what are the secondary stars in CVs? back to top previous page next page

A. Mean density of      secondary star

B. Volume radius of Roche lobe

C. Kepler's third law

Combining A, B & C gives:

Most CVs have 1 < P < 10 h, resulting in 100 < 2 < 1 g cm-3.
Therefore, CV secondary stars should be main-sequence stars with spectral types ranging from early-G to late-M.