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arxiv: 1301.0831 · v1 · pith:WOPOX7JYnew · submitted 2013-01-04 · 🌌 astro-ph.HE

The mass and the radius of the neutron star in the transient low mass X-ray binary SAX J1748.9-2021

Tolga Guver , Feryal Ozel This is my paper
classification 🌌 astro-ph.HE
keywords massneutronstarj1748radiusx-raybinarybursts
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We use time resolved spectroscopy of thermonuclear X-ray bursts observed from SAX J1748.9-2021 to infer the mass and the radius of the neutron star in the binary. Four X-ray bursts observed from the source with RXTE enable us to measure the angular size and the Eddington limit on the neutron star surface. Combined with a distance measurement to the globular cluster NGC 6440, in which SAX J1748.9-2021 resides, we obtain two solutions for the neutron star radius and mass, R = 8.18 +/- 1.62 km and M = 1.78 +/- 0.3 M_\sun or R = 10.93 +/- 2.09 km and M = 1.33 +/- 0.33 M_\sun.

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