Binary star in the constellation Leo
This article is about p
2 Leonis. For other stars with this Bayer designation, see
p Leonis .
61 Leonis Location of 61 Leonis (circled in red)
Observation dataEpoch J2000 Equinox J2000 Constellation Leo [ 1] Right ascension 11h 01m 49.67462s [ 2] Declination −02° 29′ 04.5007″[ 2] Apparent magnitude (V)4.73[ 1] Characteristics Evolutionary stage AGB [ 3] Spectral type M0 III[ 4] B−Vcolor index ± 0.059[ 1] Variable type suspected[ 5] Astrometry Radial velocity (Rv )± 0.3[ 6] km/s Proper motion (μ)RA: +9.76[ 2] mas /yr Dec.: −35.56[ 2] mas /yr Parallax (π)5.58± 0.24 mas [ 2] Distance 580 ± 30 ly pc ) Absolute magnitude (MV )−1.53[ 1] Details Radius 74.5[ 7] R ☉ Luminosity 1,377.86[ 1] L ☉ Surface gravity (log g )± 0.23[ 8] cgs Temperature ± 30[ 8] K Metallicity [Fe/H] ± 0.07[ 8] dex Other designations p2 Leo ,61 Leo ,NSV 5059BD −01°2471FK5 2879HD 95578HIP 53907HR 4299SAO 137947[ 9] Database references SIMBAD data
61 Leonis is a possiblebinary star [ 10] zodiac constellation ofLeo . It is faintly visible to the naked eye, having anapparent visual magnitude of 4.73.[ 1] radial velocity of −12.7 km/s.[ 6] light-years from the Sun, as determined from its annualparallax shift ofmas [ 2]
This is anevolved red giant star with astellar classification of M0 III[ 4] asymptotic giant branch (AGB).[ 3] barium star , showing an enhanced abundance ofs-process elements in its outer atmosphere. This material may have been acquired during a previousmass transfer from a nowwhite dwarf companion, or self-enriched by adredge-up during the AGB process.[ 11] angular diameter after correctly forlimb darkening is± 0.04 mas [ 12] radius of the Sun .[ 7]
61 Leonis is a suspected variable star withapparent magnitude changing between 4.69 and 4.79.[ 5] photometric survey, but has not been confirmed by more recent photometry.[ 13]
^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 ,S2CID 119257644 . ^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 . ^a b Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun",The Astronomical Journal ,104 : 275,Bibcode :1992AJ....104..275E ,doi :10.1086/116239 . ^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 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 . ^a b 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. ^a b Lang, Kenneth R. (2006),Astrophysical formulae Birkhäuser ,ISBN 3-540-29692-1 * ) is given by:2 ⋅ R ∗ = ( 179 ⋅ 3.87 ⋅ 10 − 3 ) AU 0.0046491 AU / R ⨀ ≈ 149 ⋅ R ⨀ {\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(179\cdot 3.87\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 149\cdot R_{\bigodot }\end{aligned}}} ^a b c 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 ^ "61 Leo" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2018-03-01 .^ 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 . ^ Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars",Astronomy and Astrophysics ,319 : 881,Bibcode :1997A&A...319..881G . ^ 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 ^ A. W. J. Cousins (1966). "Fabry photometry of bright southern stars".Royal Greenwich Observatory Bulletins .122 : 59.Bibcode :1966RGOB..122...59C .
