寶瓶座FO

**FO Aquarii**
觀測資料; 曆元 J2000
星座	寶瓶座
星官
赤經	22h 17m 55.38s
赤緯	-08° 21′ 04.6″
視星等（V）	12.7
特性
視星等 (B)	13.70
視星等 (R)	13.60
視星等 (J)	12.87
視星等 (H)	12.75
視星等 (K)	12.51
變星類型	中介偏振星（武仙座DQ型變星）
	軌道
繞行週期 (P)	4.85 hr
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

寶瓶座FO（FO Aquarii）是位於寶瓶座的中介偏振星^[3]。

Quick Facts 觀測資料曆元 J2000, 特性 ...

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概要

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

[1]
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]
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]
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）.

[2MASS-1] [1]
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.

[GCVS-2] [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.

[Pekön2012-3] [3]
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.

[Osborne_1989-4] [4]
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] [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）.

[AAVSO-6] [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] [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）.

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觀測資料曆元 J2000
星座	寶瓶座
星官
赤經	22^h 17^m 55.38^s^[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