蜀增一
(重定向自巨蛇座λ)
蜀增一 (巨蛇座λ,λ Ser)是在巨蛇座这个星座头部的一颗恒星。它的视星等为4.43等[2],使它成为肉眼可见的恒星。依据依巴谷卫星测量的视差,估计这颗恒星与地球的距离大约是39.5光年(12.1秒差距)[1]。仅管它与太阳有相似的恒星分类,但它比太阳更大,质量也更重[3]。它的光度几乎是太阳的两倍,这些能量是来自这颗恒星的外层大气层在有效温度5,884K的辐射[9]。
观测资料 历元 J2000 | |
---|---|
星座 | 巨蛇座 |
星官 | |
赤经 | 15h 46m 26.614s[1] |
赤纬 | +07° 21′ 11.04″[1] |
视星等(V) | 4.43[2] |
特性 | |
光谱分类 | G0 V[3] |
U−B 色指数 | +0.11[2] |
B−V 色指数 | +0.60[2] |
变星类型 | 可疑的 |
天体测定 | |
径向速度 (Rv) | −66.4[4] km/s |
自行 (μ) | 赤经:-224.00 ± 0.29[1] mas/yr 赤纬:-70.64 ± 0.27[1] mas/yr |
视差 (π) | 83.921 ± 0.32[1] mas |
距离 | 38.9 ± 0.1 ly (11.92 ± 0.05 pc) |
绝对星等 (MV) | 4.01[5] |
详细资料 | |
质量 | 1.14[6] M☉ |
半径 | 1.060 ± 0.152[7] R☉ |
表面重力 (log g) | 4.09[8] |
亮度 | 1.94[6] L☉ |
温度 | 5,884 ± 4.4[9] K |
金属量 [Fe/H] | −0.03[8] dex |
自转速度 (v sin i) | 3[10] km/s |
年龄 | 3.8–6.7[11] Gyr |
其他命名 | |
参考数据库 | |
SIMBAD | 资料 |
蜀增一的径向速度方向是朝向太阳,其值为66.4Kms−1[4]。大约再166,000年,这个系统将接近太阳至7.371正负0.258光年(2.260正负0.079秒差距)的距离,之后再远离而去[12]。
Morbey和Griffith(1887年)怀疑它有1837(5.03年)的周期变化[13],但它可能是有限的恒星活动。然而麦克唐纳天文台的团队已经假设它可能有一或多颗行星存在[13],设定行星的质量在0.16至2木星质量,在0.05和5.2天文单位的距离环绕着蜀增一。
相关条目
编辑参考资料
编辑- ^ 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 [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)
- ^ 2.0 2.1 2.2 2.3 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.
- ^ 3.0 3.1 3.2 lam Ser -- Spectroscopic binary. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-12-15]. (原始内容存档于2020-11-05).
- ^ 4.0 4.1 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.
- ^ 6.0 6.1 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).
- ^ 8.0 8.1 Fuhrmann, Klaus. Nearby stars of the Galactic disk and halo. Astronomy and Astrophysics. October 1998, 338: 161–183. Bibcode:1998A&A...338..161F.
- ^ 9.0 9.1 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
- ^ 13.0 13.1 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.
进阶读物
编辑- 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.