white dwarfs/ white-dwarf populationGalactic halomicrolensing eventmassive compact halo objectMACHO projectGalaxygaseous-stellar systemMicrolensing events detected in the MACHO project are sometimes interpreted as evidence for the presence of a rich population of white dwarfs in the halo of the Galaxy, ...
We examine the various formation scenarios and conclude that the substellar object was most likely captured by the white dwarf progenitor early in the life of the cluster, rather than forming in situ. 展开 关键词: binaries: close brown dwarfs white dwarfs ...
If the mass transfer in LMXBs is driven by nuclear evolution of the donor star, the final orbital period is predicted to be well correlated with the mass of the white dwarf (WD), which is the degenerate He core of the donor. Here we show that this relation can be extended to very ...
In an alternative formation channel, NSs are produced via the accretion-induced collapse (AIC) of a massive white dwarf (WD) in a close binary. Aims. Here we investigate binary evolution leading to AIC and examine if NSs formed in this way can subsequently be recycled to form MSPs and, ...
LOW-MASS X-RAY BINARIES INDICATE A TOP-HEAVY STELLAR INITIAL MASS FUNCTION IN ULTRACOMPACT DWARF GALAXIES It has been shown before that the high mass-to-light ratios of ultracompact dwarf galaxies (UCDs) can be explained if their stellar initial mass function (... J Dabringhausen,P Kroupa,J...
The solid white line represents a Stokes number of unity (which is proportional to the gas surface density), while cyan and red show the fragmentation and drift barrier, respectively Full size image The dust density distribution at four different times of evolution of these simulations are shown ...
We present the first detailed study of the properties (temperatures, gravities, and masses) of the NGC 6791 white dwarf population. This unique stellar system is both one of the oldest (8 Gyr) and most metal-rich ([Fe/H] ~ +0.4) open clusters in our Galaxy and has a color-magnitude ...
The fine-grained phase-space structure of cold dark matter haloes. Mon. Not. R. Astron. Soc. 385, 236–254 (2008). ADS Google Scholar Vogelsberger, M. & White, S. D. M. Streams and caustics: the fine-grained structure of Λ cold dark matter haloes. Mon. Not. R. Astron. Soc....
Unless case (3) can produce collapse, the number of systems that lead to low-field short-period neutron stars, similar to the known msec pulsars, is small. 展开 关键词: classical and quantum mechanics, general physics pulsars star evolution white dwarf stars angular momentum star accretion ...
These are exciting times for binary black holes (BBHs). LIGO and Virgo detections are progressively drawing a spectacular fresco of BBH masses, spins, and merger rates. In this review, we discuss the main formation channels of BBHs from stellar evolution