Astronomy:33 Pegasi

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Short description: Star in the constellation Pegasus
33 Pegasi
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pegasus
Right ascension  22h 23m 39.565s[1]
Declination 20° 50′ 53.84″[1]
Apparent magnitude (V) 6.203[2] (6.391 + 9.287)[3]
Characteristics
Spectral type F7 V[4]
B−V color index 0.518±0.004[5]
Astrometry
Radial velocity (Rv)23.8±0.4[2] km/s
Proper motion (μ) RA: +333.057[1] mas/yr
Dec.: −10.827[1] mas/yr
Parallax (π)29.8125 ± 0.0436[1] mas
Distance109.4 ± 0.2 ly
(33.54 ± 0.05 pc)
Absolute magnitude (MV)3.55[2]
Details
33 Peg A
Mass1.28[6] M☉
Radius1.29+0.15
−0.14[7] R☉
Luminosity2.850+0.007
−0.008[7] L☉
Surface gravity (log g)4.29[8] cgs
Temperature6,169[9] K
Metallicity [Fe/H]–0.18[9] dex
Rotational velocity (v sin i)6[2] km/s
Age4.1[9] Gyr
33 Peg B
Mass0.80[6] M☉
Other designations
33 Peg, BD–16 4196, HD 212395, HIP 110548, HR 8532, SAO 90462[10]
Database references
SIMBADdata

33 Pegasi is the Flamsteed designation for a visual binary star in the northern constellation of Pegasus. It has an apparent visual magnitude of 6.2,[2] placing it near the limit of naked eye visibility. Measurements show an annual parallax shift of 0.0298125″,[1] which is equivalent to a distance of 109 ly (33 pc) from the Sun. It is drifting further away with a radial velocity of 24 km/s.[2]

The primary component of this system is a main sequence star with a visual magnitude of 6.4[3] and a stellar classification of F7 V.[4] It is nearly as old as the Sun with an estimated age of 4.1 billion years, but has a lower abundance of elements other than hydrogen and helium. The star has 1.3 times the mass[6] and radius[7] of the Sun. The stellar atmosphere has an effective temperature of 6,169 K,[9] giving it the yellow-white glow of an F-type star.[11]

A faint, magnitude 9.3 companion star is located at an angular separation of 0.420 arc seconds along a position angle of 0.0°.[3] The pair have a projected separation of 15.6 astronomical unit|AU[6] with an orbital period of about 250 years.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, doi:10.1051/0004-6361:20035959, Bibcode: 2004A&A...418..989N. 
  3. ↑ 3.0 3.1 3.2 Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode: 2000A&A...356..141F. 
  4. ↑ 4.0 4.1 Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal 75 (2): 165–166, doi:10.1086/110956, Bibcode: 1970AJ.....75..165H. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 6.2 6.3 Tokovinin, A.; Kiyaeva, O. (2015), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society 456 (2): 2070, doi:10.1093/mnras/stv2825, Bibcode: 2016MNRAS.456.2070T. 
  7. ↑ 7.0 7.1 7.2 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. ↑ Boesgaard, Ann Merchant et al. (2004), "The Correlation of Lithium and Beryllium in F and G Field and Cluster Dwarf Stars", The Astrophysical Journal 613 (2): 1202–1212, doi:10.1086/423194, Bibcode: 2004ApJ...613.1202B. 
  9. ↑ 9.0 9.1 9.2 9.3 Casagrande, L. et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics 530: A138, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C. 
  10. ↑ "* 33 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+33+Peg. 
  11. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16. 
  12. ↑ 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. 

Coordinates: Sky map 22h 23m 39.564s, +20° 50′ 53.62″



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