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 0.184 arc seconds as measured by the Hipparcos satellite, this system is 17.7 light-years (5.43 parsecs) from Earth.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 45m 43.776s[1] |
| Declination | +14° 53′ 29.47″[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: +1,776.006 mas/yr[1] Dec.: −1,455.156 mas/yr[1] |
| Parallax (π) | 183.9962 ± 0.0253 mas[1] |
| Distance | 17.726 ± 0.002 ly (5.4349 ± 0.0007 pc) |
| Details | |
| Mass | 0.472±0.02[7] M☉ |
| Radius | 0.488±0.008[7] R☉ |
| Luminosity | (3.651±0.127)×10−2[7] L☉ |
| Surface gravity (log g) | 4.79±0.07[7] cgs |
| Temperature | 3,678±51[7] K |
| Metallicity [Fe/H] | –0.086[2] dex |
| Rotation | 52.3±1.7 d[8] |
| Rotational velocity (v sin i) | 1.00[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
  Gliese 526 Location of Gliese 526 in the constellation Boötes | |
History of observations
editThis star is known at least from 1801, when it was included to Lalande's stellar catalogue Histoire céleste française.[11] 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.[12]
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.[13] In 1919, German astronomer Max Wolf included GJ 526 in his catalogue of high proper motion stars, giving it the identifier 498.[14]
Properties
edit
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 red dwarf with a stellar classification of M1.5 V.[3] GJ 526 is smaller than the Sun, with 47% of the mass and 49% of the radius. It shines with just 3.6% of the luminosity of the Sun, with its stellar atmosphere radiating at an effective temperature of 3,678 K.[7]
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.[16]
References
edit- ^ a b c d 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.
- ^ a b c d 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.
- ^ a b 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, arXiv:0911.0760, Bibcode:2009A&A...508.1313F, doi:10.1051/0004-6361/200913327, S2CID 118361131.
- ^ a b 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.
- ^ a b 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 (3): 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; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
- ^ a b c d e f Schweitzer, Andreas; Passegger, V. M.; Cifuentes, C.; Bejar, V. J. S.; Cortes-Contreras, M.; Caballero, J. A.; del Burgo, C.; Czesla, S.; Kuerster, M.; Montes, D.; Osorio, M. R. Zapatero; Ribas, I.; Reiners, A.; Quirrenbach, A.; Amado, P. J. (May 2019). "The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars". Astronomy & Astrophysics. 625: A68. arXiv:1904.03231. doi:10.1051/0004-6361/201834965. ISSN 0004-6361.
- ^ Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441, S2CID 119181646.
- ^ "HD 119850". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-01-11.
- ^ 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.
- ^ Lalande, Joseph Jérôme Le Français de (1801). "Histoire céleste française". Paris, Imprimerie de la République. Google Books id: f9AMAAAAYAAJ. Page with GJ 526: 74
- ^ Baily, Francis; Lalande, Joseph Jérôme Le Français de (1847). "Catalogue of those stars in the Histoire céleste française of Jérôme Delalande, for which tables of reduction to the epoch 1800 habe been published by Prof. Schumacher". London (1847). Bibcode:1847cshc.book.....B Archived 2015-10-17 at the Wayback Machine. Google Books id: oc0-AAAAcAAJ. Page with GJ 526: 635.
- ^ 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.
- ^ Wolf, M. (1919), "Katalog von 1053 staerker bewegten Fixsternen", Veroeffentlichungen der Badischen Sternwarte zu Heidelberg (in German), 7 (10): 195–219, Bibcode:1919VeHei...7..195W.
- ^ Bruno, G.; Pagano, I.; Scandariato, G.; Florén, H. G.; Brandeker, A.; Olofsson, G.; Maxted, P. F. L.; Fortier, A.; Sousa, S. G.; Sulis, S.; Van Grootel, V.; Garai, Z.; Boldog, A.; Kriskovics, L.; Szabó, Gy. M.; Gandolfi, D.; Alibert, Y.; Alonso, R.; Bárczy, T.; Barrado Navascues, D.; Barros, S. C. C.; Baumjohann, W.; Beck, M.; Beck, T.; Benz, W.; Billot, N.; Borsato, L.; Broeg, C.; Collier Cameron, A.; Csizmadia, Sz.; Cubillos, P. E.; Davies, M. B.; Deleuil, M.; Deline, A.; Delrez, L.; Demangeon, O. D. J.; Demory, B. O.; Ehrenreich, D.; Erikson, A.; Farinato, J.; Fossati, L.; Fridlund, M.; Gillon, M.; Güdel, M.; Günther, M. N.; Heitzmann, A.; Helling, Ch.; Hoyer, S.; Isaak, K. G.; Kiss, L. L.; Lam, K. W. F.; Laskar, J.; Lecavelier des Etangs, A.; Lendl, M.; Magrin, D.; Mordasini, C.; Nascimbeni, V.; Ottensamer, R.; Pallé, E.; Peter, G.; Piotto, G.; Pollacco, D.; Queloz, D.; Ragazzoni, R.; Rando, N.; Ratti, F.; Rauer, H.; Ribas, I.; Santos, N. C.; Sarajlic, M.; Ségransan, D.; Simon, A. E.; Singh, V.; Smith, A. M. S.; Stalport, M.; Thomas, N.; Udry, S.; Ulmer, B.; Venturini, J.; Villaver, E.; Walton, N. A.; Wilson, T. G. (June 2024). "Detailed cool star flare morphology with CHEOPS and TESS" (PDF). Astronomy & Astrophysics. 686: A239. Bibcode:2024A&A...686A.239B. doi:10.1051/0004-6361/202348951. Retrieved 23 September 2024.
- ^ 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, S2CID 56397054.