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房宿增一

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房宿增一(天秤座λ)
觀測資料
曆元 J2000.0
星座 天秤座
星官
赤經 15h 53m 20.05463s[1]
赤緯 −20° 10′ 01.4177″[1]
視星等(V) 5.03[2]
特性
光譜分類B3 V[3]
U−B 色指數−0.584[2]
B−V 色指數−0.023[2]
變星類型旋轉橢球[4]
天體測定
徑向速度 (Rv)−2.0±0.5[5] km/s
自行 (μ) 赤經:−9.81[1] mas/yr
赤緯:−26.85[1] mas/yr
視差 (π)10.54 ± 0.91[1] mas
距離310 ± 30 ly
(95 ± 8 pc)
絕對星等 (MV)0.56[6]
軌道[7]
繞行週期 (P)14.4829±0.0004 d
偏心率 (e)0.27±0.09
近心點 曆元 (T)2435172.380 ± 0.664 JD
近心點幅角 (ω)
(secondary)
217±17°
半振幅 (K1)
(primary)
28.5±3.3 km/s
詳細資料
質量5.01±0.26[8] M
半徑3.9[9] R
表面重力 (log g)4.75
亮度743[8] L
溫度18,700[8] K
金屬量 [Fe/H]−0.27 dex
自轉速度 (v sin i)155[10] km/s
年齡282[6] Myr
其他命名
λ Lib45 LibBD−19°4249、FK5 1415、HD 142096、 HIP 77811、HR 5902、SAO 183895。[11]
參考資料庫
SIMBAD資料

房宿增一拉丁文名稱為Lambda Librae)是黃道星座天秤座聯星拜耳名稱天秤座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[2]。年周視差10.54mas[1],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[6]

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[7]。可以見到的成員是B型主序星光譜類型B3V[3]。它是光譜特殊弱氦星[12],並且是顆旋轉橢球變星[4]。估計它的半徑是太陽的3.9倍[9],質量是太陽的5倍[8]。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[13]。這個系統也是個X射線源[14]

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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可免費查閱, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 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. 
  3. ^ 3.0 3.1 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. 
  4. ^ 4.0 4.1 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. 
  5. ^ 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可免費查閱, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ 6.0 6.1 6.2 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可免費查閱, doi:10.1134/S1063773712110035. 
  7. ^ 7.0 7.1 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可免費查閱, doi:10.1051/0004-6361:20041213. 
  8. ^ 8.0 8.1 8.2 8.3 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可免費查閱, doi:10.1002/asna.200911355. 
  9. ^ 9.0 9.1 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可免費查閱, doi:10.1051/0004-6361:20000451. 
  10. ^ Abt, Helmut A.; et al, Rotational Velocities of B Stars, The Astrophysical Journal, 2002, 573: 359, Bibcode:2002ApJ...573..359A, doi:10.1086/340590可免費查閱. 
  11. ^ lam Lib -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-01-30], (原始內容存檔於2020-11-05). 
  12. ^ 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, (原始內容存檔 (PDF)於2020-09-15). 
  13. ^ 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可免費查閱, doi:10.1051/0004-6361:200810260. 
  14. ^ 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.