A firm upper limit to the radius of the neutron star in SAX J1808.4-3658

Authors
Burderi, L King, AR
Citation
L. Burderi et Ar. King, A firm upper limit to the radius of the neutron star in SAX J1808.4-3658, ASTROPHYS J, 505(2), 1998, pp. L135-L137
Citations number
12
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
505
Issue
2
Year of publication
1998
Part
2
Pages
L135 - L137
Database
ISI
SICI code
0004-637X(19981001)505:2<L135:AFULTT>2.0.ZU;2-C
Abstract
We show that observations of X-ray pulsing from SAX J1808.4-3658 place a fi rm upper limit of 13.8m(1/3) km on the radius of the neutron star, where m is its mass in solar units. The Limit is independent of distance, or assump tions about the magnetospheric geometry, and could be significantly tighten ed by observations of the pulsations in the near future. We discuss the imp lications for the equation of state and the possible neutron star mass.