天牢六(56 UMa)是在大熊座的一顆恆星,視星等5.03[2]。它是一顆單線光譜聯星,軌道週期約為45年[5]。它的伴星很可能是一顆大約在10萬年前爆炸的超新星產生的大質量中子星[6]。
參考資料
- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2023-04-07]. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. (原始内容存档于2016-04-02).
- ^ 2.0 2.1 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
- ^ Lu, Phillip K. Taxonomy of barium stars. Astronomical Journal. 1991, 101: 2229–2254. Bibcode:1991AJ....101.2229L. doi:10.1086/115845.
- ^ 4.0 4.1 Fernie, J. D. New UBVRI photometry for 900 supergiants. Astrophysical Journal Supplement Series. 1983, 52 (7–22): 7. Bibcode:1983ApJS...52....7F. doi:10.1086/190856.
- ^ 5.0 5.1 Pourbaix, D.; et al. 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.
- ^ 6.0 6.1 6.2 Escorza, A.; Karinkuzhi, D.; Jorissen, A.; Van Eck, S.; Schmelz, J. T.; Verschuur, G. L.; Boffin, H. M. J.; De Rosa, R. J.; Van Winckel, H. A neutron star candidate in the long-period binary 56 UMa. Astronomy and Astrophysics. 2023, 670: L14. Bibcode:2023A&A...670L..14E. S2CID 255941814. arXiv:2301.06531 . doi:10.1051/0004-6361/202245796.