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72 Leonis

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72 Leonis
Location of 72 Leonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo[1]
Right ascension 11h 15m 12.22839s[2]
Declination +23° 05′ 43.8322″[2]
Apparent magnitude (V) 4.63[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M3 IIb[5]
B−V color index 1.657±0.003[1]
Variable type LC[6]
Astrometry
Radial velocity (Rv)14.76±0.21[1] km/s
Proper motion (μ) RA: −25.612 mas/yr[2]
Dec.: −5.995 mas/yr[2]
Parallax (π)4.2936±0.2815 mas[2]
Distance760 ± 50 ly
(230 ± 20 pc)
Absolute magnitude (MV)−2.69[1]
Details
Mass3.11[7] M☉
Radius149+9
−10[8] R☉
Luminosity5,770[9] L☉
Surface gravity (log g)1.16[7] cgs
Temperature3,613±48[7] K
Metallicity [Fe/H]−0.03[7] dex
Age400[7] Myr
Other designations
72 Leo, FN Leo, AAVSO 1109+23, BD+23°2322, FK5 2897, HD 97778, HIP 54951, HR 4362, SAO 81736[10]
Database references
SIMBADdata
The bright giant star 72 Leonis

72 Leonis is a single[11] variable star in the zodiac constellation of Leo, located roughly 760 light years away.[2] 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).[12]

This object is visible to the naked eye as a red-hued star with an apparent visual magnitude of 4.56.[1] It is an evolved bright giant with a stellar classification of M3 IIb and was listed as a spectral standard star for that class.[5] The star is classified as an irregular variable of type LC, ranging from Hipparcos magnitude 4.56 down to 4.64.[6] It has a radius 150 times that of the Sun[8] and radiates 5,770 times the Sun's luminosity[9] at an effective temperature of around 3,613 K.[7] The star is moving away from the Earth with a heliocentric radial velocity of 15 km/s.[1]

A light curve for FN Leonis, plotted from Hipparcos data [13]

References

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  1. ^ a b c d e f 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. XHIP record for this object at VizieR.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ 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.
  4. ^ Eggen, Olin J. (1992), "Asymptotic Giant Branch Stars Near the Sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ a b Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars", The Astronomical Journal, 169 (6): 293, doi:10.3847/1538-3881/adc930, ISSN 1538-3881. Note: Full catalogue: [1]
  9. ^ a b 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.
  10. ^ "72 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-09.
  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.
  12. ^ Leo the Lion, Ian Ridpath's Startales, retrieved 2019-02-10.
  13. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
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