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東海增一

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東海增一(巨蛇座ζ)
觀測資料
曆元 J2000
星座 巨蛇座
星官
赤經 18h 00m 29.0s[1] [2]
赤緯 -03° 41′ 25″[1][2]
視星等(V) 4.615[3]
特性
光譜分類F2 V[4]
U−B 色指數−0.002[3]
B−V 色指數+0.386[3]
天體測定
徑向速度 (Rv)−50.70±0.2[5] km/s
自行 (μ) 赤經:+155.51[2] mas/yr
赤緯:−44.43[2] mas/yr
視差 (π)42.46 ± 0.34[2] mas
距離76.8 ± 0.6 ly
(23.6 ± 0.2 pc)
絕對星等 (MV)2.70[6]
詳細資料 [1]
質量1.429±0.013 M
半徑1.961±0.071 R
表面重力 (log g)4.14[7]
亮度6.251±0.127 L
溫度6,529±118 K
金屬量 [Fe/H]−0.12[7] dex
自轉速度 (v sin i)69.3±3.5[6] km/s
年齡2.4±0.2 Gyr
其他命名
ζ Ser、​57 Serpentis、​BD−03° 4217、​GC 24503、​HD 164259、​HIP 88175、​HR 6710、​SAO 142025[8]
參考資料庫
SIMBAD資料

東海增一,是拜耳拉丁字母ζ命名的一顆恆星[9],它是一顆黃白色調的恆星,位於赤道上的巨蛇座。它的視星等為+4.6等,以肉眼就可以看見[3],根據太空探測器依巴谷衛星測量的視差變化42.4毫角秒周年視差,它與太陽的距離是77光年,而且正以-50.7公里/秒的徑向速度接近太陽[5]。估計它會在40萬年的時間裡,以最接近的近日點距離25.7 ly(7.88 pc)掠過太陽[10]

東海增一的年齡大約是24億歲[1],它的光譜類型是F2V [4],表示它是一顆普通的F型主序星。這顆恆星的直徑大約是太陽的2倍,質量是1.4倍,來自外大氣層有效溫度為6529k,輻射的光度是太陽的6.3倍[1]。它有一個相對較高的旋轉速度,顯示的投影旋轉速度英語Projected rotational velocity是69公里/秒[6]

參考資料

[編輯]
  1. ^ 1.0 1.1 1.2 1.3 1.4 Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars, The Astrophysical Journal, February 2012, 746 (1): 101, Bibcode:2012ApJ...746..101B, arXiv:1112.3316可免費查閱, doi:10.1088/0004-637X/746/1/101 . See Table 10.
  2. ^ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2018-05-13]. Bibcode:2007A&A...474..653V. arXiv:0708.1752可免費查閱. doi:10.1051/0004-6361:20078357. (原始內容存檔於2019-03-28).  Vizier catalog entry頁面存檔備份,存於網際網路檔案館
  3. ^ 3.0 3.1 3.2 3.3 Kozok, J. R. Photometric observations of emission B-stars in the southern Milky Way. Astronomy and Astrophysics Supplement Series. September 1985, 61: 387–405. Bibcode:1985A&AS...61..387K. 
  4. ^ 4.0 4.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, October 2003, 126 (4): 2048–2059, Bibcode:2003AJ....126.2048G, arXiv:astro-ph/0308182可免費查閱, doi:10.1086/378365 
  5. ^ 5.0 5.1 Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. November 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. arXiv:1606.08053可免費查閱. doi:10.1134/S1063773706110065. 
  6. ^ 6.0 6.1 6.2 Reiners, A., Rotation- and temperature-dependence of stellar latitudinal differential rotation, Astronomy and Astrophysics, January 2006, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399可免費查閱, doi:10.1051/0004-6361:20053911. 
  7. ^ 7.0 7.1 Balachandran, Suchitra, Lithium depletion and rotation in main-sequence stars, Astrophysical Journal, Part 1, May 1, 1990, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691 
  8. ^ * zet Peg. SIMBAD. 斯特拉斯堡天文資料中心. [2015-10-17]. 
  9. ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878可免費查閱. doi:10.1111/j.1365-2966.2008.13596.x. 
  10. ^ Bailer-Jones, C. A. L. Close encounters of the stellar kind. Astronomy & Astrophysics. March 2015, 575: 13. Bibcode:2015A&A...575A..35B. arXiv:1412.3648可免費查閱. doi:10.1051/0004-6361/201425221. A35. 
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