Ο_Puppis
Omicron Puppis
Variable Star in the constellation Puppis
Omicron Puppis (ο Puppis) is candidate binary star[6] system in the southern constellation of Puppis. It is visible to the naked eye, having a combined apparent visual magnitude of +4.48.[2] Based upon an annual parallax shift of 2.30 mas as seen from Earth,[1] it is located roughly 1,400 light years from the Sun.
This is a suspected close spectroscopic binary system. The spectrum varies with a periodicity of 28.9 days, and a helium emission component shows a radial velocity variation that matches the period. The properties indicate it may be a φ Per-like system with a Be star primary and a hot subdwarf companion of type sdO. If this is the case, then the pair have a circular orbit with a period that matches the variability. The close-orbiting pair may have undergone interaction in the past, leaving the subdwarf stripped down and the primary star spinning rapidly.[6]
ο Puppis is slightly variable. The General Catalogue of Variable Stars lists it as a possible Be star with a magnitude range of 4.43 - 4.46.[11] The International Variable Star Index classifies it as a Lambda Eridani variable.[12]