蜀增一

蜀增一 （巨蛇座λ，λ Ser）是在巨蛇座這個星座頭部的一顆恆星。它的視星等為4.43等，使它成為肉眼可見的恆星。依據依巴谷衛星測量的視差，估計這顆恆星與地球的距離大約是39.5光年（12.1秒差距）。僅管它與太陽有相似的恆星分類，但它比太陽更大，質量也更重。它的光度幾乎是太陽的兩倍，這些能量是來自這顆恆星的外層大氣層在有效溫度5,884K的輻射。 蜀增一的徑向速度方向是朝向太陽，其值為66.4Kms−1。大約再166,000年，這個系統將接近太陽至7.371正負0.258光年（2.260正負0.079秒差距）的距離，之後再遠離而去。 Morbey和Griffith（1887年）懷疑它有1837（5.03年）的週期變化，但它可能是有限的恆星活動。然而麥克唐納天文台的團隊已經假設它可能有一或多顆行星存在，設定行星的質量在0.16至2木星質量，在0.05和5.2天文單位的距離環繞著蜀增一。 科幻小說的蜀增一（英语：Stars and planetary systems in fiction#Lambda Serpentis） van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2018-06-15]. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2019-12-07）.  Vizier catalog entry （页面存档备份，存于互联网档案馆） Johnson, H. L.; Morgan, W. W. Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas. Astrophysical Journal. 1953, 117: 313–352. Bibcode:1953ApJ...117..313J. doi:10.1086/145697.  lam Ser -- Spectroscopic binary. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-12-15]. （原始内容存档于2020-11-05）.  Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. 1953. Bibcode:1953GCRV..C......0W.  Holmberg, J.; et al, The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics, Astronomy and Astrophysics, July 2009, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982 , doi:10.1051/0004-6361/200811191.  Valenti, J. A.; Fishcer, D. A. Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs. Astrophysical Journal Supplement Series. 2005, 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500.  van Belle, Gerard T.; von Braun, Kaspar. Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars. The Astrophysical Journal. 2009, 694 (2): 1085–1098 [2018-06-15]. Bibcode:2009ApJ...694.1085V. arXiv:0901.1206 . doi:10.1088/0004-637X/694/2/1085. （原始内容存档于2020-05-25）.  Fuhrmann, Klaus. Nearby stars of the Galactic disk and halo. Astronomy and Astrophysics. October 1998, 338: 161–183. Bibcode:1998A&A...338..161F.  Kovtyukh; Soubiran, C.; Belik, S. I.; Gorlova, N. I. High precision effective temperatures for 181 F-K dwarfs from line-depth ratios. Astronomy and Astrophysics. 2003, 411 (3): 559–564 [2018-06-15]. Bibcode:2003A&A...411..559K. arXiv:astro-ph/0308429 . doi:10.1051/0004-6361:20031378. （原始内容存档于2019-05-16）.  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.  Mamajek, Eric E.; Hillenbrand, Lynne A. Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal. November 2008, 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. arXiv:0807.1686 . doi:10.1086/591785.  Dybczyński, P. A., Simulating observable comets. III. Real stellar perturbers of the Oort cloud and their output, Astronomy and Astrophysics, April 2006, 449 (3): 1233–1242, Bibcode:2006A&A...449.1233D, doi:10.1051/0004-6361:20054284  Morbey, C. L.; Griffith, R. F. On the reality of certain spectroscopic orbits. Astrophysical Journal. 1987, 317 (1): 343–352. Bibcode:1987ApJ...317..343M. doi:10.1086/165281.  Wittenmeyer, R. A.; et al. Detection Limits from the McDonald Observatory Planet Search Program. Astronomical Journal. 2006, 132 (1): 177–188. Bibcode:2006AJ....132..177W. arXiv:astro-ph/0604171 . doi:10.1086/504942.