AR Scorpii

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Double star
AR Scorpii
artist's impression of the binary star system
artist's impression of the binary star system
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Scorpio
Right ascension 16 h 21 m 47.28 s
declination −22 ° 53 ′ 10.4 ″
Apparent brightness 14.58 mag
Typing
B − V color index +0.36 
Spectral class WD + M5 Ve
Astrometry
parallax (8.49 ± 0.04)  mas
distance (384 ± 2)  ly
(118)  pc
Proper movement 
Rec. Share: (+9.71 ± 0.10)  mas / a
Dec. portion: (−51.47 ± 0.07)  mas / a
Physical Properties
Dimensions (0.81 to 1.29) / (0.28 to 0.45)  M ☉
Rotation time (118 s )
Other names
and catalog entries
2MASS catalog 2MASS J16214728-2253102 [1]
Other names AR Scorpii

AR Scorpii is a variable binary star system consisting of a white dwarf and a red dwarf in the constellation Scorpio . It is roughly 384 light years away . The system was originally thought to be a variable Delta Scuti single star . It was only through amateur astronomers that it was recognized that the star system was something special, for which the system was examined more closely. Accordingly, the binary star nature was only discovered in 2016.

properties

The white dwarf rotates around its axis every 118 seconds and transmits radio waves (similar to a pulsar ), making it the first white dwarf pulsar. It has a magnetic field with a magnetic flux density of around 50 kilotesla . The red dwarf lights up (due to the radiation from the white dwarf) every 3.55 hours.

Individual evidence

  1. ↑ a b c d e AR Sco. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 8, 2018 .
  2. ↑ AR Sco. In: VSX. AAVSO, accessed December 8, 2018 .
  3. ↑ a b c d Marsh, TR et al .: A radio-pulsing white dwarf binary star . In: Nature . 537, No. 7620, pp. 374-377. arxiv : 1607.08265 . bibcode : 2016Natur.537..374M . doi : 10.1038 / nature18620 .
  4. ↑ Norbert Lossau: Researchers are puzzling over the mysterious white dwarf. Welt.de, accessed on December 8, 2018 .
  5. ↑ Le Buckley, DAH et al .: Polarimetric evidence of a white dwarf pulsar in the binary system AR Scorpii . In: Nature Astronomy . 1. arxiv : 1612.03185 . bibcode : 2017NatAs ... 1E..29B . doi : 10.1038 / s41550-016-0029 .