Astronomy:Xi Pegasi
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Short description: Double star in the constellation Pegasus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 46m 41.58118s[1] |
| Declination | +12° 10′ 22.3854″[1] |
| Apparent magnitude (V) | 4.195[2] + 11.70[3] |
| Characteristics | |
| Spectral type | F6V[4] + M3.5[5] |
| U−B color index | −0.015[2] |
| B−V color index | +0.502[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.3[6] km/s |
| Proper motion (μ) | RA: +234.18[1] mas/yr Dec.: −493.29[1] mas/yr |
| Parallax (π) | 61.36 ± 0.19[1] mas |
| Distance | 53.2 ± 0.2 ly (16.30 ± 0.05 pc) |
| Absolute magnitude (MV) | 3.25[7] |
| Details | |
| Xi Peg A | |
| Mass | 1.17[8] M☉ |
| Radius | 1.86[8] R☉ |
| Luminosity | 4.5[8] L☉ |
| Surface gravity (log g) | 3.97±0.07[8] cgs |
| Temperature | 6,178±26[8] K |
| Metallicity [Fe/H] | −0.27±0.03[8] dex |
| Rotational velocity (v sin i) | 12.67[9] km/s |
| Age | 5.0±0.5[8] Gyr |
| Xi Peg B | |
| Mass | 0.32[10] M☉ |
| Temperature | 3,569[3] K |
| Metallicity [Fe/H] | −0.25[3] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Pegasi (ξ Peg, ξ Pegasi) is the Bayer designation for a double star in the northern constellation of Pegasus, the winged horse. Located in the horse's neck, the primary component is an F-type main sequence star that is visible to the naked eye with an apparent visual magnitude of 4.2.[2] It is 86% larger and 17% more massive that the Sun, radiating 4.5 times the solar luminosity.[8] Based upon parallax measurements taken with the Hipparcos spacecraft, it is located 53.2 ± 0.2 light years from the Sun.[1]
The primary has been examined for the presence of an infrared excess that might indicate the presence of a debris disk, but none has been discovered.[12] The common proper motion companion, NLTT 54820, is a twelfth magnitude red dwarf located at an angular separation of 11.4″ along a position angle of 96.9°.[13] This corresponds to a projected physical separation of 192.3 AU.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (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 Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series 61: 387–405, Bibcode: 1985A&AS...61..387K.
- ↑ 3.0 3.1 3.2 Rojas-Ayala, Bárbara et al. (April 2012), "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs", The Astrophysical Journal 748 (2): 93, doi:10.1088/0004-637X/748/2/93, Bibcode: 2012ApJ...748...93R.
- ↑ Gray, R. O.; Graham, P. W.; Hoyt, S. R. (April 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): 2159–2172, doi:10.1086/319957, Bibcode: 2001AJ....121.2159G.
- ↑ Bidelman, W. P. (October 1985), "G. P. Kuiper's spectral classifications of proper-motion stars", Astrophysical Journal Supplement Series 59: 197–227, doi:10.1086/191069, Bibcode: 1985ApJS...59..197B.
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington D.C.), Bibcode: 1953GCRV..C......0W.
- ↑ Huang, W. et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics 547: A62, doi:10.1051/0004-6361/201219804, Bibcode: 2012A&A...547A..62H.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Ghezzi, L. et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal 720 (2): 1290–1302, doi:10.1088/0004-637X/720/2/1290, Bibcode: 2010ApJ...720.1290G.
- ↑ Martínez-Arnáiz, R. et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter", Astronomy and Astrophysics 520: A79, doi:10.1051/0004-6361/200913725, Bibcode: 2010A&A...520A..79M, http://eprints.ucm.es/37826/1/davidmontes17libre.pdf, retrieved 2018-11-04.
- ↑ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 14, doi:10.1088/0004-6256/147/4/87, 87, Bibcode: 2014AJ....147...87T.
- ↑ "ksi Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi+Peg.
- ↑ 12.0 12.1 Moro-Martín, A. et al. (March 2015), "Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys", The Astrophysical Journal 801 (2): 28, doi:10.1088/0004-637X/801/2/143, 143, Bibcode: 2015ApJ...801..143M.
- ↑ Gould, Andrew; Chanamé, Julio (February 2004), "New Hipparcos-based Parallaxes for 424 Faint Stars", The Astrophysical Journal Supplement Series 150 (2): 455–464, doi:10.1086/381147, Bibcode: 2004ApJS..150..455G.
External links
- Kaler, James B., "Xi Pegasi", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/xipeg.html, retrieved 2016-01-07.
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