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葛羅姆布里吉1830

葛羅姆布里吉1830 (Groombridge 1830)
紅點顯示出葛羅姆布里吉1830在大熊座的位置。
觀測資料
曆元 J2000
星座 大熊座
星官
赤經 11h 52m 58.7691s[1]
赤緯 +37° 43′ 07.239″[1]
視星等(V) 6.44[2]
特性
光谱分类G8Vp[3]
U−B 色指数+0.16[2]
B−V 色指数+0.75[2]
变星类型Suspected[4]
天体测定
徑向速度 (Rv)-98.0[5] km/s
自行 (μ) 赤经:4,003.69[1] mas/yr
赤纬:-5,813.00[1] mas/yr
视差 (π)109.22 ± 0.78[1] mas
距离29.9 ± 0.2 ly
(9.16 ± 0.07 pc)
绝对星等 (MV)6.62
詳細資料
質量0.661[6] M
半徑0.66[6] R
表面重力 (log g)4.68[7]
亮度0.19 L
溫度5,074[7] K
金屬量[Fe/H] = -1.33[7]
年齡(4.7–5.3) × 109[8]
其他命名
GJ 451,HR 4550, BD +38°2285, HD 103095, CF UMa, LHS 44, LTT 13276, GCTP 2745.00, SAO 62738, FK5 1307, HIP 57939.

葛羅姆布里吉1830是在大熊座內的一顆恆星。

敘述

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它是顆淡黃色的G8次矮星,史蒂芬·葛羅姆布里吉在1806年至1830年使用格魯姆布里奇子午儀發現,並在1838年發表在他身後出版的拱極星目錄中。在1842年,弗里德里希·阿格蘭德注意到它的高自行

它與太陽系的地球相距29.7光年,意味著他的絕對星等幾乎就等於視星等。它是在銀暈內的恆星,在太陽附近只有0.1%至0.2%這樣的恆星。像大多數的暈星一樣,他是貧金屬星 [9]

因為有175天的周期,曾一度懷疑是聯星,但目前的共識是單獨的一顆恆星。事實上,過去被懷疑的伴侶是觀測上的"超級閃焰" - 類似太陽的閃焰,但是能量高達數億倍[9][10]

自行

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當發現它有比任何其他恆星更高的自行時,它取代了天鵝座61的地位。稍後,因發現卡普坦星降至第二,不久又因發現巴納德星再降至第三。它比前述的恆星都遠,這意味著它有著較大的橫向速度。

實際上,太陽的運動是隨著銀河繞著中心在迴轉,但是像葛羅姆布里吉1830這一類的暈星不會隨著銀河旋轉,因此是"靜止"的,而看似以高速在"逆行"。

相關條目

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參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; et al.. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ 2.0 2.1 2.2 Argue, A. N. UBV photometry of 550 F, G and K type stars. Monthly Notices of the Royal Astronomical Society. 1966, 133: 475. Bibcode:1966MNRAS.133..475A. 
  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. 
  4. ^ Kukarkin, B. V.; et al. Catalogue of suspected variable stars. Moscow, USSR: Academy of Sciences. 1981. Bibcode:1981NVS...C......0K. 
  5. ^ Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (编). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. June 20–24, 1966 [2009-09-10]. (原始内容存档于2019-06-26). 
  6. ^ 6.0 6.1 Takeda, Genya; Ford, Eric B.; Sills, Alison; Rasio, Frederic A.; Fischer, Debra A.; Valenti, Jeff A. Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog. The Astrophysical Journal Supplement Series. February 2007, 168 (2): 297–318. Bibcode:2007ApJS..168..297T. arXiv:astro-ph/0607235可免费查阅. doi:10.1086/509763. 
  7. ^ 7.0 7.1 7.2 Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants. Astronomy and Astrophysics. March 2008, 480 (1): 91–101. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788. 
  8. ^ 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. doi:10.1086/591785. 
  9. ^ 9.0 9.1 Groombridge 1830. SolStation. [2011-07-28]. (原始内容存档于2021-02-26). 
  10. ^ Rubenstein, Eric P. Superflares and Giant Planets. American Scientist. February 2001, 89 (1): 38. Bibcode:2001AmSci..89...38R. arXiv:astro-ph/0101573可免费查阅. doi:10.1511/2001.1.38. 

外部連結

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高自行的發現

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葛羅姆布里吉1830
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