61 Leonis

61 Leonis is a possible binary star[9] system in the zodiac constellation of Leo. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.73.[2] The star is moving closer to the Sun with a heliocentric radial velocity of −12.7 km/s.[5] It is located roughly 580 light years from the Sun, as determined from its annual parallax shift of 5.58 mas.[1]

This article is about p2 Leonis. For other stars with this Bayer designation, see p Leonis.
61 Leonis
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 01m 49.67462s[1]
Declination −02° 29′ 04.5007″[1]
Apparent magnitude (V) 4.73[2]
Characteristics
Spectral type M0 III[3]
B−V color index +1.593±0.059[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−12.7±0.3[5] km/s
Proper motion (μ) RA: +9.76[1] mas/yr
Dec.: −35.56[1] mas/yr
Parallax (π)5.58 ± 0.24[1] mas
Distance580 ± 30 ly
(179 ± 8 pc)
Absolute magnitude (MV)−1.53[2]
Details
Radius74.5[6] R☉
Luminosity1377.86[2] L☉
Surface gravity (log g)1.25±0.23[7] cgs
Temperature3,864±30[7] K
Metallicity [Fe/H]0.07±0.07[7] dex
Other designations
p2 Leo, 61 Leo, NSV 5059, BD−01° 2471, FK5 2879, HD 95578, HIP 53907, HR 4299, SAO 137947[8]
Database references
SIMBADdata

This is an evolved red giant star with a stellar classification of M0 III[3] that Eggen (1992) listed as being on the asymptotic giant branch (AGB).[10] It is a marginal barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material may have been acquired during a previous mass transfer from a now white dwarf companion, or self-enriched by a dredge-up during the AGB process.[11] The measured angular diameter after correctly for limb darkening is 3.87±0.04 mas,[12] which, at the estimated distance of this system yields a physical size of about 74.5 times the radius of the Sun.[6]

61 Leonis is a suspected variable star with apparent magnitude changing between 4.69 and 4.79.[4] The variability was reported in a 1966 photometric survey, but has not been confirmed by more recent photometry.[13]

References
  1. 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.
  2. 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.
  3. 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
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439
  8. "61 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-01.
  9. 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.
  10. Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  11. Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.
  12. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  13. A. W. J. Cousins (1966). "Fabry photometry of bright southern stars". Royal Greenwich Observatory Bulletins. 122: 59. Bibcode:1966RGOB..122...59C.
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