Search
Now showing items 1-9 of 9
A Hydrogen Atmosphere Spectral Model Applied to the Neutron Star X7 in the Globular Cluster 47 Tucanae
(American Astronomical Society, 2006)
Current X-ray missions are providing high-quality X-ray spectra from neutron stars ( NSs) in quiescent low-mass X-ray binaries ( qLMXBs). This has motivated us to calculate new hydrogen atmosphere models, including opacity ...
A Two‐Zone Model for Type I X‐Ray Bursts on Accreting Neutron Stars
(American Astronomical Society, 2006)
We construct a two-zone model to describe hydrogen and helium burning on an accreting neutron star and use it to study the triggering of type I X-ray bursts. Although highly simplified, the model reproduces all of the ...
The Rates of Type I X‐Ray Bursts from Transients Observed withRXTE: Evidence for Black Hole Event Horizons
(American Astronomical Society, 2006)
We measure the rates of type I X-ray bursts from a likely flux-limited sample of 37 nonpulsing Galactic transients observed with RXTE during 1996-2004. These sources are well categorized in the literature as either neutron ...
On the Physics of Type I X-Ray Bursts on Accreting Neutron Stars at High Accretion Rates
(American Astronomical Society, 2006)
We investigate the effect of the hot CNO cycle breakout reaction O-15(alpha, gamma)Ne-19 on the occurrence of type I X-ray bursts on accreting neutron stars. For f(rp) less than or similar to 0.1 where f(rp) is a dimensionless ...
The Spin of the Near‐Extreme Kerr Black Hole GRS 1915+105
(American Astronomical Society, 2006)
Based on a spectral analysis of the X-ray continuum that employs a fully relativistic accretion disk model, we conclude that the compact primary of the binary X-ray source GRS 1915+105 is a rapidly rotating Kerr black hole. ...
How Much Mass Do Supermassive Black Holes Eat in Their Old Age?
(American Astronomical Society, 2006)
We consider the distribution of local supermassive black hole Eddington ratios and accretion rates, accounting for the dependence of radiative efficiency and bolometric corrections on the accretion rate. We find that black ...
Growth of hydrodynamic perturbations in accretion disks: Possible route to non-magnetic turbulence
(Elsevier, 2006)
We study the possible origin of hydrodynamic turbulence in cold accretion disks such as those in star-forming systems and quiescent cataclysmic variables. As these systems are expected to have neutral gas, the turbulent ...
Oscillations of Starless Cores
(American Astronomical Society, 2006)
If the split, asymmetric molecular spectral line profiles that are seen in many starless cores are interpreted as indicative of global collapse or expansion of the core, then one possible implication is that most starless ...
On the production and survival of carbon fuel for superbursts on accreting neutron stars : Implications for mass donor evolution
(American Astronomical Society, 2006)