Ross 128

Ross 128
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 11h 47m 44.3964s[1]
Declination +00° 48′ 16″[1]
Apparent magnitude (V) 11.13[2]
Characteristics
Spectral type M4 V[3]
U−B color index 2.685[4]
B−V color index 1.59[5]
Variable type Flare star
Astrometry
Radial velocity (Rv) -31.0[6][7] km/s
Proper motion (μ) RA: 605.66[1] mas/yr
Dec.: -1219.32[1] mas/yr
Parallax (π) 299.59 ± 2.20[1] mas
Distance 10.89 ± 0.08 ly
(3.34 ± 0.02 pc)
Absolute magnitude (MV) 13.51[2]
Details
Mass 0.15[8] M☉
Radius 0.21[9] R☉
Surface gravity (log g) 3.40[8]
Luminosity 0.00029 L☉
Temperature 3,180[3] K
Other designations
FI Virginis, FI Vir, GCTP 2730, LHS 315, GJ 447, G 010-050, Vyssotsky 286, LTT 13240, LFT 852, HIP 57548.[1]

Ross 128 is a red dwarf star that is the eleventh closest star system to the Solar System, at a distance of 10.89 light years. It was first cataloged in 1926 by Frank Elmore Ross.[10]

This is an old disk star, which means it has a low metallicity and orbits near the plane of the Milky Way galaxy.[11] It is classified as an active flare star since it can undergo unpredictable and dramatic increases in luminosity for a period of several minutes.[12] Because of the low rate of flare activity, it is thought to be a magnetically evolved star. That is, there is some evidence that the magnetic braking of the star's stellar wind has lowered the frequency of flares, but not the net yield.[13]

On multiple occasions this star has been examined for the existence of a low stellar mass or brown dwarf companion orbiting at a distance of at least 1 astronomical unit from the primary. However, no companion have yet been discovered.[14][15] The star also lacks a strong excess of infrared radiation. An infrared excess is usually an indicator of a dust ring in orbit around the star.[16][17]

Ross 128 is orbiting through the Milky Way at a distance from the galactic core that varies from 8.22 to 10.49 kpc, and with an orbital eccentricity of 0.122.[18] This orbit will bring the star closer to the Solar System in the future. The nearest approach will occur in about 71,000 years, when it will come within 1.911 ± 0.026 parsecs.[7]

See also

References

  1. ^ a b c d e f Perryman, M. A. C. et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics 323: L49–L52, Bibcode 1997A&A...323L..49P 
  2. ^ a b "The One Hundred Nearest Star Systems". Research Consortium on Nearby Stars. 2009-01-01. http://www.chara.gsu.edu/RECONS/TOP100.posted.htm. Retrieved 2009-09-03. 
  3. ^ a b Gautier, T. N. et al. "Far Infrared Properties of M Dwarfs". Bulletin of the American Astronomical Society 36: 1431. Bibcode 2004AAS...205.5503G. 
  4. ^ Rufener, F. (October 1976). "Second catalogue of stars measured in the Geneva Observatory photometric system". Astronomy & Astrophysics Supplement Series 26: 275–351. Bibcode 1976A&AS...26..275R. 
  5. ^ Warren, W. H., Jr. (1978). "Photoelectric Photometric Catalogue of Homogeneous Means in the UBV System". Observatory (Geneva). 
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35493 Hipparcos Stars". http://cdsarc.u-strasbg.fr/viz-bin/Cat?cat=III%2F252&. Retrieved 2010-04-18. 
  7. ^ a b García-Sánchez, J.; Weissman, P. R.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; Latham, D. W.; Stefanik, R. P.; Paredes, J. M. (2001). "Stellar encounters with the solar system". Astronomy and Astrophysics 379 (2): 634–659. Bibcode 2001A&A...379..634G. doi:10.1051/0004-6361:20011330. 
  8. ^ a b Rodonò, Marcello. The Atmospheres of M Dwarfs: Observations. Washington: NASA. pp. 409–453. 
  9. ^ White, Stephen M.; Jackson, Peter D.; Kundu, Mukul R. (December 1989). "A VLA survey of nearby flare stars". Astrophysical Journal Supplement Series 71: 895–904. Bibcode 1989ApJS...71..895W. doi:10.1086/191401. 
  10. ^ Ross, Frank E. (1926). "New proper-motion stars, (second list)". Astronomical Journal 36 (856): 124–128. Bibcode 1926AJ.....36..124R. doi:10.1086/104699. 
  11. ^ Sánchez, F. (1990). Vazquez, M.. ed. New windows to the universe. 2. Cambridge University Press. p. 313. ISBN 052138429X. 
  12. ^ Kunkel, W. E. (July 29-August 4, 1974). "Solar neighborhood flare stars - A review". Variable stars and stellar evolution; Proceedings of the Symposium. Moscow, USSR: D. Reidel Publishing Co. pp. 15–46. Bibcode 1975IAUS...67...15K. 
  13. ^ Skumanich, Andrew (1986-10-15). "Some evidence on the evolution of the flare mechanism in dwarf stars". Astrophysical Journal, Part 1 309: 858–863. Bibcode 1986ApJ...309..858S. doi:10.1086/164654. 
  14. ^ Hinz, Joannah L.; McCarthy, Donald W., Jr.; Simons, Doug A.; Henry, Todd J.; Kirkpatrick, J. Davy; McGuire, Patrick C. (April 2002). "A Near-Infrared, Wide-Field, Proper-Motion Search for Brown Dwarfs". The Astronomical Journal 123 (4): 2027–2032. arXiv:astro-ph/0201140. Bibcode 2002AJ....123.2027H. doi:10.1086/339555. 
  15. ^ Schroeder, Daniel J.; Golimowski, David A.; Brukardt, Ryan A.; Burrows, Christopher J.; Caldwell, John J.; Fastie, William G.; Ford, Holland C.; Hesman, Brigette et al. (2000). "A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2". The Astronomical Journal 119 (2): 906–922. Bibcode 2000AJ....119..906S. doi:10.1086/301227. 
  16. ^ Jura, M. et al (September 2004). "Mid-Infrared Spectra of Dust Debris around Main-Sequence Stars". The Astrophysical Journal Supplement Series 154 (1): 453–457. arXiv:astro-ph/0405632. Bibcode 2004ApJS..154..453J. doi:10.1086/422975. 
  17. ^ Gautier, Thomas N., III et al (September 2007). "Far-Infrared Properties of M Dwarfs". The Astrophysical Journal 667 (1): 527–536. Bibcode 2007ApJ...667..527G. doi:10.1086/520667. 
  18. ^ Allen, C.; Herrera, M. A. (1998). "The galactic orbits of nearby UV Ceti stars". Revista Mexicana de Astronomia y Astrofisica 34: 37–46. Bibcode 1998RMxAA..34...37A. 

External links

Coordinates: 11h 47m 44.4s, +00° 48′ 16″

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