Astronomy:Gliese 569
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Short description: Nearby red dwarf in the constellation Boötes
Coordinates: 
14h 54m 29.2359s, +16° 06′ 03.7988″
250px An ultraviolet band light curve for a flare on CE Boötis, adapted from Hansen and Veeder (1977)[1] | |
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Boötes |
| Gliese 569 A | |
| Right ascension | 14h 54m 29.2362s[2] |
| Declination | +16° 06′ 03.798″[2] |
| Apparent magnitude (V) | 10.15[3] |
| Gliese 569 B | |
| Right ascension | 14h 54m 29.7686s[4] |
| Declination | +16° 06′ 05.627″[4] |
| Apparent magnitude (V) | |
| Characteristics | |
| Gliese 569 A | |
| Evolutionary stage | main-sequence star |
| Spectral type | M3 |
| Apparent magnitude (g) | 9.12[2] |
| Variable type | Flare star[5] |
| Gliese 569 B | |
| 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[2] mas/yr Dec.: −117.91±0.02[2] mas/yr |
| Parallax (π) | 100.5243 ± 0.0210[2] mas |
| Distance | 32.446 ± 0.007 ly (9.948 ± 0.002 pc) |
| Orbit[7] | |
| Primary | Gliese 569 Ba |
| Companion | Gliese 569 Bb |
| 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 | |
| Gliese 569 A | |
| Mass | 0.48[8] M☉ |
| Radius | 0.43[8] R☉ |
| Luminosity | 0.034±0.008[9] L☉ |
| Temperature | 3,649±79[9] K |
| Rotation | 14.7[8] days |
| Age | <700[6] Myr |
| Gliese 569 Ba | |
| Mass | 0.081±0.010[10] M☉ |
| Radius | 0.119±0.020[11] R☉ |
| Luminosity | 4.5+0.8 −0.7×10−4[11] L☉ |
| Surface gravity (log g) | 4.5[11] cgs |
| Temperature | 2,440±100[11] K |
| Rotational velocity (v sin i) | 19[6] km/s |
| Age | <700[6] Myr |
| Gliese 569 Bb | |
| Mass | 0.059±0.007[10] M☉ |
| Radius | 0.102±0.020[11] R☉ |
| Luminosity | 2.6+0.5 −0.4×10−4[11] L☉ |
| Surface gravity (log g) | 4.5[11] cgs |
| Temperature | 2,305±100[11] K |
| Rotational velocity (v sin i) | 6[6] km/s |
| Age | <700[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | Gliese 569 A |
| Gliese 569 B | |
Gliese 569 is a star in the constellation Boötes. It is orbited by a pair of brown dwarfs. The system lies 32.45 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.[13] 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,[14] and a small (0.538±0.048) magnitude difference between components.[15] 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 star was given its variable star designation, CE Boötis, in 1975.[16] 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. But with a mass about 8-9% that of the Sun means it may possibly be a binary of two extremely low mass ultra-cool dwarf stars that are extremely dim, dim enough to look like a brown dwarf.[7] Both brown dwarfs are weakly variable, likely due to starspot activity.[14]
References
- ↑ 1.0 1.1 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
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 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, doi:10.1111/j.1365-2966.2009.16182.x, Bibcode: 2010MNRAS.403.1949K
- ↑ 4.0 4.1 4.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Samus, N. N. 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
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Konopacky, Q. M.; Ghez, A. M.; Fabrycky, D. C.; MacIntosh, B. A.; White, R. J.; Barman, T. S.; Rice, E. L.; Hallinan, G. et al. (May 2012), "Rotational velocities of individual components in very low mass binaries", The Astrophysical Journal 750 (1): 14, doi:10.1088/0004-637X/750/1/79, Bibcode: 2012ApJ...750...79K
- ↑ 7.0 7.1 Simon, M.; Bender, C.; Prato, L. (June 2006), "The Gl569 multiple system", The Astrophysical Journal 644 (2): 1183–1192, doi:10.1086/503867, Bibcode: 2006ApJ...644.1183S
- ↑ 8.0 8.1 8.2 Lund, K.; Jardine, M.; Russell, A J B.; Donati, J-F; Fares, R.; Folsom, C. P.; Jeffers, S. V.; Marsden, S. C. et al. (April 2021), "Field linkage and magnetic helicity density", Monthly Notices of the Royal Astronomical Society 502 (4): 4903–4910, doi:10.1093/mnras/stab305, Bibcode: 2021MNRAS.502.4903L
- ↑ 9.0 9.1 Gaidos, E.; Mann, A. W.; Lépine, S.; Buccino, A.; James, D.; Ansdell, M.; Petrucci, R.; Mauas, P. et al. (2014), "Trumpeting M dwarfs with CONCH-SHELL: A catalogue of nearby cool host-stars for habitable exoplanets and life", Monthly Notices of the Royal Astronomical Society 443 (3): 2561, doi:10.1093/mnras/stu1313, Bibcode: 2014MNRAS.443.2561G
- ↑ 10.0 10.1 Femenía, B.; Rebolo, R.; Pérez-Prieto, J. A.; Hildebrandt, S. R.; Labadie, L.; Pérez-Garrido, A.; Béjar, V. J. S.; Díaz-Sánchez, A. et al. (May 2011), "Lucky imaging adaptive optics of the brown dwarf binary GJ569Bab", Monthly Notices of the Royal Astronomical Society 413 (3): 1524–1536, doi:10.1111/j.1365-2966.2011.18226.x, Bibcode: 2011MNRAS.413.1524F
- ↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 11.7 Zapatero Osorio, M. R.; Lane, B. F.; Pavlenko, Ya.; Martin, E. L.; Britton, M.; Kulkarni, S. R. (2004-11-10), "Dynamical Masses of the Binary Brown Dwarf GJ 569 Bab", The Astrophysical Journal 615 (2): 958–971, doi:10.1086/424507, ISSN 0004-637X
- ↑ "BD+16 2708". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B16+2708.
- ↑ Forrest, Skrutskie and Shure (1988), "A possible brown dwarf companion to Gliese 569", Astrophysical Journal Letters 330 (3): L119–L123, doi:10.1111/j.1365-2966.2011.18226.x, Bibcode: 2011MNRAS.413.1524F
- ↑ 14.0 14.1 Kenworthy, Matthew A.; Scuderi, Louis J. (June 2012), "Infrared variability of the Gliese 569B system", The Astrophysical Journal 752 (2): 131, doi:10.1088/0004-637X/752/2/131, Bibcode: 2012ApJ...752..131K
- ↑ 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, doi:10.1093/mnras/stz1667, Bibcode: 2019MNRAS.487.5450B
- ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P. (November 1975). "61st Name-List of Variable Stars". Information Bulletin on Variable Stars 1068: 1. Bibcode: 1975IBVS.1068....1K. https://ibvs.konkoly.hu/pub/ibvs/1001/1068.pdf. Retrieved 5 December 2024.
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