EFFECTS OF SPOT SIZE ON NEUTRON-STAR RADIUS MEASUREMENTS FROM PULSE PROFILES

被引：19

作者：

Bauboeck, Michi ^{[1
]}

Psaltis, Dimitrios ^{[1
]}

Oezel, Feryal ^{[1
]}

机构：

[1] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 811卷 / 02期

基金：

美国国家科学基金会;

关键词：

gravitation; relativistic processes; stars: neutron; X-RAY-EMISSION; LIGHT CURVES; MILLISECOND OSCILLATIONS; MASSES; BURST; UNCERTAINTIES; PROPAGATION; EQUATION; MODEL;

D O I：

10.1088/0004-637X/811/2/144

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the effects of spot size on pulse profiles of moderately rotating neutron stars. Specifically, we quantify the bias introduced in radius measurements from the common assumption that spots are infinitesimally small. We find that this assumption is reasonable for spots smaller than 10 degrees-18 degrees and leads to errors that are <= 10% in the radius measurement, depending on the location of the spot and the inclination of the observer. We consider the implications of our results for neutron star radius measurements with the upcoming and planned X-ray missions NICER and LOFT. We calculate the expected spot size for different classes of sources and investigate the circumstances under which the assumption of a small spot is justified.

引用

页数：8

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