High Mass Triple Systems: The Classical Cepheid Y Car

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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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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/196788

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/0504169
 http://arxiv.org/abs/astro-ph/0504169
 Astron.J.130:789-793,2005
 doi:10.1086/430458

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arXiv