Astronomy:8 Persei
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Short description: Star in the constellation Perseus
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 17m 59.88750s[1] |
| Declination | +57° 53′ 59.3529″[1] |
| Apparent magnitude (V) | 5.757[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| B−V color index | 1.203[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.72[2] km/s |
| Proper motion (μ) | RA: +60.568[1] mas/yr Dec.: +5.812[1] mas/yr |
| Parallax (π) | 7.8492 ± 0.1017[1] mas |
| Distance | 416 ± 5 ly (127 ± 2 pc) |
| Absolute magnitude (MV) | 0.26[4] |
| Details | |
| Mass | 1.83[2] M☉ |
| Radius | 15.85±0.99[5] R☉ |
| Luminosity | 107.95±1.69[1] L☉ |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,560+92 −86[1] K |
| Metallicity [Fe/H] | −0.07[5] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 2.36[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
8 Persei is a single[8] star in the northern constellation of Perseus,[7] located 416 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.757.[2] There is an estimated 52% chance that the star may be a member of the Hyades–Pleiades stream of co-moving stars.[9]
With an age of over two billion years,[2] this is an aging red giant of spectral type K3 III,[3] a star that has used up its core hydrogen and is expanding. It has 1.83[2] times the mass of the Sun and has reached nearly 16[5] times the Sun's size. The star is radiating 108[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,560 K.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 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 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 3.0 3.1 Appenzeller, Immo (April 1967), "MK Spectral Types for 185 Bright Stars", Publications of the Astronomical Society of the Pacific 79 (467): 102, doi:10.1086/128449, Bibcode: 1967PASP...79..102A
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 Baines, Ellyn K. et al. (September 2016), "Spectroscopic and Interferometric Measurements of Nine K Giant Stars", The Astronomical Journal 152 (3): 8, doi:10.3847/0004-6256/152/3/66, 66, Bibcode: 2016AJ....152...66B.
- ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D.
- ↑ 7.0 7.1 "8 Per". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+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.
- ↑ Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
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