Accuracy of Mass and Radius Determination for Neutron Stars in X-ray Bursters from Simulated LOFT Spectra

• Autorzy: Majczyna A. , Madej J. , Różańska A. , Należyty M.

Identyfikatory

DOI

10.32023/0001-5237/67.2.5

• Języki publikacji: EN

Abstrakty

EN

We present a simulation of an X-ray spectrum of a hot neutron star, as would be seen by the LAD detector on board of LOFT satellite. We also compute a grid of theoretical spectra corresponding to a range of effective temperatures Teff and surface gravities log g with values corresponding to compact stars in Type I X-ray bursters. A neutron star with the mass M=1.64 ,M☉ and the radius R=11.95 km (which yields the surface gravity log g=14.30 [cgs] and the surface redshift z=0.30) is used in simulation. Accuracy of mass and radius determination by fitting theoretical spectra to the observed one is found to be M=1.64^+0.16_-0.02 M☉ and R=11.95^+1.57_-0.40 km (2σ). The confidence contours for these two variables are narrow but elongated, and therefore the resulting constraints on the EOS cannot be strong. Note, that in this paper we aim to discuss error contours of NS mass and radius, whereas discussion of EOS is beyond the scope of this work.

Słowa kluczowe

EN

stars: neutron; X-rays: bursts; space vehicles: instruments

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2017
• Tom: Vol. 67, No. 2
• Strony: 171--180
• Opis fizyczny: Bibliogr. 35 poz., rys., tab., wykr.

Twórcy

autor

Majczyna A.

• National Centre for Nuclear Research, ul. Andrzeja Sołtana 7, 05-400 Otwock, Poland

autor

Madej J.

• Astronomical Observatory University of Warsaw, Al. Ujazdowskie 4,

autor

Różańska A.

• Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Należyty M.

• Astronomical Observatory University of Warsaw, Al. Ujazdowskie 4,

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).