Spectral analysis of the burst source 4U 1728-34

A. Majczyna; J. Madej; M. Należyty

doi:10.1117/12.2000239

7 November 2012 Spectral analysis of the burst source 4U 1728-34

A. Majczyna, J. Madej, M. Należyty

Proceedings Volume 8454, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2012; 84540B (2012) https://doi.org/10.1117/12.2000239
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2012, 2012, Wilga, Poland

Abstract

We analyse burst of MXB 1728-34 obtained by the RXTE PCA instrument during the observational period from 1995 to 2005. Each spectrum was integrated over 0.25 second and was fitted to the extensive grid of atmospheric models after background subtraction. Theoretical model spectra were calculated by the ATM code for various chemical compositions, effective temperatures from 10⁷ K to 3×10⁷ K and surface gravities from critical gravity up to log g = 15.0 (cgs units). As the result of the fitting procedure we obtained the surface redshift z and the surface gravity log g simultaneously for each trial set of parameters. Therefore, we are able to calculate mass and radius of the neutron star in MXB 1728-34. Many satisfactory fits were obtained for each chemical composition, but for models with iron abundance 100 times greater than the solar value fits were better than others. For this chemical composition we recommend that mass and radius of the neutron star is in the range: M = 0.103 – 1.564 M_ʘ and R = 1.745 – 10.620 km.

Citation Download Citation

A. Majczyna, J. Madej, and M. Należyty "Spectral analysis of the burst source 4U 1728-34", Proc. SPIE 8454, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2012, 84540B (7 November 2012); https://doi.org/10.1117/12.2000239

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KEYWORDS

Atmospheric modeling

Stars

Iron

Chemical analysis

Hydrogen

Principal component analysis

X-rays

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