Astronomy:Psi Capricorni
Observation data Equinox J2000.0]] (ICRS) | |
---|---|
Constellation | Capricornus |
Right ascension | 20h 46m 05.73263s[1] |
Declination | −25° 16′ 15.2312″[1] |
Apparent magnitude (V) | 4.13[2] |
Characteristics | |
Spectral type | F5 V[3] |
U−B color index | −0.03[2] |
B−V color index | +0.42[2] |
Astrometry | |
Radial velocity (Rv) | +20.3[4] km/s |
Proper motion (μ) | RA: −51.96[1] mas/yr Dec.: −156.56[1] mas/yr |
Parallax (π) | 68.13 ± 0.27[1] mas |
Distance | 47.9 ± 0.2 ly (14.68 ± 0.06 pc) |
Absolute magnitude (MV) | 3.33[5] |
Details | |
Mass | 1.37[6] M☉ |
Radius | 1.51+0.08 −0.04[7] R☉ |
Luminosity | 3.82±0.03[7] L☉ |
Surface gravity (log g) | 4.25[6] cgs |
Temperature | 6,572+89 −173[7] K |
Metallicity [Fe/H] | 0.15[6] dex |
Rotational velocity (v sin i) | 40.9±2.0[8] km/s |
Age | 1.4[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Psi Capricorni, Latinized from ψ Capricorni, is a single[10] star in the southern zodiac constellation of Capricornus. It is a yellow-white hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.13.[2] The distance to this star is approximately 47.9 light years based on parallax measurements,[1] and it is drifting further away with a radial velocity of +20 km/s.[4] The closest approach to the Sun occurred some 467,000 years ago at a separation of 20 light-years.[11]
This object is an F-type main-sequence star with a stellar classification of F5 V/[3] It is 1.4[3] billion years old with 1.4[6] times the mass of the Sun. The measured rotational velocity of this star is approximately 41 km/s[8] (the Sun has an equatorial rotation velocity of 2 km/s). Analysis of the line profile of the star's spectrum indicates that it is undergoing differential rotation, with the variation by latitude being similar to the Sun.[12] The star has 1.5[7] times the Sun's radius and is radiating 3.8[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,572 K.[7] It displays an infrared excess, suggesting the presence of an orbiting debris disk at a separation of 38.75 astronomical unit|AU and a temperature of 60 K.[13]
Chinese name
In Chinese, 天田 (Tiān Tián), meaning Celestial Farmland, refers to an asterism consisting of ψ Capricorni, ω Capricorni, 3 Piscis Austrini, and 24 Capricorni.[14] Consequently, the Chinese name for ω Capricorni itself is 天田四 (Tiān Tián sì, English: the Fourth Star of Celestial Farmland).[15]
In R. H. Allen's version, this star represented the battle-axe Yue.[16]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 3.3 Ehrenreich, D. et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics 523: A73, doi:10.1051/0004-6361/201014763, Bibcode: 2010A&A...523A..73E.
- ↑ 4.0 4.1 Nordström, B. et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia 21 (2): 129–133, doi:10.1071/AS04013, Bibcode: 2004PASA...21..129N.
- ↑ Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics 446 (1): 267–277, doi:10.1051/0004-6361:20053911, Bibcode: 2006A&A...446..267R
- ↑ 6.0 6.1 6.2 6.3 Luck, R. Earle (March 2018), "Abundances in the Local Region. III. Southern F, G, and K Dwarfs", The Astronomical Journal 155 (3): 31, doi:10.3847/1538-3881/aaa9b5, 111, Bibcode: 2018AJ....155..111L.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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.
- ↑ 8.0 8.1 Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics 542: A116, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ "psi Cap". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi+Cap.
- ↑ 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.
- ↑ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics 575: 13, doi:10.1051/0004-6361/201425221, A35, Bibcode: 2015A&A...575A..35B.
- ↑ Reiners, Ansgar; Schmitt, Jürgen H. M. M.; Kürster, Martin (September 2001), "Detection of differential rotation in psi Cap with profile analysis", Astronomy and Astrophysics 376: L13–L16, doi:10.1051/0004-6361:20011023, Bibcode: 2001A&A...376L..13R.
- ↑ Gáspár, András et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal 826 (2): 171, doi:10.3847/0004-637X/826/2/171, Bibcode: 2016ApJ...826..171G.
- ↑ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN:978-986-7332-25-7.
- ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
- ↑ Allen, R. H. (1963), Star Names, Dover, p. 142, https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Capricornus*.html
External links
- Kaler, James (September 25, 2009), "Psi Capricorni", STARS, http://stars.astro.illinois.edu/sow/psicap.html, retrieved 2019-10-25.
- "4C01688". ARICNS. 1998-03-04. http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c01688.htm. Retrieved 2006-08-16.
Original source: https://en.wikipedia.org/wiki/Psi Capricorni.
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