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9 Pegasi

Star in the constellation Pegasus

Summary

Star in the constellation Pegasus

| b-v = +1.17 | u-b = +0.96

9 Pegasi (9 Peg) is a supergiant star in the constellation Pegasus. Its apparent magnitude is 4.35.

9 Pegasi is defined and used as an MK standard star for the spectral type G5 Ib. It is a yellow supergiant nearly two thousand times more luminous than the sun and sixty times larger. It has been reported to be slightly variable and is listed in the New Catalogue of Suspected Variable Stars with a magnitude range of 4.20 to 4.35.

9 Pegasi does not have a Bayer designation although it is brighter than several stars in Pegasus that do such as τ, φ, and σ Pegasi, because it was included in the constellation Battery of Volta, along with 1 Pegasi. It is the 9th star numbered by Flamsteed in order of right ascension. In the 1795 French-language Fortin-Flamsteed edition of the Atlas Coelestis, 9 Pegasi is labelled with the letter "g".

References

References

  1. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  2. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
  3. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics.
  4. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society.
  5. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society.
  6. (2009). "Supergiant temperatures and linear radii from near-infrared interferometry". Monthly Notices of the Royal Astronomical Society.
  7. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society.
  8. (1943). "An atlas of stellar spectra, with an outline of spectral classification". Chicago.
  9. (1951). "Photoelectric Studies. V. Magnitudes and Colors of Classical Cepheid Variable Stars". Astrophysical Journal.
  10. (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.
  11. (1795). "Atlas celeste". Paris: Delamarche.
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pegasus-(constellation) g-type-supergiants suspected-variables flamsteed-objects bright-star-catalogue-objects henry-draper-catalogue-objects hipparcos-objects durchmusterung-objects
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