天船四

天船四，即英仙座ψ（ψ Persei），是一颗位于英仙座的Be星，距离地球约700光年。

天船四（英仙座ψ）
ψ Persei

观测资料 历元 J2000
星座	英仙座
星官	胃宿 天船
赤经	03h 36m 29.3789s[1]
赤纬	+48° 11′ 33.481″[1]
视星等（V）	4.310[2]
特性
光谱分类	B5Ve[3]
U−B 色指数	−0.56[4]
B−V 色指数	−0.06[4]
变星类型	仙后座γ型变星[5]
天体测定
径向速度 (Rv)	−1.1[6] km/s
自行 (μ)	赤经：+21.41[1] mas/yr 赤纬：−27.58[1] mas/yr
视差 (π)	4.66 ± 0.73[1] mas
距离	approx. 700 ly (approx. 210 pc)
详细资料
自转速度 (v sin i)	390[7] km/s
其他命名
37 Persei, BD+47 857, HD 22192, HIP 16826, HR 1087, SAO 38980.[2]

Be星是一种壳层星，在其赤道周围有气体的星周盘环绕，天船四有明显的发射光谱，视星等也在变化。^[5] 天船四的自转非常快速，赤道的投影自转速度(v sin i)至少为390 km/s。^[7]

天船四可能是疏散星团英仙座α星团的成员，但它的自行速度明显高于英仙座α星团的其他恒星。^[8]

参考资料

1. Perryman, M. A. C.; et al. The Hipparcos Catalogue. Astronomy and Astrophysics. 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P. 引文使用过时参数coauthors (帮助)
2. psi Per -- Be Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2011-02-24]. （原始内容存档于2020-11-05）.
3. Lesh, Janet Rountree. The Kinematics of the Gould Belt: an Expanding Group?. Astrophysical Journal Supplement. December 1968, 17: 371. Bibcode:1968ApJS...17..371L. doi:10.1086/190179.
4. Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99). Bibcode:1966CoLPL...4...99J.
5. Percy, John R.; Ivans, Inese I.; Fried, Robert E.; Paparo, Margit. Short-term photometric variability of Psi Persei and Zeta Tauri. Publications of the Astronomical Society of the Pacific. February 1994, 106 (696): 131–133. Bibcode:1994PASP..106..131P. doi:10.1086/133356.
6. Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (编). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union: 57–63. June 20–24, 1966. Bibcode:1967IAUS...30...57E. |year=与|date=不匹配 (帮助)
7. Bernacca, P. L.; Perinotto, M. A Catalogue of Stellar Rotational Velocities. Contributi Osservatorio Astronomico di Padova in Asiago. 1970, 239 (1). Bibcode:1970CoAsi.239....1B.
8. Morrell, Nidia; Abt, Helmut A. Spectroscopic binaries in the Alpha Persei cluster. Astrophysical Journal, Part 1. July 10, 1992, 393 (2): 666–673. Bibcode:1992ApJ...393..666M. doi:10.1086/171534.