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Pi2 Pegasi

August 26, 2023

For other stars with this Bayer designation see π Pegasi

π2 Pegasi, Latinized as Pi2 Pegasi, is a single[8] star in the northern constellation Pegasus. It is yellow-white in hue and visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.28.[2] The distance to this object is approximately 263 light years based on parallax,[1] and it is drifting further away with a radial velocity of +5 km/s.[2] This star is an outlying member of the Ursa Major Moving Group.[9]

π2 Pegasi
Location of π2 Pegasi (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 09m 59.24371s[1]
Declination +33° 10′ 41.5976″ [1]
Apparent magnitude (V) +4.28[2]
Characteristics
Spectral type F5 III[3]
B−V color index 0.471±0.012[2]
Astrometry
Radial velocity (Rv)+5.1±0.9[2] km/s
Proper motion (μ) RA: −12.87±0.12[1] mas/yr
Dec.: −18.95±0.16[1] mas/yr
Parallax (π)12.40 ± 0.17 mas[1]
Distance263 ± 4 ly
(81 ± 1 pc)
Absolute magnitude (MV)0.21[4]
Details
Mass2.48[5] M☉
Radius8.5±0.8[6] R☉
Luminosity102.9±2.6[6] L☉
Temperature6,300+298
−263[6] K
Rotational velocity (v sin i)139.7[4] km/s
Age530[5] Myr
Other designations
π2 Peg, 29 Pegasi, BD+32°4352, FK5 835, HD 210459, HIP 109410, HR 8454, SAO 72077[7]
Database references
SIMBADdata
π1 Pegasi (right) and π2 Pegasi (left) in optical light

This object has a stellar classification of F5 III,[3] matching an aging giant star that has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. At present it has 8.5[6] times the radius of the Sun. The star is 530[5] million years old with 2.48[5] times the Sun's mass. It shows a high rotation rate considering its evolutionary status, with a projected rotational velocity of 140 km/s.[4] The star has been noted as a possible variable shell star.[10] Pi2 Pegasi is radiating 103 times the Sun's luminosity from its swollen photosphere at an effective temperature of 6,300 K.[6]

References Edit

  1. ^ a b c d e f van Leeuwen, F. (November 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. ^ a b c d e 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.
  3. ^ a b Herbig, George H.; Spalding, John F., Jr. (January 1955), "Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5", Astrophysical Journal, 121: 118, Bibcode:1955ApJ...121..118H, doi:10.1086/145969.{{citation}}: CS1 maint: multiple names: authors list (link)
  4. ^ a b c Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
  5. ^ a b c d Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
  6. ^ 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.
  7. ^ "pi02 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-11.
  8. ^ 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.
  9. ^ Chupina, N. V.; et al. (June 2006), "Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars", Astronomy and Astrophysics, 451 (3): 909–916, Bibcode:2006A&A...451..909C, doi:10.1051/0004-6361:20054009.
  10. ^ Hauck, B.; Jaschek, C. (February 2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics, 354: 157–162, Bibcode:2000A&A...354..157H.

External links Edit

  • Kaler, James B. "Pi Pegasi". Stars. University of Illinois. Retrieved 16 March 2016.

August 26, 2023
pegasi, other, stars, with, this, bayer, designation, pegasi, pegasi, latinized, single, star, northern, constellation, pegasus, yellow, white, visible, naked, faint, point, light, with, apparent, visual, magnitude, distance, this, object, approximately, light. For other stars with this Bayer designation see p Pegasi p2 Pegasi Latinized as Pi2 Pegasi is a single 8 star in the northern constellation Pegasus It is yellow white in hue and visible to the naked eye as a faint point of light with an apparent visual magnitude of 4 28 2 The distance to this object is approximately 263 light years based on parallax 1 and it is drifting further away with a radial velocity of 5 km s 2 This star is an outlying member of the Ursa Major Moving Group 9 p2 PegasiLocation of p2 Pegasi circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation PegasusRight ascension 22h 09m 59 24371s 1 Declination 33 10 41 5976 1 Apparent magnitude V 4 28 2 CharacteristicsSpectral type F5 III 3 B V color index 0 471 0 012 2 AstrometryRadial velocity Rv 5 1 0 9 2 km sProper motion m RA 12 87 0 12 1 mas yr Dec 18 95 0 16 1 mas yrParallax p 12 40 0 17 mas 1 Distance263 4 ly 81 1 pc Absolute magnitude MV 0 21 4 DetailsMass2 48 5 M Radius8 5 0 8 6 R Luminosity102 9 2 6 6 L Temperature6 300 298 263 6 KRotational velocity v sin i 139 7 4 km sAge530 5 MyrOther designationsp2 Peg 29 Pegasi BD 32 4352 FK5 835 HD 210459 HIP 109410 HR 8454 SAO 72077 7 Database referencesSIMBADdata p1 Pegasi right and p2 Pegasi left in optical lightThis object has a stellar classification of F5 III 3 matching an aging giant star that has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence At present it has 8 5 6 times the radius of the Sun The star is 530 5 million years old with 2 48 5 times the Sun s mass It shows a high rotation rate considering its evolutionary status with a projected rotational velocity of 140 km s 4 The star has been noted as a possible variable shell star 10 Pi2 Pegasi is radiating 103 times the Sun s luminosity from its swollen photosphere at an effective temperature of 6 300 K 6 References Edit a b c d e f van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d e 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 a b Herbig George H Spalding John F Jr January 1955 Axial Rotation and Line Broadening in Stars of Spectral Types F0 K5 Astrophysical Journal 121 118 Bibcode 1955ApJ 121 118H doi 10 1086 145969 a href Template Citation html title Template Citation citation a CS1 maint multiple names authors list link a b c Reiners Ansgar January 2006 Rotation and temperature dependence of stellar latitudinal differential rotation Astronomy and Astrophysics 446 1 267 277 arXiv astro ph 0509399 Bibcode 2006A amp A 446 267R doi 10 1051 0004 6361 20053911 S2CID 8642707 a b c d Luck R Earle September 2015 Abundances in the Local Region I G and K Giants The Astronomical Journal 150 3 23 arXiv 1507 01466 Bibcode 2015AJ 150 88L doi 10 1088 0004 6256 150 3 88 S2CID 118505114 88 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 amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR pi02 Peg SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 10 11 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 Chupina N V et al June 2006 Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars Astronomy and Astrophysics 451 3 909 916 Bibcode 2006A amp A 451 909C doi 10 1051 0004 6361 20054009 Hauck B Jaschek C February 2000 A shell stars in the Geneva system Astronomy and Astrophysics 354 157 162 Bibcode 2000A amp A 354 157H External links EditKaler James B Pi Pegasi Stars University of Illinois Retrieved 16 March 2016 Retrieved from https en wikipedia org w index php title Pi2 Pegasi amp oldid 1149598528, wikipedia, wiki, book, books, library,

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