From Wikipedia, the free encyclopedia
Single, variable M-type giant star in the constellation Leo
The
bright giant star 72 Leonis
72 Leonis is a single
[9]
variable star in the
zodiac
constellation of
Leo , located roughly 1,000
light years away from the Sun.
[1] It has the
variable star designation FN Leonis ; 72 Leonis is the
Flamsteed designation . In
Chinese astronomy , 72 Leonis is called 虎賁,
Pinyin : Hǔbēn, meaning Emperor’s Bodyguard , because this star is marking itself and stands alone in the Emperor’s Bodyguard
asterism ,
Supreme Palace enclosure mansion (see :
Chinese constellation ).
[10]
This object is visible to the naked eye as a red-hued star with an
apparent visual magnitude of 4.56.
[4] It is an
evolved
bright giant with a
stellar classification of M3 IIb and was listed as a spectral standard star for that class.
[3] The star is classified as an
irregular variable of type LC, ranging from
Hipparcos magnitude 4.56 down to 4.64.
[5] It has a radius 162 to 179
[11] times that of the Sun and radiates 5,407
[12] times the
Sun's luminosity at an
effective temperature of around 3,734 K.
[13] The star is moving away from the Earth with a heliocentric
radial velocity of 15 km/s.
[4]
A
light curve for FN Leonis, plotted from
Hipparcos data
[14]
References
^
a
b
c
d
e
f 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 .
^ 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 .
^
a
b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 : 245,
Bibcode :
1989ApJS...71..245K ,
doi :
10.1086/191373 .
^
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 Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports , 5.1, 61 (1): 80–88,
Bibcode :
2017ARep...61...80S ,
doi :
10.1134/S1063772917010085 ,
S2CID
125853869 .
^
a
b
c
d
e
f Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Van Belle, Gerard T. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal , 155 (1): 30,
arXiv :
1712.08109 ,
Bibcode :
2018AJ....155...30B ,
doi :
10.3847/1538-3881/aa9d8b ,
S2CID
119427037 .
^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society , 471 (1): 770,
arXiv :
1706.02208 ,
Bibcode :
2017MNRAS.471..770M ,
doi :
10.1093/mnras/stx1433 ,
S2CID
73594365 .
^
"72 Leo" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-02-09 .
^ 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 .
^
Leo the Lion , Ian Ridpath's Startales, retrieved 2019-02-10 .
^ Kaler, James B. (May 11, 2012),
"72 Leonis" , stars.astro.illinois.edu , retrieved 2017-10-09 .
^ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^ Dyck, H. M.; et al. (1998), "Radii and Effective Temperatures for K and M Giants and Supergiants. II", The Astronomical Journal , 116 (2): 981,
Bibcode :
1998AJ....116..981D ,
CiteSeerX
10.1.1.24.1889 ,
doi :
10.1086/300453 ,
S2CID
16674990 .
^
"Hipparcos Tools Interactive Data Access" . Hipparcos . ESA. Retrieved 8 December 2021 .