FO Aquarii

	FO Aquarii
Observationsdata; Epok: J2000
Stjärnbild	Vattumannen
Rektascension	22t 17m 55,38s
Deklination	-08° 21′ 04,6″
Skenbar magnitud ()	12,7
Stjärntyp
Variabeltyp	DQ Herculis-variabel
Astrometri
Radialhastighet ()	-18,0 km/s
Egenrörelse (µ)	RA: +2,276 ± 0,036 mas/år; Dek.: +4,512 ± 0,052 mas/år
Parallax ()	1,8416 ± 0,0281
Avstånd	1 770 ± 30 lå (543 ± 8 pc)
Andra beteckningar
	2E 4588, 2MASS J22175538-0821038, CS 22886-0021, H 2215-086, PB 7131, 1RXS J221753.9-082115, SDSS J221755.38-082103.7, UCAC4 409-138163, uvby98 601107131 V, FO Aquari, Gaia DR3 2616360833953395456, Gaia DR2 2616360833953395456

FO Aquarii är ett intermediärt polärt stjärnsystem i stjärnbilden Vattumannen. Den vita dvärgen och följeslagaren kretsar kring varandra med en omloppsperiod av ca 4,85 timmar. Systemet är känt för en mycket stark optisk pulsering som inträffar med en period av 20,9 minuter, vilket motsvarar rotationsperioden för den växande vita dvärgen. Före 2016 varierade systemets långsiktiga optiska ljusstyrka mellan den skenbara magnituden 12,7 och 14,2, men i början av 2016 avtog den till magnituden 15,8 och började därefter en långsam återhämtning till dess normala ljusstyrka, ett beteende som tyder på en tillfällig minskning av massöverföringshastigheten mellan de två stjärnorna.

Observation

Den variabla naturen hos FO Aquarii upptäcktes 1983 av Joseph Patterson och João Evangelista Steiner. Den fick dess variabelbeteckning 1985.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, FO Aquarii, 7 maj 2026..

Noter

1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
↑ 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. (2003). "An electronic version of the second volume of the General Catalogue of Variable Stars with improved coordinates". Astronomy Letters. 29 (7): 468–479. Bibcode:2003AstL...29..468S. doi:10.1134/1.1589864. S2CID 16299532.
1 2 Pekön, Y.; Balman, Ş. (2012). "Orbital-phase-resolved Spectroscopy of the Intermediate Polar FO Aqr Using XMM-Newton Observatory Data". The Astronomical Journal. 144 (2): 53. arXiv:1206.2215. Bibcode:2012AJ....144...53P. doi:10.1088/0004-6256/144/2/53. S2CID 119215497.
1 2 3 4 https://simbad.cds.unistra.fr/simbad/sim-id?Ident=FO+Aqr. Hämtad 2020-10-24.
↑ European Space Agency; Gaia collaboration (2020), Gaia EDR3, Centre de Donnees Strasbourg (CDS), doi:10.26093/CDS/VIZIER.1350, hämtad 2026-05-07
↑ Osborne, J.; Mukai, K. (1989). "New Orbital and Spin Ephemerides of the Intermediate Polar Fo-Aquarii = H:2215-086". Monthly Notices of the Royal Astronomical Society. 238 (3): 1233–1246. Bibcode:1989MNRAS.238.1233O. doi:10.1093/mnras/238.4.1233.
1 2 Patterson, J.; Steiner, J. E. (1983-01-01). "H2215-086 -King of the DQ Herculis stars". The Astrophysical Journal. 264: L61. Bibcode:1983ApJ...264L..61P. doi:10.1086/183944. ISSN 0004-637X.
↑ VSX; Otero, S. A. (24 May 2011). "FO Aquarii". AAVSO Website. American Association of Variable Star Observers. Hämtad 10 oktober 2014.
↑ Littlefield, Colin; Garnavich, Peter; Kennedy, Mark R.; Aadland, Erin; Terndrup, Donald M.; Calhoun, Grace V.; Callanan, Paul; Abe, Lyu; Bendjoya, Philippe (2016-01-01). "Return of the King: Time-series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State". The Astrophysical Journal. 833 (1): 93. arXiv:1609.01026. Bibcode:2016ApJ...833...93L. doi:10.3847/1538-4357/833/1/93. ISSN 0004-637X. S2CID 54662277.
↑ Littlefield, Colin; Garnavich, Peter; Kennedy, Mark R.; Aadland, Erin; Terndrup, Donald M.; Calhoun, Grace V.; Callanan, Paul; Abe, Lyu; Bendjoya, Philippe; Rivet, Jean-Pierre; Vernet, David; Devogèle, Maxime; Shappee, Benjamin; Holoien, Thomas; Heras, Teófilo Arranz; Bonnardeau, Michel; Cook, Michael; Coulter, Daniel; Debackère, André; Dvorak, Shawn; Foster, James R.; Goff, William; Hambsch, Franz-Josef; Harris, Barbara; Myers, Gordon; Nelson, Peter; Popov, Velimir; Solomon, Rob; Stein, William L.; Stone, Geoff; Vietje, Brad (December 2016). "Return of the King: Time-Series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State". The Astrophysical Journal. 833 (1): 93. arXiv:1609.01026. Bibcode:2016ApJ...833...93L. doi:10.3847/1538-4357/833/1/93. S2CID 54662277.
↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 2681. Bibcode:1985IBVS.2681....1K. Hämtad 8 oktober 2024.

[B-1] 1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.

[C-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. (2003). "An electronic version of the second volume of the General Catalogue of Variable Stars with improved coordinates". Astronomy Letters. 29 (7): 468–479. Bibcode:2003AstL...29..468S. doi:10.1134/1.1589864. S2CID 16299532.

[D-3] 1 2 Pekön, Y.; Balman, Ş. (2012). "Orbital-phase-resolved Spectroscopy of the Intermediate Polar FO Aqr Using XMM-Newton Observatory Data". The Astronomical Journal. 144 (2): 53. arXiv:1206.2215. Bibcode:2012AJ....144...53P. doi:10.1088/0004-6256/144/2/53. S2CID 119215497.

[SIMBAD-4] 1 2 3 4 https://simbad.cds.unistra.fr/simbad/sim-id?Ident=FO+Aqr. Hämtad 2020-10-24.

[E-5] European Space Agency; Gaia collaboration (2020), Gaia EDR3, Centre de Donnees Strasbourg (CDS), doi:10.26093/CDS/VIZIER.1350, hämtad 2026-05-07

[F-6] Osborne, J.; Mukai, K. (1989). "New Orbital and Spin Ephemerides of the Intermediate Polar Fo-Aquarii = H:2215-086". Monthly Notices of the Royal Astronomical Society. 238 (3): 1233–1246. Bibcode:1989MNRAS.238.1233O. doi:10.1093/mnras/238.4.1233.

[G-7] 1 2 Patterson, J.; Steiner, J. E. (1983-01-01). "H2215-086 -King of the DQ Herculis stars". The Astrophysical Journal. 264: L61. Bibcode:1983ApJ...264L..61P. doi:10.1086/183944. ISSN 0004-637X.

[H-8] VSX; Otero, S. A. (24 May 2011). "FO Aquarii". AAVSO Website. American Association of Variable Star Observers. Hämtad 10 oktober 2014.

[I-9] Littlefield, Colin; Garnavich, Peter; Kennedy, Mark R.; Aadland, Erin; Terndrup, Donald M.; Calhoun, Grace V.; Callanan, Paul; Abe, Lyu; Bendjoya, Philippe (2016-01-01). "Return of the King: Time-series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State". The Astrophysical Journal. 833 (1): 93. arXiv:1609.01026. Bibcode:2016ApJ...833...93L. doi:10.3847/1538-4357/833/1/93. ISSN 0004-637X. S2CID 54662277.

[A-10] Littlefield, Colin; Garnavich, Peter; Kennedy, Mark R.; Aadland, Erin; Terndrup, Donald M.; Calhoun, Grace V.; Callanan, Paul; Abe, Lyu; Bendjoya, Philippe; Rivet, Jean-Pierre; Vernet, David; Devogèle, Maxime; Shappee, Benjamin; Holoien, Thomas; Heras, Teófilo Arranz; Bonnardeau, Michel; Cook, Michael; Coulter, Daniel; Debackère, André; Dvorak, Shawn; Foster, James R.; Goff, William; Hambsch, Franz-Josef; Harris, Barbara; Myers, Gordon; Nelson, Peter; Popov, Velimir; Solomon, Rob; Stein, William L.; Stone, Geoff; Vietje, Brad (December 2016). "Return of the King: Time-Series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State". The Astrophysical Journal. 833 (1): 93. arXiv:1609.01026. Bibcode:2016ApJ...833...93L. doi:10.3847/1538-4357/833/1/93. S2CID 54662277.

[J-11] Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 2681. Bibcode:1985IBVS.2681....1K. Hämtad 8 oktober 2024.