房宿增一

房宿增一（拉丁文名稱為Lambda Librae）是黃道星座天秤座的聯星，拜耳名稱是天秤座λ。它是顆黯淡的恆星，視星等 +5.03，在漆黑的夜晚肉眼隱約可見。年周視差10.54mas，因此與太陽的距離是310光年。在這樣的距離上，星際塵埃造成的消光使它的視星等降低0.22等。 它是只有單一光譜線的光譜聯星，軌道週期14.48天，離心率0.27。可以見到的成員是B型主序星，光譜類型B3V。它是光譜特殊的弱氦星，並且是顆旋轉橢球變星。估計它的半徑是太陽的3.9倍，質量是太陽的5倍。它是類織女的候選者，意味著它有環繞著恆星的岩屑盤引起的紅外過量特徵。這個系統也是個X射線源。 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.  Gutierrez-Moreno, Adelina; Moreno, Hugo, A photometric investigation of the Scorpio-Centaurus association, Astrophysical Journal Supplement, June 1968, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.  Houk, Nancy; Smith-Moore, M., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1978, Bibcode:1988mcts.book.....H.  Hoffleit, Dorrit, A Catalogue of Correlations Between Eclipsing Binaries and Other Categories of Double Stars, The Journal of the American Association of Variable Star Observers, 1996, 24 (2): 105–116, Bibcode:1996JAVSO..24..105H.  de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.  Gontcharov, G. A., Spatial distribution and kinematics of OB stars, Astronomy Letters, November 2012, 38 (11): 694–706, Bibcode:2012AstL...38..694G, arXiv:1606.09028 , doi:10.1134/S1063773712110035.  Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al, SB9: The ninth catalogue of spectroscopic binary orbits, Astronomy & Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.  Hohle, M. M.; Neuhäuser, R.; Schutz, B. F., Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335 , doi:10.1002/asna.200911355.  Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics, Astronomy and Astrophysics, February 2001, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.  Abt, Helmut A.; et al, Rotational Velocities of B Stars, The Astrophysical Journal, 2002, 573: 359, Bibcode:2002ApJ...573..359A, doi:10.1086/340590 .  lam Lib -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-01-30], （原始内容存档于2020-11-05）.  Renson, P.; Manfroid, J., Catalogue of Ap, HgMn and Am stars (PDF), Astronomy and Astrophysics, May 2009, 498 (3): 961–966 [2020-05-24], Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788, （原始内容存档 (PDF)于2020-09-15）.  Saffe, C.; Gómez, M.; Pintado, O.; González, E., Spectroscopic metallicities of Vega-like stars, Astronomy and Astrophysics, October 2008, 490 (1): 297–305, Bibcode:2008A&A...490..297S, arXiv:0805.3936 , doi:10.1051/0004-6361:200810260.  Berghoefer, T. W.; Schmitt, J. H. M. M.; Cassinelli, J. P., The ROSAT all-sky survey catalogue of optically bright OB-type stars, Astronomy and Astrophysics Supplement, September 1996, 118: 481–494, Bibcode:1996A&AS..118..481B.