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Single star in the constellation Pegasus
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]
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
^
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
^
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
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
^
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 & 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 .
^
"pi02 Peg" .
SIMBAD .
Centre de données 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&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&A...354..157H .
External links
Kaler, James B.
"Pi Pegasi" . Stars . University of Illinois. Retrieved 16 March 2016 .