Open AccessComposite spectra Paper 8: HD 4615/6
Author(s) -
Griffin R. E. M.,
Griffin R. F.
Publication year - 1999
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.1365-8711.1999.02446.x
Subject(s) - physics , astrophysics , eccentricity (behavior) , spectral line , orbital elements , orbit (dynamics) , orbital eccentricity , rotation period , stars , orbital period , astronomy , engineering , political science , law , aerospace engineering
HD 4615/6 is a seventh‐magnitude composite‐spectrum binary system. It has an orbit of moderate eccentricity (0.43) and a period of 303 d. The system is of course unresolved at the telescope, but we are able to separate the spectra of the component stars and show that they are of types K2 III (HD 4615) and A2.5 V (HD 4616), with a mass ratio (giant:dwarf) of approximately 1.25. The orbital inclination is high, but there are no eclipses. The maximum apparent angular separation is expected to be about 0.009 arcsec. Neither star's rotation is synchronized with the orbital motion.