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Further Constraints on Thermal Quiescent X-ray Emission from SAX J1808.4-3658
C. O. Heinke, P. G. Jonker, R. Wijnands +2
We observed SAX J1808.4-3658 (1808), the first accreting millisecond pulsar, in deep quiescence with XMM-Newton and (near-simultaneously) Gemini-South. The X-ray spectrum of 1808 i…
Optical Observations of SAX J1808.4-3658 During Quiescence
C. J. Deloye, C. O. Heinke, R. E. Taam +1
We observed the accreting millisecond pulsar SAX J1808.4-3658 with Gemini-South in g' and i' bands, nearly simultaneous with XMM-Newton observations. A clear periodic flux modulati…
Common Envelope Mergers: A Possible Channel for Forming Single sdB Stars
Michael Politano, Ronald E. Taam, Marc van der Sluys +1
We quantify an evolutionary channel for single sdB stars based on mergers of binaries containing a red giant star and a lower mass main sequence or brown dwarf companion in our Gal…
On the Properties of Inner Cool Disks in the Hard State of Black Hole X-Ray Transient Systems
Ronald E. Taam, B. F. Liu, F. Meyer +1
The formation of a cool disk in the innermost regions of black hole X-ray transient systems in the low hard state is investigated. Taking into account the combined cooling associat…
The most massive progenitors of neutron stars: CXO J164710.2-455216
K. Belczynski, R. Taam
The evolution leading to the formation of a neutron star in the very young Westerlund 1 star cluster is investigated. The turnoff mass has been estimated to be 35 Msun, indicating…