天船四
天船四，即英仙座ψ（ψ Persei），是一顆位於英仙座的Be星，距離地球約700光年。
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 英仙座 |
| 星官 | 胃宿 天船 |
| 赤經 | 03h 36m 29.3789s[1] |
| 赤緯 | +48° 11′ 33.481″[1] |
| 視星等（V） | 4.310[2] |
| 特性 | |
| 光譜分類 | B5Ve[3] |
| U−B 色指數 | −0.56[4] |
| B−V 色指數 | −0.06[4] |
| 變星類型 | 仙后座γ型變星[5] |
| 天體測定 | |
| 徑向速度 (Rv) | −1.1[6] km/s |
| 自行 (μ) | 赤經：+21.41[1] mas/yr 赤緯：−27.58[1] mas/yr |
| 視差 (π) | 4.66 ± 0.73[1] mas |
| 距離 | approx. 700 ly (approx. 210 pc) |
| 詳細資料 | |
| 自轉速度 (v sin i) | 390[7] km/s |
| 其他命名 | |
Be星是一種殼層星，在其赤道周圍有氣體的星周盤環繞，天船四有明顯的發射光譜，視星等也在變化。[5] 天船四的自轉非常快速，赤道的投影自轉速度(v sin i)至少為390 km/s。[7]
參考資料
- ^ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; et al. The Hipparcos Catalogue. Astronomy and Astrophysics. 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ 2.0 2.1 psi Per -- Be Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2011-02-24]. （原始內容存檔於2020-11-05）.
- ^ 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.
- ^ 4.0 4.1 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.
- ^ 5.0 5.1 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.
- ^ Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (編). 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=與|date=不匹配 (幫助) - ^ 7.0 7.1 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.
- ^ 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.