Gamma Persei

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Binary star system in the constellation Perseus

title: "Gamma Persei" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["bayer-objects", "perseus-(constellation)", "flamsteed-objects", "hipparcos-objects", "eclipsing-binaries", "g-type-giants", "a-type-main-sequence-stars", "bright-star-catalogue-objects", "henry-draper-catalogue-objects", "durchmusterung-objects"] description: "Binary star system in the constellation Perseus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Gamma_Persei" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Binary star system in the constellation Perseus ::

| name = γ Persei | image= |image=Perseus constellation map.svg|alt=|float=center|width=260 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=γ Per |x=625|y=316 |caption=Location of γ Persei (circled) | epoch = J2000.0 | constell = Perseus | ra = | dec = | appmag_v = 2.93 | class = G8III + A2V | b-v = +0.70 | u-b = +0.45 | variable = EA | radial_v = +2.5 | prop_mo_ra = | prop_mo_dec = | pm_footnote =
| parallax = 14.735 | p_error = 0.188 | parallax_footnote = | dist_footnote = | absmag_v = –1.50 (–1.23/0.01) | reference = | period = 14.6 | axis = 0.144 | eccentricity = 0.785 | inclination = 90.9 | node = 244.1 | periastron = 1991.08 Besselian | periarg = 170.0 | source = | component1 = γ Per A | mass = | radius = | gravity = | metal_fe = –0.19 | age_myr = | luminosity = 282 | temperature = | rotational_velocity = 50.0 | rotation = 5,350 days | component2 = γ Per B | mass2 = | radius2 = | temperature2 = | gravity2 = | luminosity2 = 67.6 | names = γ Persei, γ Per, Gamma Per, 23 Persei, BD+52 654, CCDM J03048+5331AP, FK5 108, GC 3664, HD 18925, HIP 14328, HR 915, IDS 02576+5307 AP, PPM 28201, SAO 23789, WDS J03048+5330Aa,Ab. |Simbad=Gamma+Persei Gamma Persei (Gamma Per, γ Persei, γ Per) is a binary star system in the constellation Perseus. The combined apparent visual magnitude of the pair is +2.9, making it the fourth-brightest member of the constellation. The distance to this system is of roughly 221 ly with a 1% margin of error. About 4° to the north of Gamma Persei is the radiant point for the annual Perseid meteor shower.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/28/Gamma_Persei_TESS_lightcurve.png" caption="Lightcurve of Gamma Persei's 2019 eclipse recorded by NASA's [[Transiting Exoplanet Survey Satellite]] (TESS)."] ::

This is a wide eclipsing binary system with an orbital period of 5,329.8 days (14.6 years). This eclipse was first observed in 1990 and lasted for two weeks. During an eclipse, the primary passes in front of the secondary, causing the magnitude of the system to decrease by 0.55. The primary component of this system is a giant star with a stellar classification of G9 III. It has a projected rotational velocity of 50.0 km s−1 and a lengthy estimated rotation period of 14.6 years. The classification of the secondary remains tentative, with assignments of A3 V and A2(III).

Mass estimates for the two stars remain disparate. Using speckle interferometry, McAlister (1982) obtained mass estimates of for the primary and for the secondary, where is the mass of the Sun. He noted that the mass estimate was too high for the given classification of the primary. Martin and Mignard (1998) determined masses for both components based on data from the Hipparcos mission: for the primary and for the secondary. They admit that the high inclination of the orbit resulted in a large margin of error. Prieto and Lambert (1999) came up with a mass estimate of for the primary, while Pizzolato and Maggio (2000) obtained . Ling et al. (2001) obtained estimates of for the primary and for the secondary, while Kaler (2001) obtained 2.5 and 1.9, respectively. Diamant et al. (2023) found masses of for A and B respectively.

Name and etymology

  • This star, together with δ Per, ψ Per, σ Per, α Per and η Per, has been called the Segment of Perseus.{{cite book | last=Allen | first=R. H. | date=1963 | author-link=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/331 | access-date=2012-09-04 | edition=Reprint | publisher=Dover Publications Inc. | location=New York | isbn=0-486-21079-0 | page=331 | url-access=registration
  • In Chinese, 天船 (Tiān Chuán), meaning Celestial Boat, refers to an asterism consisting of γ Persei, η Persei, α Persei, ψ Persei, δ Persei, 48 Persei, μ Persei and HD 27084. Consequently, the Chinese name for γ Persei itself is 天船二 (Tiān Chuán èr, .)

References

References

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  2. {{in lang. zh [http://aeea.nmns.edu.tw/2006/0607/ap060711.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日] {{Webarchive. link. (2012-02-04)
  3. Diamant, S. J. M.. (2023-06-01). "Discovery of an extended G giant chromosphere in the 2019 eclipse of γ Per". Astronomy & Astrophysics.
  4. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics.
  5. (December 1990). "High-resolution spectroscopic survey of 671 GK giants". Astrophysical Journal Supplement Series.
  6. Wilson, Ralph Elmer. (1953). "General Catalogue of Stellar Radial Velocities". [[Carnegie Institution of Washington]].
  7. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory.
  8. (February 2006). "A catalogue of eclipsing variables". Astronomy and Astrophysics.
  9. Groenewegen, M. A. T.. (2023-01-01). "Orbital parallax of binary systems compared to Gaia DR3 and the parallax zero-point offset at bright magnitudes". Astronomy and Astrophysics.
  10. (February 2003). "Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component". Astronomy and Astrophysics.
  11. (December 2002). "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components". The Astrophysical Journal Supplement Series.
  12. (October 2001). "Perturbations by Mass Loss in the Orbital Elements of γ Persei and α Centauri". Revista Mexicana de Astronomía y Astrofísica.
  13. (January 5, 2001). "GAMMA PER (Gamma Persei)". [[University of Illinois]].
  14. (February 1998). "Mass determination of astrometric binaries with Hipparcos. II. Selection of candidates and results". Astronomy and Astrophysics.
  15. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". [[Astronomy and Astrophysics]].
  16. (March 1982). "Masses and luminosities for the giant spectroscopic/speckle interferometric binaries gamma Persei and phi Cygni". Astronomical Journal.
  17. (1978). "Burnham's celestial handbook: an observer's guide to the universe beyond the solar system". [[Courier Dover Publications]].
  18. (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.
  19. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics.
  20. (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble". The Astronomical Journal.
  21. (2021). "Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3". The Astronomical Journal.

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bayer-objectsperseus-(constellation)flamsteed-objectshipparcos-objectseclipsing-binariesg-type-giantsa-type-main-sequence-starsbright-star-catalogue-objectshenry-draper-catalogue-objectsdurchmusterung-objects