金牛座FU
| 观测数据 历元 J2000 分点 J2000 | |
|---|---|
| 星座 | 金牛座 |
| A | |
| 赤经 | 04h 23m 35.3912s[2] |
| 赤纬 | +25° 03′ 02.74″[2] |
| 视星等 (V) | |
| B | |
| 赤经 | 04h 23m 35.3912s[3] |
| 赤纬 | +25° 03′ 02.74″[3] |
| 视星等 (V) | |
| 特性 | |
| 光谱分类 | M7.25 + M9.25[4] |
| 视星等 (G) | 15.2[2] + 20.5[3] |
| 变星类型 | T Tau[5] |
| 天体测定 | |
| A | |
| 自行 (μ) | 赤经：6.895[2] mas/yr 赤纬：−21.026[2] mas/yr |
| 视差 (π) | 7.5981 ± 0.1497[2] mas |
| 距离 | 429 ± 8 ly (132 ± 3 pc) |
| B | |
| 自行 (μ) | 赤经：12.450[3] mas/yr 赤纬：−21.761[3] mas/yr |
| 视差 (π) | 7.4909 ± 1.2887[3] mas |
| 距离 | 435 ± 9 ly (approx. 130 pc) |
| 详细资料 | |
| A | |
| 质量 | 0.05[6] M☉ |
| 半径 | 1.8[6] R☉ |
| 亮度 | 0.2[4] L☉ |
| 温度 | 2,838[4] K |
| 年龄 | ≤1[6] Myr |
| B | |
| 质量 | 0.015[6] M☉ |
| 亮度 | 0.0039[4] L☉ |
| 温度 | 2,375[4] K |
| 年龄 | 1[6] Myr |
| Other designations | |
WDS J04236+2503A、2MASS J04233539+2503026 | |
| 参考数据库 | |
| SIMBAD | A |
| B | |
金牛座FU是在金牛座的一颗棕矮星的联星系统，距离太阳系大约429 光年。它的伴星质量非常接近棕矮星的下限，一些数据库将其列为遥远的大质量系外行星。
系统
[编辑]金牛座FU的两颗恒星相距5.7″，以金牛座FU的距离，相当于800 AU[7]。主星是一颗棕矮星，质量为0.05 M☉，而伴星的质量为0.015 M☉。伴星的质量接近棕矮星和系外行星之间的分界线，15 MJ，因此通常被视为系外行星[8]。
性质
[编辑]联星的两个成员都是低质量天体，仍然收缩朝向主序带演化。与理论进化轨迹进行比较，它们的年龄为一百万年或更少。然而，即使对于这样的年龄，主星也比预期的更明亮，并且可能比伴星年轻[6]。主星的表面有效温度为2,838 K，半径为1.8 R☉，和全波段光度为0.2 L☉。伴星温度为 2,375 K和全波段光度为0.0039 L☉[6]。
变异性
[编辑]金牛座FU的亮度会改变。主星是一颗金牛T星，分类为不规则主序前星。据观察，它的亮度从16.0的摄影星等到比17.0更暗[9]。它的摄影星等被测量为在15.1星等和17.6星等以下之间变化[10]。
参考资料
[编辑]- ^ Scholz, Alexander; Stelzer, Beate; Costigan, Grainne; Barrado, David; Eislöffel, Jochen; Lillo-Box, Jorge; Riviere-Marichalar, Pablo; Stoev, Hristo. Magnetic activity and accretion on FU Tau A: clues from variability. Monthly Notices of the Royal Astronomical Society. January 2012, 419 (2): 1271–1279. Bibcode:2012MNRAS.419.1271S. arXiv:1109.3474
. doi:10.1111/j.1365-2966.2011.19781.x .
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 4.0 4.1 4.2 4.3 4.4 Luhman, K. L.; Mamajek, E. E.; Allen, P. R.; Muench, A. A.; Finkbeiner, D. P. Discovery of a Wide Binary Brown Dwarf Born in Isolation. The Astrophysical Journal. 2009, 691 (2): 1265. Bibcode:2009ApJ...691.1265L. arXiv:0902.0425 . doi:10.1088/0004-637X/691/2/1265.
- ^ Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1: B/gcvs. Bibcode:2009yCat....102025S.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Stelzer, B.; Scholz, A.; Argiroffi, C.; Micela, G. The enigmatic young brown dwarf binary FU Tau: Accretion and activity. Monthly Notices of the Royal Astronomical Society. 2010, 408 (2): 1095–1102. Bibcode:2010MNRAS.408.1095S. S2CID 16358981. arXiv:1006.2717 . doi:10.1111/j.1365-2966.2010.17182.x.
- ^ Monin, J.-L.; Whelan, E. T.; Lefloch, B.; Dougados, C.; Alves De Oliveira, C. A molecular outflow driven by the brown dwarf binary FU Tauri. Astronomy & Astrophysics. 2013, 551: L1. Bibcode:2013A&A...551L...1M. S2CID 55550017. arXiv:1301.4387 . doi:10.1051/0004-6361/201220973.
- ^ FU Tauri. Open Exoplanet Catalogue. [2020-04-06]. （原始内容存档于2017-01-07）.
- ^ Romano, G. Observations of T Tau stars and related objects in Taurus dark cloud. Memorie della Societa Astronomica Italiana. 1975, 46: 81. Bibcode:1975MmSAI..46...81R.
- ^ Gotz, W. Photographische Untersuchungen an RW Aurigae-Sternen in den Dunkelgebieten von Taurus und Orion. Veroeffentlichungen der Sternwarte Sonneberg. 1961, 5: 87. Bibcode:1961VeSon...5...87G.
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