牧夫座ZZ
牧夫座ZZ(英语:ZZ Boötis)是牧夫座的一个恒星系统。五天内星等从6.79级升到7.44级。[9]根据盖亚飞船测量的视差,它距离我们大约350光年(110秒差距)。[2]
观测资料 历元 J2000 | |
---|---|
星座 | 牧夫座 |
星官 | |
赤经 | 13h 56m 09.5178s[2] |
赤纬 | +25° 55′ 07.3547″[2] |
视星等(V) | 6.79–7.44[3] |
特性 | |
光谱分类 | F2 IV-V + F2 IV-V[4] |
B−V 色指数 | +0.36[5] |
变星类型 | Algol[3] |
天体测定 | |
径向速度 (Rv) | -29.50[6] km/s |
自行 (μ) | 赤经:±0.057 −97.004[2] mas/yr 赤纬:±0.061 −6.164[2] mas/yr |
视差 (π) | 9.3114 ± 0.0381[2] mas |
距离 | 350 ± 1 ly (107.4 ± 0.4 pc) |
轨道[4] | |
绕行周期 (P) | 4.991744 d |
倾斜角 (i) | 88.6 ± 0.1° |
半振幅 (K1) (primary) | 93.7 ± 2.1 km/s |
半振幅 (K2) (secondary) | 94.0 ± 2.1 km/s |
详细资料 | |
ZZ Boo A | |
质量 | 1.71 ± 0.06[4] M☉ |
半径 | 2.28 ± 0.06[4] R☉ |
表面重力 (log g) | 3.72 ± 0.10[7] |
亮度 | 10.7[4] L☉ |
温度 | 6,860 ± 20[7] K |
金属量 [Fe/H] | −0.10 ± 0.08[7] dex |
自转速度 (v sin i) | 11.9 ± 0.4[7] km/s |
ZZ Boo B | |
质量 | 1.70 ± 0.06[4] M☉ |
半径 | 2.15 ± 0.06[4] R☉ |
表面重力 (log g) | 3.84 ± 0.10[7] |
亮度 | 9.95[4] L☉ |
温度 | 6930 ± 20[7] K |
自转速度 (v sin i) | 19.3 ± 0.8[7] km/s |
其他命名 | |
参考数据库 | |
SIMBAD | 资料 |
观察历史
1950 年,格里戈里·沙因确定这颗恒星是双线光谱双星,周期约为4.96天。 1951年,谢尔盖·加波什金在检查照相底片时发现,这是一个大陵五型食双星系统。[10]主日食和次日食的深度相同,均为0.65等,这意味着亮度下降了近一半。[3]日食仅占轨道周期的6%。[9]
参考资料
- ^ McNamara, D. H.; Hansen, H. K.; Wilcken, S. K. Photometry of the Eclipsing Star ZZ Bootis. Publications of the Astronomical Society of the Pacific. April 1971, 83 (492): 192 [7 November 2021]. Bibcode:1971PASP...83..192M. S2CID 119982496. doi:10.1086/129099 . (原始内容存档于2021-11-07).
- ^ 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 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. Bibcode:2009yCat....102025S.
- ^ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Cester, B.; Giuricin, G.; Mardirossian, F.; Mezzetti, M. Revised spectrographic and photometric elements of ZZ Boo. Astronomy and Astrophysics Supplement Series. 1978, 32: 347–350. Bibcode:1978A&AS...32..347C.
- ^ 5.0 5.1 Popper, D. M. The F-type eclipsing binaries ZZ Bootis, CW Eridani, and BK Pegasi. Astronomical Journal. 1983, 88: 1242–56. Bibcode:1983AJ.....88.1242P. ISSN 0004-6256. doi:10.1086/113415.
- ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. SB9: The ninth catalogue of spectroscopic binary orbits. Astronomy and Astrophysics. 2004, 424 (2): 727–732. Bibcode:2004A&A...424..727P. S2CID 119387088. arXiv:astro-ph/0406573 . doi:10.1051/0004-6361:20041213.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Kang, Young-Woon; Yushchenko, Alexander; Hong, Kyengsoo; Kim, Sungeun; Yushchenko, Volodymyr. Chemical Composition of the Components of Eclipsing Binary Star ZZ Bootis. The Astronomical Journal. 2012, 144 (2): 35–45. Bibcode:2012AJ....144...35K. doi:10.1088/0004-6256/144/2/35 .
- ^ ZZ Boo. SIMBAD. 斯特拉斯堡天文资料中心.
- ^ 9.0 9.1 9.2 Watson, Christopher. ZZ Boötis. AAVSO Website. American Association of Variable Star Observers. 4 January 2010 [5 August 2014]. (原始内容存档于2021-02-14).
- ^ Gaposchkin, S. The system of RZ Eridani and a new bright eclipsing variable with double-lined spectrum. The Astronomical Journal. 1951, 56: 125. Bibcode:1951AJ.....56..125G. doi:10.1086/106546 .