From: LARRY KLAES (ljk4_at_msn.com)
Date: Wed Jan 03 2007 - 07:56:19 PST
Astrophysics, abstract
astro-ph/0701002
From: M. Virginia McSwain [view email]
Date: Fri, 29 Dec 2006 21:28:50 GMT (112kb)
Runaway Massive Binaries and Cluster Ejection Scenarios
Authors: M. Virginia McSwain, Scott M. Ransom, Tabetha S. Boyajian, Erika D.
Grundstrom, Mallory S. E. Roberts
Comments: Accepted to ApJ, 11 pages
The production of runaway massive binaries offers key insights into the
evolution of close binary stars and open clusters. The stars HD 14633 and HD
15137 are rare examples of such runaway systems, and in this work we
investigate the mechanism by which they were ejected from their parent open
cluster, NGC 654. We discuss observational characteristics that can be used
to distinguish supernova ejected systems from those ejected by dynamical
interactions, and we present the results of a new radio pulsar search of
these systems as well as estimates of their predicted X-ray flux assuming
that each binary contains a compact object. Since neither pulsars nor X-ray
emission are observed in these systems, we cannot conclude that these
binaries contain compact companions. We also consider whether they may have
been ejected by dynamical interactions in the dense environment where they
formed, and our simulations of four-body interactions suggest that a
dynamical origin is possible but unlikely. We recommend further X-ray
observations that will conclusively identify whether HD 14633 or HD 15137
contain neutron stars.
http://arxiv.org/abs/astro-ph/0701002
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