Astronomy:14 Persei
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | |
| Database references | |
| SIMBAD | data |
14 Persei is a single star[6] 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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. doi:10.1093/pasj/60.4.781. Bibcode: 2008PASJ...60..781T.
- ↑ Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 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. doi:10.1093/pasj/psu066. Bibcode: 2014PASJ...66...91T.
- ↑ "14 Per". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=14+Per.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Keenan, P. C.; Pitts, R. E. (1980). "Revised MK spectral types for G, K, and M stars". Astrophysical Journal Supplement Series 42: 541. doi:10.1086/190662. Bibcode: 1980ApJS...42..541K.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 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. doi:10.1086/319957. Bibcode: 2001AJ....121.2159G.
- ↑ Butler, R. Paul (1998). "A Precision Velocity Study of Photometrically Stable Stars in the Cepheid Instability Strip". The Astrophysical Journal 494 (1): 342–365. doi:10.1086/305195. Bibcode: 1998ApJ...494..342B.
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