Gliese 208

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Gliese 208
V2689OriLightCurve.png
A visual band light curve for V2689 Orionis, adapted from Kiraga (2012) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Orion
Right ascension 05h 36m 30.991s [2]
Declination +11° 19′ 40.33″ [2]
Apparent magnitude  (V)8.80 - 9.05 [3]
Characteristics
Spectral type M0.0 Ve [4]
Variable type RS CVn [3]
Astrometry
Radial velocity (Rv)21.772 [5] km/s
Proper motion (μ)RA: −2.811 ± 0.080 [2] mas/yr
Dec.: −56.368 ± 0.060 [2] mas/yr
Parallax (π)87.66±0.29  mas [2]
Distance 37.2 ± 0.1  ly
(11.41 ± 0.04  pc)
Absolute magnitude  (MV)8.6
Details
Mass 0.646 [6]   M☉
Radius 0.601 [6]   R☉
Luminosity 0.08 [7]   L☉
Temperature 3,966 [6]   K
Metallicity [Fe/H]+0.05 [6]   dex
Age 2.7 [6]   Gyr
Other designations
Gliese  208, Gj 208, V2689  Orionis, BD+11°878, HIP  26335, HD  245409, TYC  709-63-1, SAO  94695
Database references
SIMBAD data

Gliese 208 (Gj 208) is a red dwarf star with an apparent magnitude of 8.9. It is 37 light years away in the constellation of Orion. It is an extremely wide binary with 2MASS J0536+1117, an M4 star 2.6 arcminutes away (at least 0.028 light years)

The spectral type of Gj 208 has variously been described between K6 and M1. [8] [9] [10] Two of the most recent observations give a statistically calculated spectral type of K7.9 [6] or a more traditional classification of M0.0 Ve. [4] It is a cool dwarf star and probably a spectroscopic binary. [3]

Calculations from 2010 suggest that this star passed as close as 1.537 parsecs (5.0 light-years) from the Sun about 500,000 years ago. [11]

GJ 208 is an RS Canum Venaticorum variable, close binary systems which show small amplitude brightness changes caused by chromospheric activity. Its visual magnitude varies by about a quarter magnitude with a period of 12.285 days. [3]

References

  1. ↑ Kiraga, M. (March 2012). "ASAS Photometry of ROSAT Sources. I. Periodic Variable Stars Coincident with Bright Sources from the ROSAT All Sky Survey". Acta Astronomica. 62 (1): 67–95. arXiv: 1204.3825 . Bibcode:2012AcA....62...67K. Archived from the original on 4 March 2023. Retrieved 10 February 2022.
  2. 1 2 3 4 5 Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally Published in: Astron. Astrophys. 1337. Bibcode:2016yCat.1337....0G. doi:10.26093/cds/vizier.1337.
  3. 1 2 3 4 Samus, N. N.; Durlevich, O. V.; 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. Bibcode:2009yCat....102025S.
  4. 1 2 Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv: 1206.5991 . Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID   117144290.
  5. ↑ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Crifo, F.; Udry, S.; Hestroffer, D.; Katz, D. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: A64. arXiv: 1302.1905 . Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. S2CID   56094559.
  6. 1 2 3 4 5 6 Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 64. arXiv: 1501.01635 . Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. S2CID   19269312.
  7. ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x . S2CID   118665352.
  8. ↑ Stephenson, C. B. (1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". Astronomical Journal. 92: 139. Bibcode:1986AJ.....92..139S. doi: 10.1086/114146 .
  9. ↑ Stephenson, C. B.; Sanduleak, N. (1975). "Dwarf K and M stars discovered on objective-prism plates". Astronomical Journal. 80: 972. Bibcode:1975AJ.....80..972S. doi: 10.1086/111829 .
  10. ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
  11. ↑ Bobylev, Vadim V. (March 2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. arXiv: 1003.2160 . Bibcode:2010AstL...36..220B. doi:10.1134/S1063773710030060. S2CID   118374161.
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