金牛座BP

金牛座BP是在金牛座的一颗年轻的金牛T星，属于金牛座分子云，距离太阳大约7002416000000000000♠416 光年。

金牛座BP

依据凌日系外行星巡天卫星（TESS） 的数据，绘制的金牛座BP光变曲线[1]
观测资料 历元 J2000
星座	金牛座
星官
赤经	04h 19m 15.8343s[2]
赤纬	+29° 06′ 26.9295″[2]
视星等（V）	12.12
特性
演化阶段	主序前星
光谱分类	K5
视星等 (G)	11.460[3]
变星类型	T Tau
天体测定
径向速度 (Rv)	15.76+0.13 − km/s
自行 (μ)	赤经：8.889[3] mas/yr 赤纬：-26.011[3] mas/yr
视差 (π)	7.8494 ± 0.0362[3] mas
距离	416 ± 2 ly (127.4 ± 0.6 pc)
详细资料
质量	1.24+0.25 −0.32[4] M☉
半径	2.0[5] R☉
表面重力 (log g)	4.32+0.14 −[6]
亮度	0.93[5] L☉
温度	3640+94 −92[6] K
自转速度 (v sin i)	11.4+0.25 −0.55[6] km/s
年龄	6+4 −[4] Myr
其他命名
HD 281934、​HIP 20160、​TYC 1827-554-1、​GSC 01827-00554、​2MASS J04191583+2906269
参考数据库
SIMBAD	资料

性能

金牛座BP仍然以6990900000000000000♠9×10⁻¹⁰ 太阳质量和6993160000000000000♠1.6×10⁻⁷ 太阳质量/年的低速率吸积质量^[7]，正如落入物质产生的X射线所证明的那样^[8]，并且可能仍在旋转过程中^[9]。它的色球磁场相当强，为2.5+0.15
−0.16千高斯^[6]，并含有强的非偶极子成分^[10]。这颗恒星有40%的光度是通过吸积释放的能量产生^[5]。

疑似伴星

金牛座BP有两个可疑的恒星伴星，预计分离3.00和7000545000000000000♠5.45 弧秒^[11]。不过现在已经被盖亚任务的数据证明，是与金牛座BP无关的背景恒星^[12][13]。

原行星系统

这颗恒星被原行星盘包围。圆盘中强烈的在消耗碳和一氧化碳^[14]。

金牛座BP的行星系

成员 (依恒星距离)	质量	半长轴 (AU)	轨道周期 (天)	离心率	倾角	半径
原行星盘	0 — 120[15] AU				30[14]°	—

变异性

由于不稳定的吸积而产生强烈的耀斑，与恒星磁场控制，使金牛座BP有着不同的亮度^[5]。光变曲线周期在 6.1 至 7.6 天之间变化，并且已知也有没有变化的静止周期^[16]。

参考资料

1. MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021]. （原始内容存档于2023-03-27）.
2. V* BP Tau. SIMBAD. 斯特拉斯堡天文资料中心.
3. 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.
4. Simon, M.; Dutrey, A.; Guilloteau, S., Dynamical Masses of T Tauri Stars and Calibration of Pre–Main‐Sequence Evolution, The Astrophysical Journal, 2000, 545 (2): 1034–1043, Bibcode:2000ApJ...545.1034S, S2CID 18064837, arXiv:astro-ph/0008370 , doi:10.1086/317838
5. Errico, L.; Lamzin, S. A.; Vittone, A. A., UV spectra of T Tauri stars from the HST and IUE satellites: BP Tau, Astronomy & Astrophysics, 2001, 377 (2): 557–565, Bibcode:2001A&A...377..557E, doi:10.1051/0004-6361:20011108 
6. Flores, C.; Connelley, M. S.; Reipurth, B.; Boogert, A., Measuring the Magnetic Field of Young Stars Using iSHELL Observations: BP Tau and V347 Aur, The Astrophysical Journal, 2019, 882 (2): 75, Bibcode:2019ApJ...882...75F, S2CID 201645503, arXiv:1908.08583 , doi:10.3847/1538-4357/ab35d4
7. Long, M.; Romanova, M. M.; Kulkarni, A. K.; Donati, J.-F., Global 3D simulations of disc accretion on to the classical T Tauri star BP Tauri, Monthly Notices of the Royal Astronomical Society, 2010, 413 (2): 1061–1071, S2CID 55134816, arXiv:1009.3300 , doi:10.1111/j.1365-2966.2010.18193.x
8. Schmitt, J. H. M. M.; Robrade, J.; Ness, J.-U.; Favata, F.; Stelzer, B., X-rays from accretion shocks in T Tauri stars: The case of BP Tau, Astronomy & Astrophysics, 2005, 432 (2): L35–L38, Bibcode:2005A&A...432L..35S, S2CID 2457531, arXiv:astro-ph/0503144 , doi:10.1051/0004-6361:200500014
9. Ireland, Lewis G.; Zanni, Claudio; Matt, Sean P.; Pantolmos, George, Magnetic Braking of Accreting T Tauri Stars: Effects of Mass Accretion Rate, Rotation, and Dipolar Field Strength, The Astrophysical Journal, 2020, 906: 4, S2CID 226236865, arXiv:2011.01087 , doi:10.3847/1538-4357/abc828
10. Long, Min; Romanova, Marina M.; Lamb, Frederick K., Accretion onto stars with octupole magnetic fields: Matter flow, hot spots and phase shifts, New Astronomy, 2009, 17 (2): 232–245, Bibcode:2012NewA...17..232L, S2CID 119113916, arXiv:0911.5455 , doi:10.1016/j.newast.2011.08.001
11. Itoh, Yoichi; Tamura, Motohide; Hayashi, Masahiko; Oasa, Yumiko; Hayashi, Saeko S.; Fukagawa, Misato; Kudo, Tomoyuki; Mayama, Satoshi; Ishii, Miki; Pyo, Tae-Soo; Yamashita, Takuya; Morino, Junichi. Near-Infrared Spectroscopy of Faint Companions around Young Stellar Objects Associated with the Taurus Molecular Cloud. Publications of the Astronomical Society of Japan. 2008, 60 (2): 209–218. Bibcode:2008PASJ...60..209I. doi:10.1093/pasj/60.2.209 .
12. 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.
13. 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.
14. Kama, M.; Bruderer, S.; Carney, M.; Hogerheijde, M.; Van Dishoeck, E. F.; Fedele, D.; Baryshev, A.; Boland, W.; Güsten, R.; Aikutalp, A.; Choi, Y.; Endo, A.; Frieswijk, W.; Karska, A.; Klaassen, P.; Koumpia, E.; Kristensen, L.; Leurini, S.; Nagy, Z.; Perez Beaupuits, J. -P.; Risacher, C.; Van Der Marel, N.; Van Kempen, T. A.; Van Weeren, R. J.; Wyrowski, F.; Yıldız, U. A. Observations and modelling of CO and [C I] in protoplanetary disks. First detections of [C I] and constraints on the carbon abundance. Astronomy and Astrophysics. 2016, 588: 588. Bibcode:2016A&A...588A.108K. S2CID 53941444. arXiv:1601.01449 . doi:10.1051/0004-6361/201526791.
15. Dutrey, A.; Guilloteau, S.; Simon, M. The BP Tau disk: A missing link between Class II and III objects?. Astronomy and Astrophysics. 2003, 402 (3): 1003. Bibcode:2003A&A...402.1003D. doi:10.1051/0004-6361:20030317 .
16. Simon, Theodore; Vrba, Frederick J.; Herbst, William. The Ultraviolet and Visible Light Variability of BP Tauri: Possible Clues for the Origin of T Tauri Star Activity. The Astronomical Journal. 1990, 100: 1957. Bibcode:1990AJ....100.1957S. doi:10.1086/115651.