Gamma Persei
Template:Location mark Location of γ Persei (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Perseus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 2.93[2] |
| Characteristics | |
| Spectral type | G8III + A2V[3] |
| U−B Template:Engvar | +0.45[2] |
| B−V Template:Engvar | +0.70[2] |
| Variable type | EA[4] |
| Astrometry | |
| Radial velocity (Rv) | +2.5[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 14.735±0.188 mas[6] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)[6] |
| Absolute magnitude (MV) | –1.50[7] (–1.23/0.01)[8] |
| Orbit[8] | |
| Period (P) | 14.6 yr |
| Semi-major axis (a) | 0.144″ |
| Eccentricity (e) | 0.785 |
| Inclination (i) | 90.9° |
| Longitude of the node (Ω) | 244.1° |
| Periastron epoch (T) | 1991.08 Besselian |
| Argument of periastron (ω) (secondary) | 170.0° |
| Details[9] | |
| γ Per A | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 282 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | –0.19[10] dex |
| Rotation | 5,350 days[7] |
| Rotational velocity (v sin i) | 50.0[7] km/s |
| γ Per B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 67.6 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 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. | |
| Database references | |
| SIMBAD | data |
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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,[2] making it the fourth-brightest member of the constellation. The distance to this system is of roughly Script error: No such module "convert". with a 1% margin of error.[6] About 4° to the north of Gamma Persei is the radiance point for the annual Perseid meteor shower.[11]
This is a wide eclipsing binary system with an orbital period of 5,329.8 days (14.6 years).[12] This eclipse was first observed in 1990 and lasted for two weeks.[13] During an eclipse, the primary passes in front of the secondary, causing the magnitude of the system to decrease by 0.55.[14] The primary component of this system is a giant star with a stellar classification of G9 III.[15] It has a projected rotational velocity of 50.0 km s−1 and a lengthy estimated rotation period of 14.6 years.[7] The classification of the secondary remains tentative, with assignments of A3 V[8] and A2(III).[15]
Mass estimates for the two stars remain disparate. Using speckle interferometry, McAlister (1982) obtained mass estimates of Template:Solar mass for the primary and Template:Solar mass for the secondary, where Template:Solar mass is the mass of the Sun. He noted that the mass estimate was too high for the given classification of the primary.[16] Martin and Mignard (1998) determined masses for both components based on data from the Hipparcos mission: Template:Solar mass for the primary and Template:Solar mass for the secondary. They admit that the high inclination of the orbit resulted in a large margin of error.[17] Prieto and Lambert (1999) came up with a mass estimate of Template:Solar mass for the primary,[18] while Pizzolato and Maggio (2000) obtained Template:Solar mass.[7] Ling et al. (2001) obtained estimates of Template:Solar mass for the primary and Template:Solar mass for the secondary,[8] while Kaler (2001) obtained 2.5 and 1.9, respectively.[13] Diamant et al. (2023) found masses of Template:Solar mass for A and B respectively.[9]
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.[19]
- In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), 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 Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[20]
References
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- ↑ a b c Template:Cite DR3
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- ↑ a b c Template:Ciation Gamma Persei's database entry at VizieR.
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
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- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日 Script error: No such module "webarchive".
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