THE MASS AND RADIUS OF THE NEUTRON STAR IN 4U 1820-30
Journal Article
·
· Astrophysical Journal
- University of Arizona, Department of Astronomy, 933 N. Cherry Ave., Tucson, AZ 85721 (United States)
We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 {+-} 0.06 M{sub sun} and the radius to be R = 9.1 {+-} 0.4 km.
- OSTI ID:
- 21457063
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 719; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
EXOSAT observations of double-peaked bursts with radius expansion from 4U/MXB 1820-30
DISCOVERY OF A 693.5 s PERIOD IN THE X-RAY BINARY 4U 1820 - 30: A SUPERHUMP INTERPRETATION
THE MASS AND THE RADIUS OF THE NEUTRON STAR IN THE TRANSIENT LOW-MASS X-RAY BINARY SAX J1748.9-2021
Journal Article
·
Sat Feb 28 23:00:00 EST 1987
· Astrophys. J.; (United States)
·
OSTI ID:6270153
DISCOVERY OF A 693.5 s PERIOD IN THE X-RAY BINARY 4U 1820 - 30: A SUPERHUMP INTERPRETATION
Journal Article
·
Sat Mar 20 00:00:00 EDT 2010
· Astrophysical Journal
·
OSTI ID:21394243
THE MASS AND THE RADIUS OF THE NEUTRON STAR IN THE TRANSIENT LOW-MASS X-RAY BINARY SAX J1748.9-2021
Journal Article
·
Thu Feb 28 23:00:00 EST 2013
· Astrophysical Journal Letters
·
OSTI ID:22130875