GJ 526

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)184.00 ± 1.07[7] mas
Distance17.7 ± 0.1 ly
(5.43 ± 0.03 pc)
Details
Mass0.28[5] M☉
Radius0.582±0.021[2] R☉
Luminosity0.011[8] L☉
Surface gravity (log g)4.80[3] cgs
Temperature3,474±50[2] K
Metallicity [Fe/H]–0.086[2] dex
Rotational velocity (v sin i)1.00[2] km/s
Other designations
LAL 25372, BD+15°2620, CD+15°2620, HD 119850, HIP 67155, TYC 899-789-1, SAO 100695, Wolf 498,[9] PLX 3135
Database references
SIMBADdata

GJ 526 (Lalande 25372, Wolf 498) 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.

History of observations

This star is known at least from 1801, when it was included to Lalande's stellar catalogue Histoire Céleste Française.[10] In 1847 edition of Lalande's catalogue by Francis Baily it was assigned number 25372, since it sometimes designated as Lalande 25372 or LAL 25372.[11]

High proper motion and proximity

High proper motion of this star and its large parallax were known at least from 1911, when Frank Schlesinger published a paper, where he announced its parallax 152±7 mas and mentioned its proper motion value of 2.3 arcsec.[12]

In 1919 this star was included to high proper motion catalogue by Max Wolf as 498.

Distance

GJ 526 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Schlesinger (1991) 152±7 6.58+0.32
−0.29		 21.5+1
−0.9		 203+9.8
−8.9		 [12]
Woolley et al. (1970) 205±7 4.88+0.17
−0.16		 15.9+0.6
−0.5		 150.5+5.3
−5		 [13]
Gliese & Jahreiß (1991) 184.0±1.3 5.43±0.04 17.73+0.13
−0.12		 167.7±1.2 [14]
van Altena et al. (1995) 184.6±2.8 5.42±0.08 17.67+0.27
−0.26		 167.2+2.6
−2.5		 [15]
Perryman et al. (1997) (Hipparcos) 184.13±1.27 5.43±0.04 17.71±0.12 167.6+1.2
−1.1		 [16]
Perryman et al. (1997) (Tycho) 171.50±11.40 5.8±0.4 19+1.4
−1.2		 179.9+12.8
−11.2		 [17]
Gatewood (2008) 184.00±1.07 5.435+0.032
−0.031		 17.73±0.1 167.7±1 [7]
van Leeuwen (2007) 185.49±1.10 5.39±0.03 17.58±0.1 166.4±1 [18]
RECONS TOP100 (2012) 184.72±0.74[nb 1] 5.414±0.022 17.66±0.07 167±0.7 [19]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

Properties

GJ 526 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,[8] 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.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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.
  6. ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, 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. ↑ 7.0 7.1 Gatewood, George (2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions". The Astronomical Journal 136 (1): 452–460. Bibcode:2008AJ....136..452G. doi:10.1088/0004-6256/136/1/452.
  8. ↑ 8.0 8.1 8.2 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.
  9. ↑ "HD 119850 -- Flare Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2014-01-11.
  10. ↑ Lalande, Joseph Jérôme Le Français de (1801). "Histoire Céleste Française". Paris, Imprimerie de la République. Google Books id: f9AMAAAAYAAJ. Page with GJ 526: 74.
  11. ↑ Baily, Francis; Lalande, Joseph Jérôme Le Français de (1847). "Catalogue of those stars in the Histoire Celeste Francaise of Jerome Delalande, for which tables of reduction to the epoch 1800 habe been published by Prof. Schumacher". London (1847). Bibcode:1847cshc.book.....B. Google Books id: oc0-AAAAcAAJ. Page with GJ 526: 635.
  12. ↑ 12.0 12.1 Schlesinger, F. (1911). "Photographic determinations of stellar parallax made with the Yerkes refractor. V.". The Astrophysical Journal 33: 353–374. Bibcode:1911ApJ....33..353S. doi:10.1086/141859.
  13. ↑ Woolley R.; Epps E. A.; Penston M. J.; Pocock S. B. (1970). "Woolley 526". Catalogue of stars within 25 parsecs of the Sun. Retrieved 2014-11-23.
  14. ↑ Gliese, W. and Jahreiß, H. (1991). "Gl 526". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-11-23.
  15. ↑ Van Altena W. F., Lee J. T., Hoffleit E. D. (1995). "GCTP 3135". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-11-23.
  16. ↑ Perryman et al. (1997). "HIP 67155". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-23.
  17. ↑ Perryman et al. (1997). "HIP 67155". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-23.
  18. ↑ van Leeuwen F. (2007). "HIP 67155". Validation of the new Hipparcos reduction. Retrieved 2014-11-23.
  19. ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-11-23.

Notes

  1. ↑ Weighted parallax based on parallaxes from van Altena et al. (1995), van Leeuwen (2007) and Gatewood (2008).