GJ 526
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 45m 43.77665s[1] |
| Declination | +14° 53′ 29.4635″[1] |
| Apparent magnitude (V) | 8.464[2] |
| Characteristics | |
| Spectral type | M1.5 V[3] |
| U−B color index | +1.04[4] |
| B−V color index | +1.48[4] |
| Variable type | Flare[5] |
| Astrometry | |
| Radial velocity (Rv) | +15.3[6] km/s |
| Proper motion (μ) | RA: +1778.45[1] mas/yr Dec.: –1456.44[1] mas/yr |
| Parallax (π) | 185.49 ± 1.10[1] mas |
| Distance | 17.6 ± 0.1 ly (5.39 ± 0.03 pc) |
| Details | |
| Mass | 0.28[5] M☉ |
| Radius | 0.582 ± 0.021[2] R☉ |
| Luminosity | 0.011[7] L☉ |
| Surface gravity (log g) | 4.80[3] cgs |
| Temperature | 3,474 ± 50[2] K |
| Metallicity [Fe/H] | –0.086[2] dex |
| Rotational velocity (v sin i) | 1.00[2] km/s |
| Other designations | |
GJ 526 is a red dwarf star in the northern constellation of Boötes. It has an apparent visual magnitude of 8.5,[2] which is too faint to be seen with the naked eye. Based upon an annual parallax shift of 0.18549 arc seconds as measured by the Hipparcos satellite, this system is 17.6 light-years (5.39 parsecs) from Earth.
This is a flare star, which means it undergoes sporadic increases in brightness of up to 1–6 magnitudes.[5] It is a main sequence star with a stellar classification of M1.5 V.[3] GJ 526 is smaller than the Sun, with 28%[5] of the mass and 5.82[2] of the radius. It shines with just 1.1% of the luminosity of the Sun,[7] with the stellar atmosphere radiating at an effective temperature of 3,474 K.[2]
GJ 526 has been examined for an excess of radiation in the infrared. The presence of an infrared excess can be taken as an indication of a debris disk orbiting the star. However, no such excess was discovered around GJ 526.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Houdebine, E. R. (September 2011), "Observation and modelling of main-sequence star chromospheres - XVI. Rotation of dK5 stars", Monthly Notices of the Royal Astronomical Society 407 (3): 1657–1673, Bibcode:2011MNRAS.416.2233H, doi:10.1111/j.1365-2966.2011.19199.x.
- ↑ 3.0 3.1 3.2 Frasca, A. et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics 508 (3): 1313–1330, Bibcode:2009A&A...508.1313F, doi:10.1051/0004-6361/200913327.
- ↑ 4.0 4.1 Cowley, A. P.; Hiltner, W. A.; Witt, A. N. (December 1967), "Spectral classification and photometry of high proper motion stars", Astronomical Journal 72: 1334–1340, Bibcode:1967AJ.....72.1334C, doi:10.1086/110413.
- ↑ 5.0 5.1 5.2 5.3 Gershberg, R. E. et al. (November 1999), "Catalogue and bibliography of the UV Cet-type flare stars and related objects in the solar vicinity", Astronomy and Astrophysics Supplement 139: 555–558, Bibcode:1999A&AS..139..555G, doi:10.1051/aas:1999407.
- ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
- ↑ 7.0 7.1 7.2 Avenhaus, H. et al. (December 2012), "The nearby population of M-dwarfs with WISE: a search for warm circumstellar dust", Astronomy & Astrophysics 548: A105, arXiv:1209.0678, Bibcode:2012A&A...548A.105A, doi:10.1051/0004-6361/201219783.
- ↑ "HD 119850 -- Flare Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2014-01-11.
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