G 99-47
| 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 | |
| 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
[编辑]註釋
[编辑]- ^ From apparent magnitude and parallax.
- ^ From surface gravity and mass.
- ^ 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
[编辑]- ^ 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）.
- ^ 2.00 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）.
- ^ 3.00 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）.
- ^ 4.0 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
. doi:10.1088/0004-6256/138/6/1681.
- ^ 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 . doi:10.1051/0004-6361/202039657 . 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. - ^ 6.0 6.1 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995). [2023-04-11]. （原始内容存档于2023-03-21）.
- ^ 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 , doi:10.1051/0004-6361/202038565
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