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AE Aquarii is a cataclysmic variable binary star of the DQ Herculis type. Based upon parallax measurements, the system is located at a distance of about 280 light-years (86 parsecs) from the Earth.[1] Because of its unique properties, this system has been subject to a number of scientific studies.[3] The white dwarf in the AE Aquarii system is the first star of its type known to give off pulsar-like pulsations that are powered by its rotation and particle acceleration.[9][10]

A visual band light curve for AE Aquarii. The main plot shows the long term variability, and the inset plot shows the short term variability over one orbital period. Adapted from Šimon (2020).[11]
A visual band light curve for AE Aquarii. The main plot shows the long term variability, and the inset plot shows the short term variability over one orbital period. Adapted from Šimon (2020).[11]
AE Aquarii

Artistic illustration of the AE Aquarii system
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 20h 40m 09.16206s[1]
Declination −00° 52′ 15.0618″[1]
Apparent magnitude (V) 11.6[2]
Characteristics
Spectral type White dwarf + K4–5 V[3]
B−V color index −1.2[2]
Variable type DQ Her
Astrometry
Radial velocity (Rv)−53[4] km/s
Proper motion (μ) RA: +73.95[1] mas/yr
Dec.: +12.40[1] mas/yr
Parallax (π)11.61 ± 2.72 mas[1]
Distanceapprox. 280 ly
(approx. 90 pc)
Absolute magnitude (MV)~6.6[5]
Orbit[6]
Period (P)9.88 hours
Semi-major axis (a)2.34 ± 0.02 R☉
Inclination (i)70 ± 3°
Details
A
Mass0.63 ± 0.05[6] M☉
Radius0.01[7] R☉
Rotation33.08 sec[8]
B
Mass0.37 ± 0.04[6] M☉
Radius0.79[6] R☉
Other designations
2E 2037.5-0102, GCRV 71273, 1RXS J204009.4-005216, AN 342.1931, 2E 4404, GSC 05177-00636, SBC7 826, 1AXG J204011-0052, RJHA 119, CSI-01-20376, CDS 1178, HIP 101991, 1E 2037.5-0102, 1ES 2037-01.0, 2MASS J20400915-0052151, AAVSO 2035-01.[2]
Database references
SIMBADdata

The AE Aquarii system consisting of an ordinary star in a close orbit around a magnetic white dwarf; the pair orbit each other with a period of 9.88 hours. The white dwarf primary has 63% of the Sun's mass but a radius of only about 1% of the Sun. As of 2009, it has the shortest known spin period of any white dwarf, completing a full revolution every 33.08 seconds. This spin is decreasing at a rate of 1.78 ns per year, which is unusually high.[3] The secondary star has a stellar classification of K4-5 V, making it a main sequence star that is generating energy at its core through the thermonuclear fusion of hydrogen. It has about 37% of the Sun's mass but 79% of the Sun's radius.

This system displays flare activity that has been observed across multiple bands of the electromagnetic spectrum, including X-rays. Mass is being lost from the secondary star, most of which is being flung out of the system by the rapidly spinning magnetic primary. The X-ray luminosity is likely being caused by the accretion of mass onto the white dwarf, which is occurring at an estimated rate of about 7.3 × 1010 kg per second.[3]


See also



References


  1. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. "V* AE Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 22, 2008.
  3. Mauche, Christopher W. (November 2009), "Chandra High-Energy Transmission Grating Spectrum of AE Aquarii", The Astrophysical Journal, 706 (1): 130–141, arXiv:0910.0084, Bibcode:2009ApJ...706..130M, doi:10.1088/0004-637X/706/1/130, S2CID 16457151
  4. Evans, D. S. (June 20–24, 1966). Batten, Alan Henry; Heard, John Frederick (eds.). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications, Proceedings from IAU Symposium. University of Toronto: International Astronomical Union. 30: 57. Bibcode:1967IAUS...30...57E.
  5. From apparent magnitude and parallax.
  6. Echevarría, J.; et al. (July 2008). "High-dispersion absorption-line spectroscopy of AE Aqr". Monthly Notices of the Royal Astronomical Society. 387 (4): 1563–1574. arXiv:0804.0291. Bibcode:2008MNRAS.387.1563E. doi:10.1111/j.1365-2966.2008.13248.x. S2CID 11324791.
  7. Itoh, Kei; et al. (2005). "Density diagnostics of the hot plasma in AE Aquarii with XMM-NEWTON" (PDF). The Astrophysical Journal. 639 (1): 397–404. arXiv:astro-ph/0412559. Bibcode:2006ApJ...639..397I. doi:10.1086/499152. S2CID 14578720.
  8. Patterson, Joseph (December 15, 1979). "Rapid oscillations in cataclysmic variables. III. An oblique rotator in AE Aquarii". Astrophysical Journal. 234: 978. Bibcode:1979ApJ...234..978P. doi:10.1086/157582.
  9. Terada, Yukikatsu; Hayashi, Takayuki; Ishida, Manabu; Mukai, Koji; Dotani, Tadayasu; Okada, Shunsaku; Nakamura, Ryoko; Naik, Sachindra; Bamba, Aya; Makishima, Kazuo (2008-04-25). "Suzaku Discovery of Hard X-Ray Pulsations from a Rotating Magnetized White Dwarf, AEAquarii". Publications of the Astronomical Society of Japan. 60 (2): 387–397. Bibcode:2008HEAD...10.1003T. doi:10.1093/pasj/60.2.387. ISSN 0004-6264.
  10. "NASA - White Dwarf Pulses Like a Pulsar". www.nasa.gov. Retrieved 2021-12-13.
  11. Šimon, Vojtěch (April 2020). "The long-term optical activity of the propellers AE Aquarii and AR Scorpii". Publications of the Astronomical Society of Japan. 72 (2). doi:10.1093/pasj/psaa012.



На других языках

[de] AE Aquarii

AE Aquarii auch AE Aqr ist ein kataklysmisch veränderliches Doppelsternsystem vom Typ DQ-Herculis. Es besteht aus einem magnetischen Weißen Zwerg, mit einer Masse von etwa 0,63 M☉, und ca. 0,01 R☉. Er befindet sich in enger Umlaufbahn mit einem massearmen Hauptreihenstern mit etwa 0,76 M☉ und 0,79 R☉[4] der Spektralklasse K3-5 V, der in seinem Kern Wasserstoff zu Helium fusioniert aber sein Roche-Volumen ausfüllt.[5] Beide umkreisen sich um den gemeinsamen Schwerpunkt mit einer Periodendauer von 9,88 Stunden. Der Weiße Zwerg hat die kürzeste bekannte Rotationsdauer aller Weißen Zwerge mit 33,08 Sekunden pro Umdrehung, die mit einer ungewöhnlich hohen Rate von 1,78 ns pro Jahr zunimmt.[6]
- [en] AE Aquarii

[es] AE Aquarii

AE Aquarii (AE Aqr / HIP 101991 / GCRV 71273) es una estrella variable en la constelación de Acuario situada a 332 años luz del Sistema Solar. Es una estrella binaria interactuante, en donde existe transferencia de masa entre las dos componentes, una enana blanca y una estrella naranja; gas procedente de esta última cae en espiral hacia la enana blanca y se calienta, produciendo una emisión de rayos X blandos. Como consecuencia, AE Aquarii es una variable cataclísmica que experimenta cambios impredecibles en su brillo, que varía entre magnitud aparente +10,40 y +12,56. El período orbital del sistema es de 9,89 horas.

[ru] AE Водолея

AE Водолея (лат. AE Aquarii) — промежуточный поляр, двойная катаклизмическая переменная звезда типа DQ Геркулеса (XM), эллипсоидальная переменная звезда (ELL) в созвездии Водолея на расстоянии приблизительно 297 световых лет (около 91 парсека) от Солнца. Видимая звёздная величина звезды — от +12,12m до +10,18m[6]. Орбитальный период — около 9,88 часов.


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