The Full Wiki

More info on Zeta Herculis

Zeta Herculis: Wikis

Advertisements
  

Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.

Encyclopedia

From Wikipedia, the free encyclopedia

Zeta Herculis A/B
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 16h 41m 17.16s
Declination +31° 36′ 09.8″
Apparent magnitude (V) 2.89
Characteristics
Spectral type G0 IV/K0 V
U-B color index 0.21
B-V color index 0.64
Variable type Suspected
Astrometry
Radial velocity (Rv) -69.9 km/s
Proper motion (μ) RA: -462.64 mas/yr
Dec.: 345.08 mas/yr
Parallax (π) 92.64 ± 0.60 mas
Distance 35.2 ± 0.2 ly
(10.79 ± 0.07 pc)
Absolute magnitude (MV) 2.72
Details
Mass 1.5/0.85 M
Radius 2.5/0.92 R
Luminosity 6/0.65 L
Temperature 5780/5420 K
Metallicity ? % Sun
Rotation <10 km/s.
Age 3.8 × 109 years
Other designations
ζ Her, 40 Her, 40 Herculis, GJ 635, HR 6212, BD +31°2884, HD 150680, LHS 3234, LTT 14952, GCTP 3799.00, SAO 65485, NSV 07915, WDS 16413+3136, HIP 81693.

Zeta Herculis (ζ Her, ζ Herculis) is a binary star system in the constellation Hercules. The primary star is a sub-giant that is somewhat larger than the Sun and has just begun to evolve away from the main sequence. It is orbited by a smaller and fainter star that is separated from the primary by just over 1 arcsec. The stars orbit each other with a period of 34.5 years and a semi-major axis of 1.36". Stars A & B are separated from each other by an average separation of 14.65 AUs and swing as close as 8 AUs and as far away as 21.3 AUs.

This system forms part of the Zeta Herculis moving group of stars. This group includes: δ Trianguli, φ2 Pavonis, ζ Reticuli, 1 Hydrae, Gl 456, Gl 678, and Gl 9079.[1]

References

  1. ^ G. F. Porto de Mello, L. da Silva (1991). "On the physical existence of the Zeta HER moving group - A detailed analysis of Phi exp 2 Pavonis". Astronomical Journal 102: 1816–1825. doi:10.1086/116006. http://adsabs.harvard.edu/abs/1991AJ....102.1816P. 

External links

Advertisements

Advertisements






Got something to say? Make a comment.
Your name
Your email address
Message