Journal
ASTROPHYSICAL JOURNAL
Volume 752, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/752/2/158
Keywords
stars: neutron; X-rays: binaries; X-rays: bursts; X-rays: individual (MXB 1730-335)
Categories
Funding
- MICINN [AYA2011-23102, FIS2011-24439, AYA2010-15685]
- Government of Catalonia [2008SGR-1251, 2009SGR-1002]
- ESF EUROCORES Program EuroGENESIS [EUI2009-04167]
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The Rapid Burster (MXB 1730-335) is a unique object, showing both type I and type II X-ray bursts. A type I burst of the Rapid Burster was observed with Swift/X-Ray Telescope on 2009 March 5, showing photospheric radius expansion (PRE) for the first time in this source. We report here on the mass and radius determination from this PRE burst using a Bayesian approach. After marginalization over the likely distance of the system (5.8-10 kpc), we obtain M = 1.1 +/- 0.3 M-circle dot and R = 9.6 +/- 1.5 km (1 sigma uncertainties) for the compact object, ruling out the stiffest equations of state for the neutron star. We study the sensitivity of the results to the distance, the color correction factor, and the hydrogen mass fraction in the envelope. We find that only the distance plays a crucial role.
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