羅斯128是一顆紅矮星,是恆星中第11靠近太陽系恆星系,距離是10.89光年。它在1926年首度被法蘭克·埃爾莫爾·羅斯記錄在星表中[9]

羅斯128
觀測資料
曆元 J2000
星座 室女座
星官
赤經 11h 47m 44.3964s[1]
赤緯 +00° 48′ 16″[1]
視星等(V) 11.13[2]
特性
光譜分類M4 V[3]
U−B 色指數2.685[4]
B−V 色指數1.59[5]
變星類型閃焰星
天體測定
徑向速度 (Rv)-13[6] km/s
自行 (μ) 赤經:605.66[1] mas/yr
赤緯:-1219.32[1] mas/yr
視差 (π)299.59 ± 2.20[1] mas
距離10.89 ± 0.08 ly
(3.34 ± 0.02 pc)
絕對星等 (MV)13.51[2]
詳細資料
質量0.15[7] M
半徑0.21[8] R
表面重力 (log g)3.40[7]
亮度0.00029[來源請求] L
溫度3,180[3] K
其他命名
FI Virginis, FI Vir, GCTP 2730, LHS 315, GJ 447, G 010-050, Vyssotsky英語Alexander N. Vyssotsky 286, LTT 13240, LFT 852, HIP 57548.[1]

這是一顆老的銀盤面星,這意味著它是低金屬量星,並且軌道接近銀河的平面[10]。由於它在數分鐘內的週期內光度就會不可預知的顯著增加,因此被分類為一顆活動中的閃焰星[11]。因為閃焰活動的頻率不高,它被認為是一顆被磁化的恆星,也就是有一些證據顯示恆星的星風有一些磁製動使閃焰的頻率降低,但不能確認是否淨效應[12]

在研究這顆恆星的多個場合的案例中顯示,這顆恆星有一顆伴星是低質量的棕矮星,在距離主星至少1天文單位的軌道上環繞者,但是迄今尚未發現任何伴星[13][14]。這顆恆星也缺乏額外的紅外線輻射,而過量的紅外線輻射通常是有塵埃環在軌道中環繞恆星的指標[15][16]

羅斯128環繞銀河的軌道與銀河核心的距離從8.22至10.49千秒差距變化,軌道離心率是0.122[17]。這個軌道會使這顆恆星在未來會更接近太陽系,大約在71,000年之後,它與太陽系的距離大約是1.911 ± 0.026秒差距.[18]

行星系統

羅斯128的行星系[19][20]
成員
(依恆星距離)
質量 半長軸
(AU)
軌道周期
()
離心率 傾角 半徑
b 1.8+0.56
−0.43
 M
0.0493±0.0017 9.8596±0.0056 0.036±0.092 1.6+1.1
−0.65
 R

相關條目

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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 The One Hundred Nearest Star Systems. Research Consortium on Nearby Stars. 2009-01-01 [2009-09-03]. (原始內容存檔於2012-05-14). 
  3. ^ 3.0 3.1 Gautier, T. N.; et al. Far Infrared Properties of M Dwarfs. Bulletin of the American Astronomical Society: 1431. Bibcode:2004AAS...205.5503G. 
  4. ^ Rufener, F. Second catalogue of stars measured in the Geneva Observatory photometric system. Astronomy & Astrophysics Supplement Series. October 1976, 26: 275–351. Bibcode:1976A&AS...26..275R. 
  5. ^ Warren, W. H., Jr. Photoelectric Photometric Catalogue of Homogeneous Means in the UBV System. Observatory (Geneva). 1978. 
  6. ^ Wilson, Ralph Elmer, General catalogue of stellar radial velocities, Washington: Carnegie Institution of Washington, 1953, Bibcode:1953QB901.W495..... 
  7. ^ 7.0 7.1 Rodonò, Marcello. The Atmospheres of M Dwarfs: Observations. Washington: NASA. : 409–453.  |booktitle=被忽略 (幫助)
  8. ^ White, Stephen M.; Jackson, Peter D.; Kundu, Mukul R. A VLA survey of nearby flare stars. Astrophysical Journal Supplement Series. December 1989, 71: 895–904. doi:10.1086/191401. 
  9. ^ Ross, Frank E. New proper-motion stars, (second list). Astronomical Journal: 124–128. doi:10.1086/104699. 
  10. ^ Sánchez, F. Vazquez, M. , 編. New windows to the universe 2. Cambridge University Press. 1990: 313. ISBN 052138429X. 
  11. ^ Kunkel, W. E. Solar neighborhood flare stars - A review. Variable stars and stellar evolution; Proceedings of the Symposium. Moscow, USSR: D. Reidel Publishing Co: 15–46. July 29-August 4, 1974. Bibcode:1975IAUS...67...15K. 
  12. ^ Skumanich, Andrew. Some evidence on the evolution of the flare mechanism in dwarf stars. Astrophysical Journal, Part 1. 1986-10-15, 309: 858–863. doi:10.1086/164654. 
  13. ^ Hinz, Joannah L.; McCarthy, Donald W., Jr.; Simons, Doug A.; Henry, Todd J.; Kirkpatrick, J. Davy; McGuire, Patrick C. A Near-Infrared, Wide-Field, Proper-Motion Search for Brown Dwarfs. The Astronomical Journal. April 2002, 123 (4): 2027–2032. doi:10.1086/339555. 
  14. ^ Schroeder, Daniel J. A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2. The Astronomical Journal. 2000, 119: 906–922. doi:10.1086/301227. 
  15. ^ Jura, M.; et al. Mid-Infrared Spectra of Dust Debris around Main-Sequence Stars. The Astrophysical Journal Supplement Series. September 2004, 154 (1): 453–457. doi:10.1086/422975. 
  16. ^ Gautier, Thomas N., III; et al. Far-Infrared Properties of M Dwarfs. The Astrophysical Journal. September 2007, 667 (1): 527–536. doi:10.1086/520667. 
  17. ^ Allen, C.; Herrera, M. A. The galactic orbits of nearby UV Ceti stars. Revista Mexicana de Astronomia y Astrofisica. 1998, 34: 37–46 [2008-06-13]. (原始內容存檔於2018-10-07). 
  18. ^ García-Sánchez, J.; Weissman, P. R.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; Latham, D. W.; Stefanik, R. P.; Paredes, J. M. Stellar encounters with the solar system. Astronomy and Astrophysics. 2001, 379: 634–659. doi:10.1051/0004-6361:20011330. 
  19. ^ 引用錯誤:沒有為名為4-planet的參考文獻提供內容
  20. ^ Tasker, Elizabeth J.; Laneuville, Matthieu; Guttenberg, Nicholas. Estimating Planetary Mass with Deep Learning. The Astronomical Journal. 7 January 2020, 159 (2): 41. Bibcode:2020AJ....159...41T. ISSN 1538-3881. S2CID 208267900. arXiv:1911.11035 . doi:10.3847/1538-3881/ab5b9e. 

外部連結