Astronomy:54 Leonis

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Short description: Star in the constellation Leo
54 Leonis
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Leo
54 Leo A
Right ascension  10h 55m 36.80266s[1]
Declination +24° 44′ 59.0440″[1]
Apparent magnitude (V) 4.477[2]
54 Leo B
Right ascension  10h 55m 37.24836s[3]
Declination +24° 44′ 56.5478″[3]
Apparent magnitude (V) 6.29[4]
Characteristics
54 Leo A
Spectral type A0 V[5]
B−V color index +0.001[5]
54 Leo B
Spectral type A2 Vn[5]
B−V color index +0.07[4]
Astrometry
54 Leo A
Radial velocity (Rv)−0.49±0.98[6] km/s
Proper motion (μ) RA: −78.057[1] mas/yr
Dec.: −16.520[1] mas/yr
Parallax (π)9.8275 ± 0.3537[1] mas
Distance330 ± 10 ly
(102 ± 4 pc)
Absolute magnitude (MV)–0.29[7]
54 Leo B
Radial velocity (Rv)1.30±0.92[6] km/s
Proper motion (μ) RA: −75.374[3] mas/yr
Dec.: −18.595[3] mas/yr
Parallax (π)10.1748 ± 0.0569[3] mas
Distance321 ± 2 ly
(98.3 ± 0.5 pc)
Details
54 Leo A
Mass2.4+0.44
−0.36
[8] M
Radius2.88[9] R
Surface gravity (log g)3.5±0.25[8] cgs
Temperature9000±500[8] K
Rotational velocity (v sin i)185[10] km/s
Age411+137
−168
[8] Myr
54 Leo B
Radius2.59[9] R
Rotational velocity (v sin i)250±20[9] km/s
Other designations
54 Leo, BD+25 2314, CCDM J10556+2445, HIP 53417, Struve 1487[11]
54 Leo A: HD 94601, HR 4259, SAO 81583
54 Leo B: HD 94602, HR 4260, SAO 81584
Database references
SIMBADdata

54 Leonis is a binary star[12] system in the zodiac constellation of Leo, located around 321[3] light years from the Sun. It is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 4.30.[13] As of 2017, the pair had an angular separation of 6.60 along a position angle of 113°.[14] They have a physical separation of around 533 astronomical unit|AU (79,700 Gm).[9]

The magnitude 4.477[2] primary, designated component A, is an A-type main-sequence star with a stellar classification of A0 V,[5] which indicates it is generating energy through hydrogen fusion at its core. It has a high rate of spin, showing a projected rotational velocity of 185 km/s. This is giving the star an oblate shape with an equatorial bulge that is an estimated 8% larger than the polar radius.[10] The star is roughly 411[8] million years old with 2.4[8] times the mass of the Sun and about 2.88[9] times the Sun's radius.

The fainter magnitude 6.29[4] secondary, component B, is a smaller A-type main-sequence star with a class of A2 Vn.[5] The 'n' suffix indicates wide "nebulous" lines due to rapid rotation. It is spinning with an even higher projected rotational velocity of 250[9] km/s. The star has about 2.59[9] times the Sun's radius.

Asteroid 729 Watsonia occulted HIP 53417 on March 3, 2013 at 01:48.[15]

References

  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 Høg, E. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27, doi:10.1888/0333750888/2862, Bibcode2000A&A...355L..27H. 
  3. 3.0 3.1 3.2 3.3 3.4 3.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. 4.0 4.1 4.2 Fabricius, C. et al. (2002), "The Tycho double star catalogue", Astronomy and Astrophysics 384: 180–189, doi:10.1051/0004-6361:20011822, Bibcode2002A&A...384..180F 
  5. 5.0 5.1 5.2 5.3 5.4 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode1969AJ.....74..375C. 
  6. 6.0 6.1 Becker, Juliette C. et al. (April 2015), "Extracting Radial Velocities of A- and B-type Stars from Echelle Spectrograph Calibration Spectra", The Astrophysical Journal Supplement Series 217 (2): 13, doi:10.1088/0067-0049/217/2/29, 29, Bibcode2015ApJS..217...29B. 
  7. Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics 361: 614–628, Bibcode2000A&A...361..614P 
  8. 8.0 8.1 8.2 8.3 8.4 8.5 Gullikson, Kevin et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode2016AJ....152...40G. 
  9. 9.0 9.1 9.2 9.3 9.4 9.5 9.6 Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", Monthly Notices of the Royal Astronomical Society 392 (1): 448–454, doi:10.1111/j.1365-2966.2008.14073.x, Bibcode2009MNRAS.392..448H 
  10. 10.0 10.1 Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode2012A&ARv..20...51V. 
  11. "54 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=54+Leo. 
  12. 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  13. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  14. Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal (U. S. Naval Observatory, Washington D.C.) 122 (6): 3466–3471, doi:10.1086/323920, Bibcode2001AJ....122.3466M. 
  15. Pier Paolo Ricci (29 November 2012). Almanacco astronomico 2013 Astronomical almanac 2013. Lulu.com. pp. 322–. ISBN 978-1-291-21157-3. https://books.google.com/books?id=xG0CBAAAQBAJ&pg=PA322.