13363181+0340458,[1] USNO-B1.0 0936-00229354[1]
參考資料庫
SIMBAD资料

Wolf 489 (WD 1334+039, LHS 46, G 062-053, Gliese 518)是一顆位於處女座附近的白矮星,光譜分類為DZ10.0[2][3]

物理參數

Wolf 489的質量約0.55個太陽質量[2],表面重力是107.95 ± 0.02 (8.91 · 107) cm·s−2,[2]大約是地球重力的91 000倍,對應半徑9089公里,或地球半徑的143% 。

Wolf 489溫度約為5030K[2] (與早期K型主序星類似);它的冷卻年齡,即退化星的年齡(不包括主序星和巨星的壽命)是5.19 Gyr[3]。Wolf 489應該呈白色,略帶黃色,與K 型主序星的顏色幾乎相同。

註釋

  1. ^ From apparent magnitude and parallax.
  2. ^ From surface gravity and mass.
  3. ^ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

參見

參考資料

  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 GJ 518 -- White Dwarf. Centre de Données astronomiques de Strasbourg. [2011-11-02]. (原始内容存档于2023-04-17). 
  2. ^ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage. A New Look at the Local White Dwarf Population. The Astronomical Journal. 2008, 135 (4): 1225–1238 [2023-04-12]. Bibcode:2008AJ....135.1225H. S2CID 122855486. doi:10.1088/0004-6256/135/4/1225. (原始内容存档于2019-04-28). 
  3. ^ 3.0 3.1 3.2 3.3 3.4 Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic. The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics. The Astronomical Journal. 2009, 138 (6): 1681–1689. Bibcode:2009AJ....138.1681S. S2CID 119284418. arXiv:0910.1288可免费查阅. doi:10.1088/0004-6256/138/6/1681. 
  4. ^ 4.0 4.1 4.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533可免费查阅. doi:10.1051/0004-6361/202039657可免费查阅.  已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ 5.0 5.1 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)

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