寶瓶座FOFO Aquarii)是位於寶瓶座中介偏振星[3]

FO Aquarii
觀測資料
曆元 J2000
星座 寶瓶座
星官
赤經 22h 17m 55.38s[1]
赤緯 -08° 21′ 04.6″[1]
視星等(V) 12.7[2]
特性
視星等 (B)13.70[1]
視星等 (R)13.60[1]
視星等 (J)12.87[1]
視星等 (H)12.75[1]
視星等 (K)12.51[1]
變星類型中介偏振星(武仙座DQ型變星)[3]
軌道
繞行週期 (P)4.85 hr[4]
其他命名
2E 4588, 1RXS J221753.9-082115, CS 22886-0021, H 2215-086
參考資料庫
SIMBAD資料
資料來源:
依巴谷星表CCDM (2002)、亮星星表

概要

編輯

寶瓶座FO是由白矮星與主序星組成的聯星系統,軌道週期4.85小時[4]。寶瓶座FO因為週期20.9分的極強烈可見光脈衝輻射而聞名,而這個脈衝週期與吸積中的白矮星的自轉週期相對應[5]。2016年以前,寶瓶座FO的長期可見光亮度在視星等12.7至14.2之間變化[6]。但在2016年初,寶瓶座FO的亮度曾經下降到更低的15.8等,之後緩慢恢復到原本的亮度;這樣的變化顯示兩顆恆星之間的質量傳遞率曾經暫時性地下降[7]

參考資料

編輯
  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Cutri, R. M.; Skrutskie, M. F.; van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). University of Massachusetts and Infrared Processing and Analysis Center (IPAC英語Infrared Processing and Analysis Center/California Institute of Technology). 2003. Bibcode:2003yCat.2246....0C. 
  2. ^ Samus』, N. N.; Goranskii, V. P.; Durlevich, O. V.; Zharova, A. V.; Kazarovets, E. V.; Kireeva, N. N.; Pastukhova, E. N.; Williams, D. B.; Hazen, M. L. An electronic version of the second volume of the General Catalogue of Variable Stars with improved coordinates. Astronomy Letters. 2003, 29 (7): 468–479. Bibcode:2003AstL...29..468S. doi:10.1134/1.1589864. 
  3. ^ 3.0 3.1 Pekön, Y.; Balman, Ş. Orbital-phase-resolved Spectroscopy of the Intermediate Polar FO Aqr Using XMM-Newton Observatory Data. The Astronomical Journal. 2012, 144 (2): 53. Bibcode:2012AJ....144...53P. doi:10.1088/0004-6256/144/2/53. 
  4. ^ 4.0 4.1 Osborne, J.; Mukai, K. New Orbital and Spin Ephemerides of the Intermediate Polar Fo-Aquarii = H:2215-086. Monthly Notices of the Royal Astronomical Society. 1989, 238 (3): 1233–1246. Bibcode:1989MNRAS.238.1233O. doi:10.1093/mnras/238.4.1233. 
  5. ^ Patterson, J.; Steiner, J. E. H2215-086 -King of the DQ Herculis stars. The Astrophysical Journal. 1983-01-01, 264 [2017-02-02]. ISSN 0004-637X. doi:10.1086/183944. (原始內容存檔於2018-06-08) (英語). 
  6. ^ VSX; Otero, S. A. FO Aquarii. AAVSO Website. American Association of Variable Star Observers. 24 May 2011 [10 October 2014]. (原始內容存檔於2020-08-12). 
  7. ^ Littlefield, Colin; Garnavich, Peter; Kennedy, Mark R.; Aadland, Erin; Terndrup, Donald M.; Calhoun, Grace V.; Callanan, Paul; Abe, Lyu; Bendjoya, Philippe. Return of the King: Time-series Photometry of FO Aquarii’s Initial Recovery from its Unprecedented 2016 Low State. The Astrophysical Journal. 2016-01-01, 833 (1): 93. ISSN 0004-637X. doi:10.3847/1538-4357/833/1/93 (英語).