G 99-47 - 维基百科,自由的百科全书

G 99-47

G 99-47的可見光帶光變曲線[1]
觀測資料
曆元 J2000[2]
星座 獵戶座
星官
赤經 05h 56m 25.47s[2]
赤緯 +05° 21′ 48.6″[2]
視星等(V) 14.105[3]
特性
光谱分类DAP8.9[4]
视星等 (B)14.69[2]
视星等 (V)14.10[2]
视星等 (R)14.0[2]
视星等 (I)13.6[2]
视星等 (J)12.930 ± 0.022[2]
视星等 (H)12.720 ± 0.025[2]
视星等 (K)12.653 ± 0.024[2]
天体测定
自行 (μ) 赤经:-444.685[5] mas/yr
赤纬:-925.140[5] mas/yr
视差 (π)123.1989 ± 0.0170[5] mas
距离26.474 ± 0.004 ly
(8.117 ± 0.001 pc)
绝对星等 (MV)14.59[3][6][note 1]
詳細資料
質量0.71 ± 0.03[3] M
半徑0.011[3][note 2] R
表面重力 (log g)8.20 ± 0.05[3]
溫度5790 ± 110[3] K
年齡3.97[4][note 3] Gyr
其他命名
WD 0553+053,[3][4] V1201 Ori,[2] LHS 212,[3] LTT 17891,[2] NLTT 15834,[2] G 099-047,[6] GJ 1087,[2] G 102-40,[2] G 106-15,[2] EGGR 290,[2] 2MASS J05562547+0521486,[2] USNO-B1.0 0953-00073703, Gaia DR2 3320184202856027776[2]
參考資料庫
SIMBAD资料

G 99-47 (獵戶座 V1201)是一顆位於獵戶座光譜分類為DAP8 (DAP8.9,[4]或DAP8.7[3])的白矮星。G 99-47為第十近的白矮星,僅次於格利澤293、格利澤518、格利澤915等。

G 99-47的質量約為是0.71±0.03太陽質量;[3]表面重力為108.20 ± 0.05 (1.58 · 108) cm·s−2,[3]或大概為地球重力的162,000倍,對應半徑7711公里,或地球半徑的121%。溫度約5790K,[3]幾乎和太陽的一樣;它的冷卻年齡,即退化恆星的年齡(不包括主序星和巨星的壽命)是3.97 Gyr[4]。由於幾乎等於太陽的溫度,G 99-47應該呈現出與太陽幾乎相同的白色。白矮星具有強磁場,近地表測得的垂直分量為560 T[7]

參見

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註釋

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  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)

參考資料

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  1. ^ Brinkworth, Carolyn S.; Burleigh, Matthew R.; Lawrie, Katherine; Marsh, Thomas R.; Knigge, Christian. Measuring the Rotational Periods of Isolated Magnetic White Dwarfs. The Astrophysical Journal. August 2013, 773 (1): 47 [10 February 2022]. Bibcode:2013ApJ...773...47B. S2CID 56285149. doi:10.1088/0004-637X/773/1/47. (原始内容存档于2023-04-12). 
  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 2.13 2.14 2.15 2.16 2.17 2.18 V* V1201 Ori -- White Dwarf. Centre de Données astronomiques de Strasbourg. [2011-11-01]. (原始内容存档于2019-01-09). 
  3. ^ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 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 [2023-04-11]. Bibcode:2008AJ....135.1225H. S2CID 122855486. doi:10.1088/0004-6256/135/4/1225. (原始内容存档于2023-04-20). 
  4. ^ 4.0 4.1 4.2 4.3 4.4 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. 
  5. ^ 5.0 5.1 5.2 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.
  6. ^ 6.0 6.1 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995). [2023-04-11]. (原始内容存档于2023-03-21). 
  7. ^ Bagnulo, Stefano; Landstreet, John D., Discovery of six new strongly magnetic white dwarfs in the 20 pc local population, Astronomy & Astrophysics, 2020, 643: A134, S2CID 222290583, arXiv:2010.05795可免费查阅, doi:10.1051/0004-6361/202038565