Summary
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 AU (79,700 Gm).[9]
| Observation data Epoch J2000.0 Equinox | |
|---|---|
| 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 mas[1] |
| Distance | 330 ± 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 mas[3] |
| Distance | 321 ± 2 ly (98.3 ± 0.5 pc) |
| Details | |
| 54 Leo A | |
| Mass | 2.4+0.44 −0.36[8] M☉ |
| Radius | 2.88[9] R☉ |
| Surface gravity (log g) | 3.5±0.25[8] cgs |
| Temperature | 9000±500[8] K |
| Rotational velocity (v sin i) | 185[10] km/s |
| Age | 411+137 −168[8] Myr |
| 54 Leo B | |
| Radius | 2.59[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 | |
| SIMBAD | data |
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 edit
- ^ 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.
- ^ a b Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
- ^ a b c d e f 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 Fabricius, C.; et al. (2002), "The Tycho double star catalogue", Astronomy and Astrophysics, 384: 180–189, Bibcode:2002A&A...384..180F, doi:10.1051/0004-6361:20011822
- ^ a b c d e Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b 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, arXiv:1503.03874, Bibcode:2015ApJS..217...29B, doi:10.1088/0067-0049/217/2/29, S2CID 33968873, 29.
- ^ 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, Bibcode:2000A&A...361..614P
- ^ a b c d e f Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
- ^ a b c d e f g 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, Bibcode:2009MNRAS.392..448H, doi:10.1111/j.1365-2966.2008.14073.x
- ^ a b Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- ^ "54 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-05.
- ^ 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.
- ^ 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.
- ^ 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, 122 (6), U. S. Naval Observatory, Washington D.C.: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
- ^ Pier Paolo Ricci (29 November 2012). Almanacco astronomico 2013 Astronomical almanac 2013. Lulu.com. pp. 322–. ISBN 978-1-291-21157-3.