金牛座CQ
金牛座CQ是位于黄道星座金牛座的一颗年轻变星[5]。它太微弱了,视星等的范围在 8.7 to 12.25[4],因此肉眼无法直接看到。基于视差测量,这颗恒星的距离大约是487光年,并以~23Km/s的径向速度远离太阳系[7]。它似乎是T-星协金牛4的成员[8]。金牛座CQ离黄道足够近,因此会发生月掩星的天象[13]。
观测资料 历元 J2000.0 | |
---|---|
星座 | 金牛座 |
星官 | |
赤经 | 05h 35m 58.467s[2] |
赤纬 | 24° 44′ 54.09″[2] |
视星等(V) | 10.48[3] () 8.7 to 12.25[4] |
特性 | |
演化阶段 | 主序前星[5] |
光谱分类 | F5IVe[6] |
B−V 色指数 | 0.696+0.091 −[3] |
变星类型 | 猎户型变星[4] |
天体测定 | |
径向速度 (Rv) | 22.60+2.7 −[7] km/s |
自行 (μ) | 赤经:2.987 mas/yr 赤纬:−26.364 mas/yr |
视差 (π) | 6.6946 ± 0.0600[2] mas |
距离 | 487 ± 4 ly (149 ± 1 pc) |
绝对星等 (MV) | 5.92[8] |
详细资料 | |
质量 | 1.67[9] M☉ |
半径 | 1.7[10] R☉ |
表面重力 (log g) | 4.0[8] |
亮度 | 10[9] L☉ |
温度 | 6,900[9] K |
金属量 [Fe/H] | +0.14[11] dex |
自转速度 (v sin i) | 105.0+5.0 −[6] km/s |
年龄 | 10[9] Myr |
其他命名 | |
参考数据库 | |
SIMBAD | 资料 |
这颗恒星在1948年被阿尔朱基诺夫(Artjukinov,sp?)和1949年被库诺·霍夫迈斯特独立报导为一颗变星[14]。霍夫迈斯特将其归类为类似御夫座RW变星,亮度范围从8.7等到10.5等[15], 使其成为该类型中最明亮的成员之一[14]。G·H·赫比格在1960年发现了这颗恒星的光谱为F2[16],到1973年,它被归类为猎户型变星的金牛T星。 [17]。在1968年,沃尔德玛律·格茨和W.温泽尔发现来自系统的微弱蓝光发射[18]。
1973年该系统的光谱图像在F型恒星上显示双发射线[19]。它被IRAS发现为红外源,并与星云相关联,这使得它能够在1994年被P. S. Thé和同事编目为赫比格Ae/Be星[20]。恒星经历不规则的亮度降低,在其他方面类似于大陵五型变星。 它有一个不均匀的吸积盘绕行着,这是发射线的来源[21]。
金牛座CQ是一颗主序前星,恒星分类为F5IVe[6]。它的质量是太阳的1.67倍,辐射亮度是太阳的10倍,表面有效温度为6,900K。这颗恒星大约有1,000万年的历史[9],并且以105km/s的投影旋转速度旋转[6]。旨在再现星周盘分布的模拟表明,一颗距离为,质量为 ~20 AUMJ的 6–9 行星嵌入盘中,正在围绕该恒星运行[9]。2018年的近红外观测显示,圆盘中存在螺旋结构,这与轨道行星的存在一致。然而,并没有发现任何行星[22]。
原行星系统
编辑在2000年,甚大天线阵的观测证明了围绕恒星运行的大质量原行星盘的范围,估计盘面中的灰尘质量为×10−4 M☉ 1.5[23]。量测表明,金牛座CQ周围圆盘中的尘粒已生长到最大约一厘米大小[24],与主星相距AU以外的晶粒尺寸逐渐减小 40 [25]。来自阿塔卡玛大型毫米及次毫米波阵列的资料显示,内盘中有一个里面的气体和灰尘都耗尽了的空腔[9]。孤立的、厚厚的尘埃云随机地遮蔽著这颗恒星[26]。
在2022年,探测到原行星盘中的四个旋臂。怀疑是被一颗位于偏心倾斜轨道上,尚未发现的行星扰乱了圆盘的形状[27]。
参考资料
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|collaboration=
(帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ 3.0 3.1 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
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进阶读物
编辑- Safonov, Boris S.; et al, Apparent Motion of the Circumstellar Envelope of CQ Tau in Scattered Light, The Astronomical Journal, January 2022, 163 (1): 31, Bibcode:2022AJ....163...31S, S2CID 242757117, arXiv:2111.02726 , doi:10.3847/1538-3881/ac36cb, 31.
- Wölfer, L.; et al, A highly non-Keplerian protoplanetary disc. Spiral structure in the gas disc of CQ Tau, Astronomy & Astrophysics, April 2021, 648, Bibcode:2021A&A...648A..19W, S2CID 228064514, arXiv:2012.04680 , doi:10.1051/0004-6361/202039469, A19.
- Assani, K., Variability in the Gas and Dust Emission of the UX Orioni Star CQ Tau, Bulletin of the American Astronomical Society, January 2020, 52 (1), Bibcode:2020AAS...23545101A.
- Ubeira Gabellini, Maria Giulia, The gas and dust disk around the CQ Tau pre-main sequence star, Protoplanetary disks seen through the eyes of new-generation high-resolution instruments. Proceedings of the conference held 25–28 June 2018 in Rome, Italy, December 2018: 30, Bibcode:2018ppd..confE..30U, doi:10.5281/zenodo.1893261.
- Tax, Tomáš, Asymmetric CQ-Tau Transition Disk at High Angular Resolution, Take a Closer Look, 15–19 October 2018 in ESO-HQ, Garching b. München, Germany, November 2018: 112, Bibcode:2018tcl..confE.112T, doi:10.5281/zenodo.1488994.
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