Surf Wiki
Save to docs
science/astronomy

From Surf Wiki (app.surf) — the open knowledge base

32 Cygni

Binary star system in the constellation Cygnus

32 Cygni

Binary star system in the constellation Cygnus

| b-v = +1.52 | u-b = +1.03

32 Cygni

32 Cygni (32 Cyg, Omicron2 Cyg, ο2 Cyg, ο3 Cyg) is a binary star system in the Cygnus constellation. It is a 4th magnitude star, which can be seen with the naked eye under suitably dark skies. Parallax measurements give an estimated distance of 1,000 light-years (307 parsecs) from the Earth.

The Bayer letter ο has been variously applied to two or three of the stars 30, 31, and 32 Cygni. 32 Cygni has been designated as either ο2 or ο3 Cygni. For clarity, it is preferred to use the Flamsteed designation 32 Cygni rather than one of the Bayer designations.

The primary component in this system, 32 Cygni A, has a stellar classification of K5 Iab, indicating that it is a supergiant star. Its effective temperature of 3,840 K lies in the range for K-type stars, giving it an orange hue. This star has over seven times more than the mass of the Sun and the outer envelope has expanded to about 184 times the Sun's radius. It is radiating 6,600 times the luminosity of the Sun.

32 Cygni B, the companion star, is three times as luminous as the Sun and four times as massive. It has a much higher effective temperature of 16,200 K and is radiating over 300 times the Sun's luminosity. This star has the blue-white hue of a B7 star main sequence star.

The two stars form an eclipsing binary system (variable star designation: V1488 Cyg) similar to Algol. The orbital plane of the two stars is nearly aligned with the line of sight from the Earth, so that the supergiant star eclipses the secondary component once per orbit. During an eclipse, emission lines can be seen in the spectrum of this system. These originate in the stellar wind escaping from the supergiant star. In a volume around the B star, this wind becomes ionized, resulting in a circumstellar H II region. The supergiant star is losing mass at the rate of times the mass of the Sun per year, or the equivalent of the Sun's mass every 77 million years.

The Washington Double Star Catalog and Catalog of Components of Double and Multiple Stars both list a visual companion 208" distant. This star is the 8th magnitude A class HD 192933.

References

References

  1. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society.
  2. (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.
  3. (1995). "The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars". Astronomy and Astrophysics.
  4. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002).
  5. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal.
  6. (1994). "Catalogue des composantes d'etoiles doubles et multiples (CCDM) premiere edition - Catalogue of the components of double and multiple stars (CCDM) first edition". Com. De l'Observ. Royal de Belgique.
  7. Ayres, Thomas. (2023-05-01). "In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022". The Astrophysical Journal Supplement Series.
  8. Wilson, Ralph Elmer. (1953). "General catalogue of stellar radial velocities". [[Carnegie Institution of Washington]].
  9. (November 1987). "32 Cyg: UBV Photometry of Eclipse in 1987". Information Bulletin on Variable Stars.
  10. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory.
  11. (October 2005). "Astrometric orbits of SB^9 stars". Astronomy and Astrophysics.
  12. (December 2007). "Mass-luminosity relation of intermediate-mass stars". Monthly Notices of the Royal Astronomical Society.
  13. {{Cite DR3. 2084154943646648320
  14. (November 2008). "Emission Lines in 32 Cygni". The Journal of Astronomical Data.
  15. (April 2007). "A critical test of empirical mass loss formulas applied to individual giants and supergiants". Astronomy and Astrophysics.
  16. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].
  17. "OMI-2 CYG (Omicron-2 = 32 Cygni)". [[University of Illinois]].
  18. (November 2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

cygnus-(constellation) bayer-objects flamsteed-objects henry-draper-catalogue-objects algol-variables k-type-supergiants b-type-main-sequence-stars bright-star-catalogue-objects hipparcos-objects durchmusterung-objects objects-with-variable-star-designations
Want to explore this topic further?

Ask Mako anything about 32 Cygni — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report