The remarkable hot R Coronae Borealis star DY Cen is revealed to be the first and only binary system to be found among the R Coronae Borealis (RCB) stars and their likely relatives, including the Extreme Helium stars and the hydrogen-deficient carbon stars. Radial velocity determinations from 1982-2010 have shown DY Cen is a single-lined spectroscopic binary in an eccentric orbit with a period of 39.67 days. It is also one of the hottest and most H-rich member of the class of RCB stars. The system may have evolved from a common-envelope to its current form.
Cite
@article{arxiv.1210.4199,
title = {The hot R Coronae Borealis star DY Centauri is a binary},
author = {N. Kameswara Rao and David L. Lambert and D. A. Garcia-Hernandez and C. Simon Jeffery and Vincent M. Woolf and Barbara McArthur},
journal= {arXiv preprint arXiv:1210.4199},
year = {2015}
}
Comments
Published in The Astrophysical Journal Letters; one missing reference has been added in order to fit the published version ApJ, 760, L3