Gliese 268

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Gliese 268
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  07h 10m 01.83458s[1]
Declination 38° 31′ 46.0672″[1]
Characteristics
Spectral type M5Ve + M5Ve[2]
U−B color index +1.18[3]
B−V color index +1.71[3]
Variable type RS CVn
Astrometry
Radial velocity (Rv)41.792 ± 0.025[4] km/s
Proper motion (μ) RA: -437.44[1] mas/yr
Dec.: -947.44[1] mas/yr
Parallax (π)158.88 ± 0.72[4] mas
Distance20.53 ± 0.09 ly
(6.29 ± 0.03 pc)
Orbit[4]
Period (P)10.42672 ± 0.00006 d
Semi-major axis (a)0.1110 ± 0.0005″
Eccentricity (e)0.3203 ± 0.0009
Inclination (i)100.39 ± 0.03°
Longitude of the node (Ω)89.98 ± 0.07°
Argument of periastron (ω)
(secondary)
211.98 ± 0.19°
Semi-amplitude (K1)
(primary)
34.814 ± 0.036 km/s
Semi-amplitude (K2)
(secondary)
40.874 ± 0.052 km/s
Details[4]
Gliese 268 A
Mass0.22599(65) M
Gliese 268 B
Mass0.19248(56) M
Other designations
QY Aur, GJ 268, HIP 34603, G 87-26, G 07-51, LFT 512, LHS 226, LTT 11987, Ross 986, TYC 2944-1956-1[2]
Database references
SIMBADdata
ARICNSdata

Gliese 268 (QY Aurigae) is a RS Canum Venaticorum variable (RS CVn) star in the Auriga constellation. RS CVn variables are binary star systems with a strong magnetic field influenced by each star's rotation, which is accelerated by the tidal effects of the other star in the system.[5] Gliese 268 in particular is composed of a binary system of two M-type dwarfs, or red dwarfs, and is one of the one hundred closest star systems to the Earth; the primary component of the system has an apparent magnitude of 12.05, and the secondary component an apparent magnitude of 12.45.[citation needed] Neither is visible to the naked eye from Earth.[6]

References[edit]

  1. ^ a b c d Perryman; et al. (1997). "HIP 34603". The Hipparcos and Tycho Catalogues.
  2. ^ a b "V* QY Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 March 2015.
  3. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
  4. ^ a b c d Barry, R. K.; Demory, B.-O.; Ségransan, D.; Forveille, T.; Danchi, W. C.; Di Folco, E.; Queloz, D.; Spooner, H. R.; Torres, G.; Traub, W. A.; Delfosse, X.; Mayor, M.; Perrier, C.; Udry, S. (2012). "A Precise Physical Orbit for the M-Dwarf Binary Gliese 268". The Astrophysical Journal. 760: 55. Bibcode:2012ApJ...760...55B. doi:10.1088/0004-637X/760/1/55. hdl:2060/20130013663.
  5. ^ "RS CVn Stars". Karl Schwarzschild Observatory. Retrieved 26 August 2011.
  6. ^ "The 100 Nearest Star Systems". Research Consortium on Nearby Stars. Georgia State University. 1 January 2011. Retrieved 26 August 2011.