NGC 6337

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NGC 6337
Emission nebula
Planetary nebula
NGC 6337 VST.png
Image of NGC 6337 with the VLT Survey Telescope. Green part of the image was taken with the H-alpha filter.
Observation data: J2000 epoch
Right ascension 17h 22m 15.67s [1]
Declination −38° 29 01.73 [1]
Apparent dimensions (V)0.783' (arcmin) [1]
Constellation Scorpius
DesignationsGhostly Cheerio, Cheerio Nebula
See also: Lists of nebulae

NGC 6337, the Ghostly Cheerio or Cheerio Nebula, is a toroidal planetary nebula in the constellation Scorpius. It appears as a ring-shaped (annular) transparent nebula resembling a piece of the breakfast cereal Cheerios, hence the name. Filament and knots, and a faint shell surround the ring. [2] Its magnitude is 11.90; its position in Scorpius is right ascension 17h 22m15.67s, declination -38° 29' 01.73". [1] The Ghostly Cheerio has a redshift value of -0.000236.

There is convincing evidence that a binary nucleus exists at the center of the nebula, [3] with masses of 0.6 and 0.3 M⊙, and a separation of ≤ 1.26 R⊙, indicating a probable common envelope phase. The Ghostly Cheerio's projected radial expansion is slow, averaging 1–2 kilometres per second (0.6–1.2 mi/s). [2]

See also

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References

  1. 1 2 3 4 "Simbad NGC 6337". simbad.u-strasbg.fr. Retrieved August 18, 2022.
  2. 1 2 Ma. T. García-Díaz; D. M. Clark; J. A. Lopez; Wolfgang Steffen; Richer M. G. (July 2009). "The outflows and 3D structure of NGC 6337, a planetary nebula with a close binary nucleus". The Astrophysical Journal . 699 (2): 1633–1638. arXiv: 0905.1166 . doi:10.1088/0004-637X/699/2/1633. S2CID   8427963 . Retrieved August 18, 2021.
  3. Hillwig T.C.; Bond H.E.; Afasr M.; De Marco O. (16 June 2010). "Binary central stars of planetary nebulae discovered through photometric variability. II. Modeling the central stars of NGC 6026 and NGC 6337". The Astronomical Journal . 140 (2): 319–327. Bibcode:2010AJ....140..319H. doi: 10.1088/0004-6256/140/2/319 . S2CID   122179704.