Open AccessMeasuring neutron star mass and radius with three mass–radius relations
Author(s) -
Zhang C. M.,
Yin H. X.,
Kojima Y.,
Chang H. K.,
Xu R. X.,
Li X. D.,
Zhang B.,
Kiziltan B.
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.11133.x
Subject(s) - physics , radius , neutron star , astrophysics , redshift , gravitational redshift , stellar mass , oscillation (cell signaling) , low mass , astronomy , gravitational wave , star formation , stars , galaxy , computer security , genetics , biology , computer science
We propose to determine the mass and radius of a neutron star (NS) using three measurable mass–radius relationships, namely the ‘apparent’ radius inferred from the NS thermal emission, the gravitational redshift inferred from the absorption lines, as well as the averaged stellar mass density inferred from the orbital Keplerian frequency derived from the kilohertz quasi‐periodic oscillation data. We apply the method to constrain the NS mass and radius of the X‐ray sources, 1E 1207.4−5209, Aql X‐1 and EXO 0748−676.