Astronomy:CE Gruis

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CE Gruis
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Grus
Right ascension  21h 37m 56.38s[1]
Declination −43° 42′ 13.1″[1]

CE Gruis (previously called Grus V-1) is a faint binary star system in the constellation Grus. Its brightness changes between magnitudes 17.4 and 19.5[2] with a period of 108.6 minutes.[3] It is composed of a white dwarf and donor star, locked into a synchronous orbit. In such systems, known as polars, material from the donor star does not form an accretion disc around the white dwarf because of its intense magnetic field, but rather streams directly onto it.[4]

References

  1. 1.0 1.1 "V* CE Gru". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+CE+Gru. 
  2. Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S 1. Bibcode2009yCat....102025S. 
  3. Downes, Ronald A; Webbink, Ronald F; Shara, Michael M; Ritter, Hans; Kolb, Ulrich; Duerbeck, Hilmar W (2001). "A Catalog and Atlas of Cataclysmic Variables: The Living Edition". Publications of the Astronomical Society of the Pacific 113 (784): 764. doi:10.1086/320802. Bibcode2001PASP..113..764D. 
  4. Ramsay, Gavin; Cropper, Mark (2002). "First X-ray Observations of the Polar CE Gru". Monthly Notices of the Royal Astronomical Society 335 (4): 918–22. doi:10.1046/j.1365-8711.2002.05666.x. Bibcode2002MNRAS.335..918R. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2002MNRAS.335..918R&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf.