scholarly journals [ITAL]Hubble Space Telescope[/ITAL] Detection of a Quiescent Low-Mass X-Ray Binary Companion in 47 Tucanae

2002 ◽  
Vol 564 (1) ◽  
pp. L17-L20 ◽  
Author(s):  
Peter D. Edmonds ◽  
Craig O. Heinke ◽  
Jonathan E. Grindlay ◽  
Ronald L. Gilliland
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
X Ray ◽  
Low Mass

scholarly journals Hubble Space Telescope Observations of Millisecond Pulsar Companions: Constraints on Evolution

1996 ◽  
Vol 160 ◽  
pp. 497-500 ◽  
Author(s):  
S. C. Lundgren ◽  
R. S. Foster ◽  
F. Camilo
Keyword(s):  
White Dwarfs ◽  
Hubble Space Telescope ◽  
Core Mass ◽  
Space Telescope ◽  
X Ray ◽  
Current Period ◽  
Accretion Rates ◽  
Order Of Magnitude ◽  
Low Mass ◽  
The Masses

AbstractIn observations of six binary millisecond pulsars with the Hubble Space Telescope, we have discovered white dwarf companions to PSRs J0034-0534, J1022+1001, J1713+0747, and J2019+2425 and improved photometry on PSRs J1640+2224 and J2145-0750. Three of the white dwarfs are among the coolest and oldest known. We have determined that the masses for the helium companions are consistent with the expectation based on the core mass of a progenitor that filled its Roche lobe. The cooling times for many of the white dwarfs are much less than the characteristic spin-down times, implying that the spin period at the end of the accretion stage was close to the current period. The initial spin periods calculated are used to place limits on the accretion rate at the end of the low-mass X-ray binary phase. The accretion rates are found to be over an order of magnitude less than the Eddington rate.

scholarly journals UV and X-ray observations of the neutron star LMXB EXO 0748–676 in its quiescent state

2020 ◽  
Vol 501 (1) ◽  
pp. 1453-1462
Author(s):  
A S Parikh ◽  
N Degenaar ◽  
J V Hernández Santisteban ◽  
R Wijnands ◽  
I Psaradaki ◽  
...  
Keyword(s):  
Neutron Star ◽  
Thermal Emission ◽  
Hubble Space Telescope ◽  
Dense Matter ◽  
Continuum Emission ◽  
Quiescent State ◽  
X Ray ◽  
Low Level ◽  
Low Mass ◽  
Different Origins

ABSTRACT The accretion behaviour in low-mass X-ray binaries (LMXBs) at low luminosities, especially at <1034 erg s−1, is not well known. This is an important regime to study to obtain a complete understanding of the accretion process in LMXBs, and to determine if systems that host neutron stars with accretion-heated crusts can be used probe the physics of dense matter (which requires their quiescent thermal emission to be uncontaminated by residual accretion). Here, we examine ultraviolet (UV) and X-ray data obtained when EXO 0748–676, a crust-cooling source, was in quiescence. Our Hubble Space Telescope spectroscopy observations do not detect the far-UV continuum emission, but do reveal one strong emission line, C iv. The line is relatively broad (≳3500 km s−1), which could indicate that it results from an outflow such as a pulsar wind. By studying several epochs of X-ray and near-UV data obtained with XMM–Newton, we find no clear indication that the emission in the two wavebands is connected. Moreover, the luminosity ratio of LX/LUV ≳ 100 is much higher than that observed from neutron star LMXBs that exhibit low-level accretion in quiescence. Taken together, this suggests that the UV and X-ray emission of EXO 0748–676 may have different origins, and that thermal emission from crust-cooling of the neutron star, rather than ongoing low-level accretion, may be dominating the observed quiescent X-ray flux evolution of this LMXB.

scholarly journals Study of Hubble Space Telescope counterparts to Chandra X-ray sources in the globular cluster M 71

2010 ◽  
Vol 513 ◽  
pp. A16 ◽  
Author(s):  
R. H. H. Huang ◽  
W. Becker ◽  
P. D. Edmonds ◽  
R. F. Elsner ◽  
C. O. Heinke ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
X Ray

HUBBLE SPACE TELESCOPE MONITORING REVEALS A 6.1 DAY PERIOD FOR AN ULTRALUMINOUS X-RAY SOURCE IN NGC 1313

2008 ◽  
Vol 690 (1) ◽  
pp. L39-L42 ◽  
Author(s):  
Jifeng Liu ◽  
Joel N. Bregman ◽  
Jeffrey E. McClintock
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
X Ray
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