Psi Pegasi

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Psi Pegasi
Pegasus constellation map.svg
Red circle.svg
Location of ψ Pegasi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Pegasus
Right ascension 23h 57m 45.52681s [1]
Declination 25° 08′ 29.0480″ [1]
Apparent magnitude  (V)4.66 [2]
Characteristics
Spectral type M3III [3]
U−B color index +1.66 [2]
B−V color index +1.59 [2]
Variable type suspected [4]
Astrometry
Radial velocity (Rv)−6.59±0.23 [5]  km/s
Proper motion (μ)RA: −35.24 [1]   mas/yr
Dec.: −31.60 [1]   mas/yr
Parallax (π)6.85 ± 0.24  mas [1]
Distance 480 ± 20  ly
(146 ± 5  pc)
Absolute magnitude  (MV)–1.19 [6]
Orbit [7]
Period (P)55.06±11.31 yr
Semi-major axis (a)0.170±0.016″
Eccentricity (e)0.19±0.10
Inclination (i)65.6±2.2°
Longitude of the node (Ω)46.6±2.3°
Periastron epoch (T)2,001.83±8.81
Argument of periastron (ω)
(secondary)		159.7±11.9°
Details
Radius 98±6 [8]   R☉
Luminosity 960 [6]   L☉
Temperature 3,882 [9]   K
Other designations
ψ Peg, 84 Pegasi, NSV  14777, BD+24°4865, FK5  1629, GC  33230, HD  224427, HIP  118131, HR  9064, SAO  91611, WDS J23578+2508AB [10]
Database references
SIMBAD data

Psi Pegasi, which is Latinized from ψ Pegasi, is a binary star system within the great square [11] in the northern constellation of Pegasus. It has a red hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.66. [2] This object is located at a distance of approximately 476  light-years away from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −6.6 km/s. [5]

A visual band light curve for Psi Pegasi, plotted from data published by Tabur et al. (2009) PsiPegLightCurve.png
A visual band light curve for Psi Pegasi, plotted from data published by Tabur et al. (2009)

The orbital elements for this system were computed for the first time in 2004 based on interferometric observations, yielding an orbital period of roughly 55 years and an eccentricity of about 0.19. [7] [13] [14] The visible component is an aging red giant star on the asymptotic giant branch [15] with a stellar classification of M3III. [3] It is a suspected variable, probably semiregular, with its magnitude varying from 4.63 to 4.69 [4] [16] over periods of 37.4 and 118.9 days. [12] With the supply of hydrogen exhausted at its core, the star has cooled and expanded to around 98 [8] times the Sun's radius. It is radiating 960 [6] times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,882  K . [9]

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<span class="mw-page-title-main">31 Pegasi</span> Star in the constellation Pegasus

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<span class="mw-page-title-main">W Cygni</span> Semi-regular variable star in the constellation Cygnus

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References

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  9. 1 2 Martínez, M. Isabel Pérez; et al. (2011). "The basal chromospheric Mg ii h+k flux of evolved stars: Probing the energy dissipation of giant chromospheres". Monthly Notices of the Royal Astronomical Society. 414 (1): 418. arXiv: 1102.4832 . Bibcode:2011MNRAS.414..418P. doi: 10.1111/j.1365-2966.2011.18421.x . S2CID   59268230. Vizier catalog entry
  10. ↑ "psi Peg". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-10-26.
  11. ↑ Harrington, Philip S. (2010). Cosmic Challenge: The Ultimate Observing List for Amateurs. Cambridge University Press. p. 50. ISBN   9781139493680.
  12. 1 2 Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (December 2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society . 400 (4): 1945–1961. arXiv: 0908.3228 . Bibcode:2009MNRAS.400.1945T. doi: 10.1111/j.1365-2966.2009.15588.x . S2CID   15358380.
  13. ↑ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi: 10.1051/0004-6361/201219774 . Vizier catalog entry
  14. ↑ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . Vizier catalog entry
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  16. ↑ Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W.
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