32 Pegasi

32 Pegasi
Location of 32 Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 22h 21m 19.33896s[1]
Declination 28° 19′ 49.8786″[1]
Apparent magnitude (V) 4.81[2] (4.83 + 8.86)[3]
Characteristics
Spectral type B9III[4]
U−B color index −0.19[2]
B−V color index +0.00[2]
Astrometry
Radial velocity (Rv)+11.40[5] km/s
Proper motion (μ) RA: +17.426[1] mas/yr
Dec.: +7.122[1] mas/yr
Parallax (π)5.7814 ± 0.3196 mas[1]
Distance560 ± 30 ly
(173 ± 10 pc)
Absolute magnitude (MV)−1.82[6]
Details
32 Peg Aa
Luminosity541[6] L☉
Temperature11,403[7] K
Rotational velocity (v sin i)60[8] km/s
Other designations
32 Peg, BD+27°4299, GC 31253, HD 212097, HIP 110371, HR 8522, SAO 90440, CCDM J22213+2820AF, WDS J22213+2820Aa,Ab[9]
Database references
SIMBADdata

32 Pegasi is a binary star[10] system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.81[2] The system is located approximately 560 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +11.4 km/s.[5]

The brighter member of this system, designated component Aa, has visual magnitude 4.83 with a stellar classification of B9III,[4] matching a late B-type star with the luminosity class of a giant. It is spinning with a projected rotational velocity of 60 km/s,[8] and is radiating 541[6] times the luminosity of the Sun from its photosphere at an effective temperature of 11,403 K.[7]

The fainter secondary, component Ab, is of magnitude 8.86 with an angular separation of 0.50″ along a position angle of 288° from the primary, as of 2005. Visual companions include component B, at a 70.7″ separation from the primary and magnitude 10.73; C, at a separation from B of 3.2″ and magnitude 12.4; as well as D (separation from A of 42.8″ and magnitude 11.9) and E (separation from A of 58.3" and magnitude 11.9).[3]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (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
  4. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  5. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  7. ^ a b Paunzen, E.; Schnell, A.; Maitzen, H. M. (2005). "An empirical temperature calibration for the Δa photometric system". Astronomy and Astrophysics. 444 (3): 941. arXiv:astro-ph/0509049. Bibcode:2005A&A...444..941P. doi:10.1051/0004-6361:20053546. S2CID 119436374.
  8. ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  9. ^ "32 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-01.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976. Vizier catalog entry

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