Open AccessComposite spectraPaper 9: HR 5983
Author(s) -
Griffin R. E. M.,
Griffin R. F.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03088.x
Subject(s) - physics , astrophysics , spectral line , composite number , orbit (dynamics) , helium , circular orbit , mass ratio , astronomy , loop (graph theory) , atomic physics , materials science , composite material , mathematics , combinatorics , engineering , aerospace engineering
HR 5983 is a sixth‐magnitude composite‐spectrum binary system. It has a circular orbit and a period of 108 d. We separate the component spectra and show that they are of types ∼G6 IIIa and A2.5 IV, with a mass ratio (giant:dwarf) of ∼1.04. We find that the secondary has a mass close to 2.6 M ⊙ and has already evolved somewhat from the main sequence, and that the primary appears to have reached the helium‐burning ‘blue loop’ stage and is in synchronous rotation. The system resembles Capella in several respects, and may represent an earlier phase in the evolution of the latter.