High-Resolution Spectroscopy of Ultracompact Binaries

Details High-Resolution Spectroscopy of Ultracompact Binaries High-Resolution Spectroscopy of Ultracompact Binaries

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..17j&link_type=abstract

X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held

Computer Science

Actively Accreting And Transient Binaries

Scientific paper

Observational evidence suggests that >10% of all known low-mass X-ray binaries have orbital periods shorter than 1 hour. These so-called ultracompact binaries require hydrogen-deficient or degenerate companions, usually assumed to be He white dwarfs. However, the Chandra spectrum of the ultracompact binary 4U 1626-67 revealed O and Ne emission and absorption features which led the authors to conclude that the donor is a carbon-oxygen WD. Unusual implied abundances from neutral absorption edges have also been found in 4 candidate ultracompact systems. I will present an overview of the Chandra and XMM-Newton spectral results from the known and candidate ultracompact binaries. In addition, I will address the implications of recent results on the nature of the companions in these systems and the formation of ultracompact binaries.

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