Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-05-10
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Talk presented at Champery, Switzerland on 9 February 2011. To appear in Proceedings of Science
Scientific paper
X-ray burst spectra have long been used to estimate neutron star masses and radii. These estimates assumed that burst spectra are accurately described by the model atmosphere spectra developed over the last three decades. We compared RXTE data from a superburst with these spectra and found that the spectra predicted by previously published model atmospheres are strongly inconsistent with these high-precision measurements. In contrast, a simple Bose-Einstein spectrum is fully consistent with the data, as are recently published model atmosphere spectra. We discuss the implications of our results for determinations of neutron star masses and radii via constraints on their surface gravity and redshift, as originally suggested by Majczyna and Madej.
Boutloukos Stratos
Lamb Frederick K.
Lo Kin-Hing
Miller Michael Coleman
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