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Star in the constellation Leo
Pi Leonis ,
Latinised from π Leonis , is a single
[11]
star in the
zodiac
constellation
Leo . It is a red-hued star that is visible to the naked eye with an
apparent visual magnitude of 4.70.
[2] This object is located at a distance of some 410
light-years from the
Sun based on
parallax , and is drifting further away with a
radial velocity of +22 km/s.
[4] Because the star lies near the
ecliptic it is subject to
occultations by the
Moon .
[12]
This is an
evolved ,
red giant star with a
stellar classification of M2 III.
[3] With the supply of hydrogen at its
core exhausted, it has expanded to 70 times the
Sun's radius . The star shines with 1,077 times the
luminosity of the Sun from an expanded
outer atmosphere that has an
effective temperature of 3,757
K . According to the
General Catalogue of Variable Stars , it is a suspected
variable star with a maximum magnitude of 4.67.
[13] The age of Pi Leonis is estimated at 550 million years.
[9]
References
^
a
b
c
d
e 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 .
^
a
b
c
d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data ,
SIMBAD ,
Bibcode :
1986EgUBV........0M .
^
a
b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics , 11 : 29,
Bibcode :
1973ARA&A..11...29M ,
doi :
10.1146/annurev.aa.11.090173.000333 .
^
a
b Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics , 498 (2): 627–640,
arXiv :
0901.0934 ,
Bibcode :
2009A&A...498..627F ,
doi :
10.1051/0004-6361/200810698 ,
S2CID
18739721 .
^ 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 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022), "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs", Astronomy and Astrophysics , 657 : 657,
arXiv :
2109.10912 ,
Bibcode :
2022A&A...657A...7K ,
doi :
10.1051/0004-6361/202142146 ,
S2CID
237605138 .
^
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 .
^
a
b
c Cardiel, Nicolás; Zamorano, Jaime; Bará, Salvador; Sánchez De Miguel, Alejandro; Cabello, Cristina; Gallego, Jesús; García, Lucía; González, Rafael; Izquierdo, Jaime; Pascual, Sergio; Robles, José; Sánchez, Ainhoa; Tapia, Carlos (2021), "Synthetic RGB photometry of bright stars: Definition of the standard photometric system and UCM library of spectrophotometric spectra", Monthly Notices of the Royal Astronomical Society , 504 (3): 3730,
arXiv :
2103.17009 ,
Bibcode :
2021MNRAS.504.3730C ,
doi :
10.1093/mnras/stab997 .
^
a
b Guide, Universe (2015-01-25).
"Pi Leonis Star Facts (Type, Distance, Magnitude, Colour, Luminosity, Location & more)" . Universe Guide . Retrieved 2022-05-01 .
^
"pi. Leo -- Variable Star" , SIMBAD Astronomical Database , Centre de Données astronomiques de Strasbourg, retrieved 2016-09-29 .
^ 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 .
^ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal , 94 : 751,
Bibcode :
1987AJ.....94..751W ,
doi :
10.1086/114513 .
^ Samus, N. N.; Durlevich, O. V.; et al. (2007),
Combined General Catalogue of Variable Stars (GCVS4.2) , retrieved 2016-09-30 . VizieR On-line Data Catalog:
B/gcvs .