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Sigma Pegasi

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Star in the constellation Pegasus
Sigma Pegasi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pegasus
Right ascension 22 52 24.07496
Declination +09° 50′ 08.3791″
Apparent magnitude (V) 5.16 + 13.5
Characteristics
Spectral type F6 V or F7 IV + M4 V
U−B color index −0.016
B−V color index +0.486
Astrometry
Radial velocity (Rv)+11.4 km/s
Proper motion (μ) RA: +521.04 mas/yr
Dec.: +42.65 mas/yr
Parallax (π)36.66 ± 0.29 mas
Distance89.0 ± 0.7 ly
(27.3 ± 0.2 pc)
Absolute magnitude (MV)3.01
Details
σ Peg A
Mass1.275 M☉
Surface gravity (log g)3.69 cgs
Temperature6,250 K
Metallicity −0.32 dex
Rotational velocity (v sin i)3 km/s
Age2.71±0.61 Gyr
Other designations
σ Peg, 49 Peg, BD+09° 5122, FK5 3828, HD 216385, HIP 112935, HR 8697, SAO 127810
Database references
SIMBADdata

σ Pegasi, Latinised as Sigma Pegasi, is a binary star system in the northern constellation of Pegasus. With a combined apparent visual magnitude of 5.16, it is faintly visible to the naked eye. Based upon an annual parallax shift of 36.66 mas as seen from Earth, the system is located 89 light years distant from the Sun. It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.524 arcseconds per year.

The primary, component A, is a yellow-white hued F-type main-sequence star with a stellar classification of F6 V. However, Frasca et al. (2009) lists it as a somewhat more evolved F-type subgiant star with a class of F7 IV. At the age of 2.7 billion years, it has an inactive chromosphere and is spinning with a leisurely projected rotational velocity of 3 km/s. It has a faint, magnitude 13.23 red dwarf companion, designated component B, at an angular separation of 248 arc seconds. The system is most likely (96% chance) a member of the thin disk population of the Milky Way.

References

  1. ^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  4. ^ Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  5. ^ Frasca, A.; et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911.0760, Bibcode:2009A&A...508.1313F, doi:10.1051/0004-6361/200913327, S2CID 118361131.
  6. ^ Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78, S2CID 118751608.
  7. Karatas, Y.; Schuster, W. J. (October 2006), "Metallicity and absolute magnitude calibrations for UBV photometry", Monthly Notices of the Royal Astronomical Society, 371 (4): 1793–1812, Bibcode:2006MNRAS.371.1793K, doi:10.1111/j.1365-2966.2006.10800.x.
  8. ^ Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F—K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13.
  9. ^ Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, arXiv:1301.5651, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, S2CID 56420519, L8.
  10. "49 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-10.{{cite web}}: CS1 maint: postscript (link)
  11. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  12. Lépine, Sébastien; Bongiorno, Bethany (2007), "New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems", The Astronomical Journal, 133 (3): 889–905, arXiv:astro-ph/0610605, Bibcode:2007AJ....133..889L, doi:10.1086/510333, S2CID 16800796.

External links

  • Kaler, James B. (November 6, 2015), "Sigma Pegasi", STARS, University of Illinois, retrieved 2017-08-11.
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