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Gliese 569

Coordinates:Sky map14h54m29.2359s,+16° 06′ 03.7988″
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Gliese 569

Anultraviolet bandlight curvefor a flare on CE Boötis, adapted from Hansen and Veeder (1977)[1]
Observation data
EpochJ2000EquinoxJ2000
Constellation Boötes
A
Right ascension 14h54m29.2362s[2]
Declination +16° 06′ 03.798″[2]
Apparent magnitude(V) 10.15[3]
B
Right ascension 14h54m29.7686s[4]
Declination +16° 06′ 05.627″[4]
Characteristics
BD+16 2708A
Evolutionary stage main-sequence star
Spectral type M3
Apparent magnitude(g) 9.12[2]
Variable type Flare star[5]
BD+16 2708B
Spectral type M8.5+M9[6]
Apparent magnitude(g) 15.32[4]
Astrometry
A
Radial velocity(Rv)−8.00±0.17km/s
Proper motion(μ)RA:+279.12±0.02mas/yr[2]
Dec.:−117.91±0.02mas/yr[2]
Parallax(π)100.5243 ± 0.0210mas[2]
Distance32.446 ± 0.007ly
(9.948 ± 0.002pc)
Orbit[7]
PrimaryGJ 569Ba
CompanionGJ 569Bb
Period(P)863.7±4.2d
Semi-major axis(a)0.89±0.02AU
Eccentricity(e)0.312±0.007
Inclination(i)32.4±1.3°
Details[8]
Gliese 569A
Mass0.48M☉
Radius0.43R☉
Rotation14.7d
Age<700[6]Myr
Gliese 569B
Mass0.081+0.059[9]M☉
Radius1.69+1.28RJup
Temperature2000+2000[6]K
Rotational velocity(vsini)19+6[6]km/s
Age<700[6]Myr
Other designations
Gliese 569, BD+16 2708, G 136-28, GSC 01478-00495, HIP 72944,2MASSJ14542923+1606039, TYC 1478-495-1, CE Boötis, WDS J14545+1606[10]
Database references
SIMBADdata
B

Gliese 569is a ternary star system composed of amain-sequence starorbited by a pair ofbrown dwarfsin the constellation ofBoötesabout32light yearsaway.

System

[edit]

The primary star GJ 569A is orbited by the much fainter (3.7magnitudes) secondary GJ 659B at a projected separation of5.92arcseconds,discovered in 1988.[11]The star GJ 569B (BD+16 2708B) itself is a closebinary systemof two high-mass brown dwarfs in a 2.4-year orbit,[12]and a small (0.538±0.048) magnitude difference between components.[13]The orbital plane of close binary GJ 569Ba and GJ 569Bb is expected toprecessat timescales of about 100 thousand years due to the gravitational influence of GJ 569A.[6]

Properties

[edit]

The primary star Gliese 569A is a flare star.[1]The nature of thebrown dwarfbinary Gliese 569B is highly uncertain, and it was even suspected Gliese 569Ba itself may be either a low-mass star or a binary object.[7]Both brown dwarfs are weakly variable, likely due tostarspotactivity.[12]

References

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  1. ^abHansen, O. L.; Veeder, G. L. (June 1977), "Flare Activity on Gl 569",Information Bulletin on Variable Stars,1292(1): 1,Bibcode:1977IBVS.1292....1H
  2. ^abcdeBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  3. ^Koen, C.; et al. (April 21, 2010), "UBV(RI)CJHK observations of Hipparcos-selected nearby stars ",Monthly Notices of the Royal Astronomical Society,403(4): 1949–1968,Bibcode:2010MNRAS.403.1949K,doi:10.1111/j.1365-2966.2009.16182.x
  4. ^abcBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  5. ^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:B/gcvs,Bibcode:2009yCat....102025S
  6. ^abcdefKonopacky, Q. M.; Ghez, A. M.; Fabrycky, D. C.; MacIntosh, B. A.; White, R. J.; Barman, T. S.; Rice, E. L.; Hallinan, G.; Duchêne, G. (May 2012), "Rotational velocities of individual components in very low mass binaries",The Astrophysical Journal,750(1): 14,arXiv:1202.5555,Bibcode:2012ApJ...750...79K,doi:10.1088/0004-637X/750/1/79,S2CID51026693
  7. ^abSimon, M.; Bender, C.; Prato, L. (June 2006), "The Gl569 multiple system",The Astrophysical Journal,644(2): 1183–1192,arXiv:astro-ph/0603165,Bibcode:2006ApJ...644.1183S,doi:10.1086/503867,S2CID3073217
  8. ^Lund, K.; Jardine, M.; Russell, A J B.; Donati, J-F; Fares, R.; Folsom, C. P.; Jeffers, S. V.; Marsden, S. C.; Morin, J.; Petit, P.; See, V. (April 2021), "Field linkage and magnetic helicity density",Monthly Notices of the Royal Astronomical Society,502(4): 4903–4910,arXiv:2102.11238,Bibcode:2021MNRAS.502.4903L,doi:10.1093/mnras/stab305
  9. ^Femenía, B.; Rebolo, R.; Pérez-Prieto, J. A.; Hildebrandt, S. R.; Labadie, L.; Pérez-Garrido, A.; Béjar, V. J. S.; Díaz-Sánchez, A.; Villó, I.; Oscoz, A.; López, R.; Rodríguez, L. F.; Piqueras, J. (May 2011), "Lucky imaging adaptive optics of the brown dwarf binary GJ569Bab",Monthly Notices of the Royal Astronomical Society,413(3): 1524–1536,arXiv:1012.4421,Bibcode:2011MNRAS.413.1524F,doi:10.1111/j.1365-2966.2011.18226.x,S2CID55001061
  10. ^"BD+16 2708",SIMBAD,Centre de données astronomiques de Strasbourg,retrieved2021-11-09
  11. ^Forrest, Skrutskie and Shure (1988), "A possible brown dwarf companion to Gliese 569",Astrophysical Journal Letters,330(3): L119–L123,arXiv:1012.4421,Bibcode:2011MNRAS.413.1524F,doi:10.1111/j.1365-2966.2011.18226.x,S2CID55001061
  12. ^abKenworthy, Matthew A.; Scuderi, Louis J. (June 2012), "Infrared variability of the Gliese 569B system",The Astrophysical Journal,752(2): 131,arXiv:1204.3454,Bibcode:2012ApJ...752..131K,doi:10.1088/0004-637X/752/2/131,S2CID73707563
  13. ^Beltramo-Martin, O.; Correia, C. M.; Ragland, S.; Jolissaint, L.; Neichel, B.; Fusco, T.; Wizinowich, P. L. (August 2019), "PRIME: PSF Reconstruction and Identification for Multiple-source characterization Enhancement - application to Keck NIRC2 imager",Monthly Notices of the Royal Astronomical Society,487(4): 5450–5462,arXiv:1903.02772,Bibcode:2019MNRAS.487.5450B,doi:10.1093/mnras/stz1667
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