Journal Article

Mass and radius estimation for the neutron star in the X-ray burster 4U 1820−30

K. Kuśmierek, J. Madej and E. Kuulkers

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3344-3348
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18948.x
Mass and radius estimation for the neutron star in the X-ray burster 4U 1820−30

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We present a new method for determining masses and radii of neutron stars residing in thermonuclear X-ray burst sources. To illustrate this method, we apply it to a burst from the source 4U 1820−30 recorded by the Rossi X-Ray Timing Explorer. Fits of the observed X-ray spectra to grids of Comptonized model atmospheres yield estimates for the mass and radius of the neutron star, M= 1.3 ± 0.6 M and R= 11+3− 2 km, respectively.

Keywords: stars: individual: 4U 1820−30; stars: neutron; X-rays: bursts

Journal Article.  3267 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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