High Mass Triple Systems: The Classical Cepheid Y Car

Details High Mass Triple Systems: The Classical Cepheid Y Car High Mass Triple Systems: The Classical Cepheid Y Car

2005-04-07

arxiv.org/abs/astro-ph/0504169v1

Astron.J.130:789-793,2005

Astronomy and Astrophysics

Astrophysics

accepted by AJ

Scientific paper

10.1086/430458

We have obtained an HST STIS ultraviolet high dispersion Echelle mode spectrum the binary companion of the double mode classical Cepheid Y Car. The velocity measured for the hot companion from this spectrum is very different from reasonable predictions for binary motion, implying that the companion is itself a short period binary. The measured velocity changed by 7 km/ s during the 4 days between two segments of the observation confirming this interpretation. We summarize "binary" Cepheids which are in fact members of triple system and find at least 44% are triples. The summary of information on Cepheids with orbits makes it likely that the fraction is under-estimated.

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