14 Persei

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14 Persei
Perseus constellation map.svg
Red circle.svg
Location of 14 Per (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension  02h 44m 05.15918s[1]
Declination +44° 17′ 49.3488″[1]
Apparent magnitude (V) 5.43[2]
Characteristics
Spectral type G0Ib[2]
B−V color index +0.86[3]
Astrometry
Radial velocity (Rv) −1.22±0.15[1] km/s
Proper motion (μ) RA: 2.902[1] mas/yr
Dec.: −6.682[1] mas/yr
Parallax (π) 1.7466 ± 0.0989[1] mas
Distance 1,900 ± 100 ly
(570 ± 30 pc)
Absolute magnitude (MV) −1.57[2]
Details
Mass 4.03[4] M
Radius 57.4+3.7
−6.5
[1] R
Luminosity 372[4] L
Surface gravity (log g) 1.42[2] cgs
Temperature 5,624[4] K
Metallicity [Fe/H] 0.00[2] dex
Rotational velocity (v sin i) 8.7[4] km/s
Age 162[4] Myr
Other designations
14 Per, BD+43°566, FK5 1077, HD 16901, HIP 12768, HR 800, SAO 38289[5]
Database references
SIMBAD data

14 Persei is a single[6] star in the northern constellation Perseus, located roughly 1,900 light years away from the Sun. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude is 5.43.[2] The object is slowly moving closer to the Earth with a heliocentric radial velocity of −1.2 km/s.[1]

The spectral classification of 14 Persei is as a G0 yellow supergiant, but in other respects it appears to be a giant star.[2] The class has been given as G0Ib-II Ca1 CH-1[7] or G0Ib-IIa Ca1,[8] where the abundance suffixes indicate stronger Calcium lines than expected for its class, or weaker hydrocarbons. Other analyses of the spectrum give a class of G0Ib.[2][9] Stellar models of 14 Persei yield an estimated mass four[4] times that of the Sun and an age of 162[4] million years. It has expanded to 57[1] times the Sun's radius and has a projected rotational velocity of 8.7 km/s.[4] The star is radiating 372[4] times as much luminosity compared to the Sun from its enlarged photosphere at an effective temperature of 5,624 K.[4]

14 Persei has been calculated to lie within the Cepheid instability strip although it is not considered to be variable. Uncertainty in the absolute magnitude means that the star may actually lie near the instability strip but not on it. Small periodic radial velocity variations are seen, but an order of magnitude or more smaller than for Cepheid variables and with longer periods than would be expected for pulsations. The cause of the radial velocity changes and the difference between variable and non-variable stars within the instability strip is unknown.[10]

References[edit]

  1. ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g h Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (2008). "Stellar Parameters and Elemental Abundances of Late-G Giants". Publications of the Astronomical Society of Japan. 60 (4): 781. arXiv:0805.2434. Bibcode:2008PASJ...60..781T. doi:10.1093/pasj/60.4.781.
  3. ^ Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  4. ^ a b c d e f g h i j Takeda, Yoichi; Tajitsu, Akito (2014). "Spectroscopic study on the beryllium abundances of red giant stars". Publications of the Astronomical Society of Japan. 66 (5): 91. arXiv:1406.7066. Bibcode:2014PASJ...66...91T. doi:10.1093/pasj/psu066.
  5. ^ "14 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-31.
  6. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  7. ^ Keenan, P. C.; Pitts, R. E. (1980). "Revised MK spectral types for G, K, and M stars". Astrophysical Journal Supplement Series. 42: 541. Bibcode:1980ApJS...42..541K. doi:10.1086/190662.
  8. ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  9. ^ Gray, R. O.; Graham, P. W.; Hoyt, S. R. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. II. Basic Parameters of Program Stars and the Role of Microturbulence". The Astronomical Journal. 121 (4): 2159. Bibcode:2001AJ....121.2159G. doi:10.1086/319957.
  10. ^ Butler, R. Paul (1998). "A Precision Velocity Study of Photometrically Stable Stars in the Cepheid Instability Strip". The Astrophysical Journal. 494: 342. Bibcode:1998ApJ...494..342B. CiteSeerX 10.1.1.37.7095. doi:10.1086/305195.