Gliese 569

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Coordinates: Sky map 14h 54m 29.2359s, +16° 06′ 03.7988″

Gliese 569
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 54m 29.2359s[1]
Declination +16° 06′ 03.7988″[1]
Apparent magnitude (V) 10.15
Characteristics
BD+16 2708A
Evolutionary stage main-sequence star
Spectral type M3
Apparent magnitude (g) 9.123367[2]
BD+16 2708B
Spectral type M8.5+M9[3]
Apparent magnitude (g) 15.324711[4]
Astrometry
Radial velocity (Rv)-8.00±0.17 km/s
Proper motion (μ) RA: 279.12±0.02[2] mas/yr
Dec.: -117.91±0.02[2] mas/yr
Parallax (π)100.5243 ± 0.0210[2] mas
Distance32.446 ± 0.007 ly
(9.948 ± 0.002 pc)
Orbit[5]
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[6]
Gliese 569A
Mass0.48 M
Radius0.43 R
Rotation14.7 d
Age<700[3] Myr
Gliese 569B
Mass0.081+0.059[7] M
Radius1.69+1.28 RJup
Temperature2000+2000[3] K
Rotational velocity (v sin i)19+6[3] km/s
Age<700[3] Myr
Other designations
Gliese 569, BD+16 2708, G 136-28, GSC 01478-00495, HIP 72944, 2MASS J14542923+1606039, TYC 1478-495-1, CE Bootis
BD+16 2708A: Gliese 569A, Gaia DR2 1187851653287128576, Gaia EDR3 1866704219781935360, WDS J14545+1606A
BD+16 2708B: Gliese 569B, Gliese 569Bab, Gaia DR2 1187851653286799488, Gaia EDR3 1866704219775706624, WDS J14545+1606B
Database references
SIMBAD2708 data

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 stellar magnitudes) secondary GJ 659B at a projected separation of 5.92 arcseconds, discovered in 1988.[8] 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,[8] and a small (0.538±0.048) magnitude difference between components.[9] 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.[3]

Properties[]

The primary star Gliese 569A is a flare star.[10] The nature of 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.[5] Both brown dwarfs are weakly variable, likely due to starspot activity.[8]

References[]

  1. ^ a b "BD+16 2708". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-09.
  2. ^ 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. Gaia EDR3 record for this source at VizieR.
  3. ^ 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
  4. ^ 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. Gaia EDR3 record for this source at VizieR.
  5. ^ 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
  6. ^ 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
  7. ^ 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
  8. ^ a b c 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
  9. ^ 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
  10. ^ 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
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