HR Aurigae - an active binary?

Charles G. Loomis, Edward G. Schmidt
1989 Astrophysical Journal  
Photometric and spectral observations of the variable star HR Aurigae are presented. Based on these data we conclude that this star, previously regarded as a type I1 Cepheid, is, in fact, an active binary.
doi:10.1086/185612 fatcat:n4s5gw3kobbz3p4abxrridi3em