gamma Persei
{{Short description|Binary star system in the constellation Perseus}}
{{Starbox begin
| name = γ Persei
}}
{{Starbox image
| image=
{{Location mark
|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)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Perseus
| dec = {{DEC|+53|30|23.2626}}
}}
{{Starbox character
| variable = EA
}}
{{Starbox astrometry
| prop_mo_ra = {{val|-14.194}}
| prop_mo_dec = {{val|-8.684}}
| pm_footnote = {{cite DR3|447071293401293056}}
| parallax = 14.735
| p_error = 0.188
| absmag_v = –1.50 (–1.23/0.01)
}}
{{Starbox orbit
| period = 14.6
| axis = 0.144
| eccentricity = 0.785
| inclination = 90.9
| node = 244.1
| periastron = 1991.08 Besselian
| periarg = 170.0
}}
{{Starbox detail
| component1 = γ Per A
| mass = {{val|3.6|0.2}}
| radius = {{val|22.7|1.14}}
| gravity = {{val|2.23|0.08}}
| age_myr =
| luminosity = 282
| temperature = {{val|4970|70|fmt=commas}}
| component2 = γ Per B
| mass2 = {{val|2.4|0.2}}
| radius2 = {{val|3.9|0.2}}
| temperature2 = {{val|8400|70|fmt=commas}}
| gravity2 = {{val|3.6|0.08}}
| luminosity2 = 67.6
}}
{{Starbox catalog
| 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.
}}
{{Starbox reference
|Simbad=Gamma+Persei
}}
{{Starbox end}}
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 {{Convert|221|ly|pc|abbr=off|lk=on}} with a 1% margin of error. About 4° to the north of Gamma Persei is the radiance point for the annual Perseid meteor shower.
File:Gamma Persei TESS lightcurve.png (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 {{Solar mass|4.73}} for the primary and {{Solar mass|2.75}} for the secondary, where {{Solar mass}} 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: {{Solar mass|5.036 ± 0.951}} for the primary and {{Solar mass|2.295 ± 0.453}} 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 {{Solar mass|3.81}} for the primary, while Pizzolato and Maggio (2000) obtained {{Solar mass|4.34}}. Ling et al. (2001) obtained estimates of {{Solar mass|2.7}} for the primary and {{Solar mass|1.65}} for the secondary, while Kaler (2001) obtained 2.5 and 1.9, respectively. Diamant et al. (2023) found masses of {{solar mass|3.6 and 2.4}} 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=[https://archive.org/details/starnamestheirlo00alle/page/331 331]
| url-access=registration
}}
- In Chinese, {{lang|zh|天船}} ({{lang|zh-Latn|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 {{lang|zh|天船二}} ({{lang|zh-Latn|Tiān Chuán èr}}, {{langx|en|the Second Star of Celestial Boat}}.){{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|url=https://web.archive.org/web/20120204114123/http://aeea.nmns.edu.tw/2006/0607/ap060711.html |date=2012-02-04 }}
References
{{reflist|30em|refs=
{{citation | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Washington | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W }}
{{Ciation |last=Groenewegen |first=M. A. T. |date=2023-01-01 |title=Orbital parallax of binary systems compared to Gaia DR3 and the parallax zero-point offset at bright magnitudes |bibcode=2023A&A...669A...4G |arxiv=2210.14734 |journal=Astronomy and Astrophysics |volume=669 |pages=A4 |doi=10.1051/0004-6361/202244479 |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/669/A4&Name=03048%2B5330 Gamma Persei's database entry] at VizieR.
{{citation | first1=James B. | last1=Kaler | title=GAMMA PER (Gamma Persei) | date=January 5, 2001 | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/gammaper.html | access-date=2012-02-25 }}
{{citation | last1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L. | title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures | journal=Astronomy and Astrophysics | volume=352| pages=555–562 | date=1999 | doi=10.1051/0004-6361/200811242 | bibcode=1999A&A...352..555A | arxiv=0809.0359 | s2cid=14531031 }}
{{citation | first1=Robert | last1=Burnham | title=Burnham's celestial handbook: an observer's guide to the universe beyond the solar system | volume=3 | series=Dover books explaining science | edition=2nd | publisher=Courier Dover Publications | date=1978 | isbn=0486236730 | page=420 | url=https://books.google.com/books?id=PJzIt3SIlkUC&pg=PA1420 }}
}}
{{Stars of Perseus}}
{{DEFAULTSORT:Gamma Persei}}
Category:Perseus (constellation)