Back Gamma Persei AST Gamma Persei Spanish گاما برساووش Persian Gamma Persei French גמא בפרסאוס HE Gamma Persei ID Gamma Persei Italian ペルセウス座ガンマ星 Japanese Gamma Persei Dutch Gamma Persei Polish

Gamma Persei

γ Persei
Location of γ Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 04m 47.82011s[1]
Declination +53° 30′ 23.2626″[1]
Apparent magnitude (V) 2.93[2]
Characteristics
Spectral type G8III + A2V[3]
U−B color index +0.45[2]
B−V color index +0.70[2]
Variable type EA[4]
Astrometry
Radial velocity (Rv)+2.5[5] km/s
Proper motion (μ) RA: −14.194 mas/yr[1]
Dec.: −8.684 mas/yr[1]
Parallax (π)14.735 ± 0.188 mas[6]
Distance221 ± 3 ly
(67.9 ± 0.9 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
Mass3.6±0.2 M☉
Radius22.7±1.14 R☉
Luminosity282 L☉
Surface gravity (log g)2.23±0.08 cgs
Temperature4,970±70 K
Metallicity [Fe/H]–0.19[10] dex
Rotation5,350 days[7]
Rotational velocity (v sin i)50.0[7] km/s
γ Per B
Mass2.4±0.2 M☉
Radius3.9±0.2 R☉
Luminosity67.6 L☉
Surface gravity (log g)3.6±0.8 cgs
Temperature8,400±70 K
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
SIMBADdata

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 221 light-years (68 parsecs) 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]

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).[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 4.73 M☉ for the primary and 2.75 M☉ for the secondary, where M☉ 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: 5.036 ± 0.951 M☉ for the primary and 2.295 ± 0.453 M☉ 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 3.81 M☉ for the primary,[18] while Pizzolato and Maggio (2000) obtained 4.34 M☉.[7] Ling et al. (2001) obtained estimates of 2.7 M☉ for the primary and 1.65 M☉ for the secondary,[8] while Kaler (2001) obtained 2.5 and 1.9, respectively.[13] Diamant et al. (2023) found masses of 3.6 and 2.4 M☉ for A and B respectively.[9]

  1. ^ a b c Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference malkov was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference orbital_parallax was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference rmaa37_179 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference diamant was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference ajss74_1075 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference burnham1978 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference aaa398_1163 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference kaler was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference aaa446_2_785 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference apjss143_2_513 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference aj87_563 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference aaa330_585 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference aaa352_555 was invoked but never defined (see the help page).
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