Astronomy:Gliese 208

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Short description: Red dwarf star in the constellation Orion
Gliese 208
V2689OriLightCurve.png
A visual band light curve for V2689 Orionis, adapted from Kiraga (2012)[1]
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance37.2 ± 0.1 ly
(11.41 ± 0.04 pc)
Absolute magnitude (MV)8.6
Details
Mass0.646[6] M☉
Radius0.601[6] R☉
Luminosity0.08[7] L☉
Temperature3,966[6] K
Metallicity [Fe/H]+0.05[6] dex
Age2.7[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
SIMBADdata

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. Bibcode: 2012AcA....62...67K. https://ui.adsabs.harvard.edu/abs/2012AcA....62...67K. Retrieved 10 February 2022. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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. 
  3. ↑ 3.0 3.1 3.2 3.3 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. Bibcode: 2009yCat....102025S. 
  4. ↑ 4.0 4.1 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. doi:10.1088/0004-6256/145/4/102. Bibcode: 2013AJ....145..102L. 
  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. doi:10.1051/0004-6361/201220927. Bibcode: 2013A&A...552A..64S. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 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. doi:10.1088/0004-637X/804/1/64. Bibcode: 2015ApJ...804...64M. 
  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. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M. 
  8. ↑ Stephenson, C. B. (1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". Astronomical Journal 92: 139. doi:10.1086/114146. Bibcode: 1986AJ.....92..139S. 
  9. ↑ Stephenson, C. B.; Sanduleak, N. (1975). "Dwarf K and M stars discovered on objective-prism plates". Astronomical Journal 80: 972. doi:10.1086/111829. Bibcode: 1975AJ.....80..972S. 
  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. doi:10.1134/S1063773710030060. Bibcode: 2010AstL...36..220B. 

External links

  • Wikisky image of HD 245409 (Gliese 208)



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