G 99-47

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G 99-47
File:V1201OriLightCurve.png
G 99-47的可见光带光变曲线[1]
观测资料
历元 J2000[2]
星座 猎户座
星官
赤经 05h 56m 25.47s[2]
赤纬 +05° 21′ 48.6″[2]
视星等（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]
详细资料
质量0.71 ± 0.03[3] M☉
半径0.011[3][note 2] R☉
表面重力 (log g)8.20 ± 0.05[3]
温度5790 ± 110[3] K
年龄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]
参考数据库
SIMBAD资料

G 99-47 (猎户座 V1201)是一颗位于猎户座光谱分类为DAP8 (DAP8.9,[4]或DAP8.7[3])的白矮星。G 99-47为第十近的白矮星，仅次于格利泽293、格利泽518、格利泽915等。

G 99-47的质量约为是0.71±0.03太阳质量;[3]表面重力为108.20 ± 0.05 (1.58 · 108) cm·s−2,[3]或大概为地球重力的162,000倍，对应半径7711公里，或地球半径的121%。温度约5790K,[3]几乎和太阳的一样；它的冷却年龄，即退化恒星的年龄（不包括主序星和巨星的寿命）是3.97 Gyr[4]。由于几乎等于太阳的温度，G 99-47应该呈现出与太阳几乎相同的白色。白矮星具有强磁场，近地表测得的垂直分量为560 T[7]。

参见[编辑]

注释[编辑]

  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)

参考资料[编辑]

  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 

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