Assertion: nova's companion star | /r/CapableOf | orbit p cygni
Facets:
Source sentences:
text: It has been proposed P Cygni's eruptions could be caused by mass transfer to a hypothetical companion star of spectral type B that would have a mass between 3 and 6 times the mass of the Sun and would orbit P Cygni each 7 years in a high eccentricity orbit.