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HR 5553

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HR 5553

Avisual bandlight curvefor DE Boötes, adapted from Henryet al.(1995)[1]
Observation data
EpochJ2000EquinoxJ2000
Constellation Boötes
Right ascension 14h53m23.76674s[2]
Declination +19° 09′ 10.0813″[2]
Apparent magnitude(V) 6.00[3](5.97 to 6.04)[4]
Characteristics
Spectral type K0 V[5]
U−Bcolor index +0.49[5]
B−Vcolor index +0.84[5]
Variable type RS CVn[4]
Astrometry
Radial velocity(Rv)−29.82±0.15[6]km/s
Proper motion(μ)RA:−442.23[2]mas/yr
Dec.:+217.61[2]mas/yr
Parallax(π)86.88 ± 0.46mas[2]
Distance37.5 ± 0.2ly
(11.51 ± 0.06pc)
Absolute magnitude(MV)5.69[7]
Orbit[8]
Period(P)125.396±0.001 d
Semi-major axis(a)0.19±0.03AU
Eccentricity(e)0.51±0.001
Inclination(i)93.4±4.2°
Longitude of the node(Ω)248.3±3.6°
Argument of periastron(ω)
(secondary)		219±0.1°
Details
HR 5553 A
Mass0.84[9]M☉
Radius0.86[9]R☉
Luminosity0.498[9]L☉
Surface gravity(logg)4.57[10]cgs
Temperature5,313[10]K
Metallicity[Fe/H]0.10[10]dex
Rotation10.4[10]
Rotational velocity(vsini)4.0[10]km/s
Age0.7–1.3[11]Gyr
HR 5553 B
Mass0.45[5]M☉
Other designations
DE Boo,BD+19°2881,GJ567,HD131511,HIP72848,LHS5279[12]
Database references
SIMBADdata

HR 5553is abinary starsystem located thirty-eightlight-yearsaway from theSun,in the northernconstellationBoötes.It has thevariable star designationDE Boötis,and is classified as anRS Canum Venaticorum variablethat ranges inapparent visual magnitudefrom 5.97 down to 6.04,[4]which is bright enough to be dimly visible to the naked eye. The system is drifting closer to theSunwith aradial velocityof −30 km/s,[6]and is expected to come as close as 26.9 light-years in 210,000 years.[13]

Orbital elements for this single-linedspectroscopic binarywas first calculated in 1981 using radial velocity measurements fromDavid Dunlap Observatorycombined with older measurements fromMount Wilson ObservatoryandDominion Astrophysical Observatory.[14]The two stars orbit each other with aperiodof 125 days and a largeeccentricityof 0.51.[5]

The primary, designated component A, is aK-type main sequence starwith astellar classificationof K0 V. It is around one[11]billion years old and is spinning with aprojected rotational velocityof 4 km/s.[10]The star has 84% of themass of the Sunand 86% of theSun's radius.[9]It is radiating 50%[9]of theluminosity of the Sunfrom itsphotosphereat aneffective temperatureof 5,313 K.[10]Component B has an estimated 45% of the mass of the Sun.[5]

Aninfrared excesshas been detected around this system, most likely indicating the presence of acircumstellar diskat a radius of 34.2AU.The temperature of this dust is 40 K.[10]The estimated mass of the dust is 0.0002 times the mass of theEarth.It is aligned to within 10° of the plane of the binary system.[9][8]

References

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  1. ^Henry, Gregory W.; Fekel, Francis C.; Hall, Douglas S. (December 1995)."An Automated Search for Variability in Chromospherically Active Stars".The Astronomical Journal.110(6): 2926–2967.Bibcode:1995AJ....110.2926H.doi:10.1086/117740.Retrieved5 November2021.
  2. ^abcdevan Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474(2): 653–664,arXiv:0708.1752v1,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID18759600.
  3. ^Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data. SIMBAD,Bibcode:1986EgUBV........0M.
  4. ^abcSamus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1".Astronomy Reports.61(1): 80.Bibcode:2017ARep...61...80S.doi:10.1134/S1063772917010085.S2CID125853869.
  5. ^abcdefKennedy, Grant M. (February 2015), "Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper belt analogue around HD 131511",Monthly Notices of the Royal Astronomical Society: Letters,447(1): L75–L79,arXiv:1412.0674,Bibcode:2015MNRAS.447L..75K,doi:10.1093/mnrasl/slu190,S2CID53686506.
  6. ^abKarataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. (2004)."Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution".Monthly Notices of the Royal Astronomical Society.349(3): 1069–1092.arXiv:astro-ph/0404219.Bibcode:2004MNRAS.349.1069K.doi:10.1111/j.1365-2966.2004.07588.x.S2CID15290475.
  7. ^Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics",Astronomy and Astrophysics,501(3): 941–947,arXiv:0811.3982,Bibcode:2009A&A...501..941H,doi:10.1051/0004-6361/200811191,S2CID118577511.
  8. ^abKennedy, G. M. (February 2015)."Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper Belt analogue around HD 131511".Monthly Notices of the Royal Astronomical Society.447(1): L75–L79.arXiv:1412.0674.Bibcode:2015MNRAS.447L..75K.doi:10.1093/mnrasl/slu190.
  9. ^abcdefMarshall, J. P.; et al. (October 2014), "Interpreting the extended emission around three nearby debris disc host stars",Astronomy & Astrophysics,570:13,arXiv:1408.5649,Bibcode:2014A&A...570A.114M,doi:10.1051/0004-6361/201424517,S2CID119232172,A114.
  10. ^abcdefghEiroa, C.; et al. (July 2013), "DUst around NEarby Stars. The survey observational results",Astronomy & Astrophysics,555:A11,arXiv:1305.0155,Bibcode:2013A&A...555A..11E,doi:10.1051/0004-6361/201321050,S2CID377244.
  11. ^abMamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics",The Astrophysical Journal,687(2): 1264–1293,arXiv:0807.1686,Bibcode:2008ApJ...687.1264M,doi:10.1086/591785,S2CID27151456.
  12. ^"DE Boo".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-12-07.
  13. ^Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release".Astronomy & Astrophysics.616:A37.arXiv:1805.07581.Bibcode:2018A&A...616A..37B.doi:10.1051/0004-6361/201833456.S2CID56269929.
  14. ^Kamper, K. W.; Lyons, R. W. (1981). "The Spectroscopic Orbits of HD131511".Journal of the Royal Astronomical Society of Canada.75:56–58.Bibcode:1981JRASC..75...56K.
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