Gliese 569

An ultraviolet band light curve for a flare on CE Boötis, adapted from Hansen and Veeder (1977)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
A
Right ascension 14h 54m 29.2362s[2]
Declination +16° 06′ 03.798″[2]
Apparent magnitude (V) 10.15[3]
B
Right ascension 14h 54m 29.7686s[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±0.17 km/s
Proper motion (μ) RA: +279.12±0.02 mas/yr[2]
Dec.: −117.91±0.02 mas/yr[2]
Parallax (π)100.5243 ± 0.0210 mas[2]
Distance32.446 ± 0.007 ly
(9.948 ± 0.002 pc)
Orbit[7]
PrimaryGJ 569Ba
CompanionGJ 569Bb
Period (P)863.7±4.2 d
Semi-major axis (a)0.89±0.02 AU
Eccentricity (e)0.312±0.007
Inclination (i)32.4±1.3°
Details[8]
Gliese 569A
Mass0.48 M☉
Radius0.43 R☉
Rotation14.7 d
Age<700[6] Myr
Gliese 569B
Mass0.081+0.059[9] M☉
Radius1.69+1.28 RJup
Temperature2000+2000[6] K
Rotational velocity (v sin i)19+6[6] km/s
Age<700[6] Myr
Other designations
Gliese 569, BD+16 2708, G 136-28, GSC 01478-00495, HIP 72944, 2MASS J14542923+1606039, TYC 1478-495-1, CE Boötis, WDS J14545+1606[10]
Database references
SIMBADdata
B

Gliese 569 is a ternary star system composed of a main-sequence star orbited by a pair of brown dwarfs in the constellation of Boötes about 32 light years away.

System

The primary star GJ 569A is orbited by the much fainter (3.7 magnitudes) secondary GJ 659B at a projected separation of 5.92 arcseconds, discovered in 1988.[11] The star GJ 569B (BD+16 2708B) itself is a close binary system of 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 to precess at timescales of about 100 thousand years due to the gravitational influence of GJ 569A.[6]

Properties

The primary star Gliese 569A is a flare star.[1] The nature of the brown dwarf binary 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 to starspot activity.[12]

References

  1. ^ a b Hansen, 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. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early 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. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early 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. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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. ^ a b c d e f Konopacky, 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, S2CID 51026693
  7. ^ a b Simon, 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, S2CID 3073217
  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, S2CID 55001061
  10. ^ "BD+16 2708", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2021-11-09
  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, S2CID 55001061
  12. ^ a b Kenworthy, 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, S2CID 73707563
  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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