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LIGO-Virgo finds mystery object in gap between neutron stars and black holes（图）
LIGO-Virgo mystery object gap between neutro holes
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2020/7/3
When the most massive stars die, they collapse under their own gravity and leave behind black holes. When stars that are a bit less massive die, they explode in supernovas and leave behind dense, dead...
LIGO and Virgo make first detection of gravitational waves produced by colliding neutron stars（图）
LIGO Virgo first detection gravitational waves produced colliding neutron stars
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2017/10/26
For the first time, scientists have directly detected gravitational waves -- ripples in space-time -- in addition to light from the spectacular collision of two neutron stars. This marks the first tim...
First Observations Of Merging Neutron Stars Mark A New Era In Astronomy（图）
First Observations Merging Neutron Stars Mark New Era Astronomy
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2017/10/26
Two months ago, the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) notified astronomers around the world of the possible detection of gravitational waves from the merger of two ne...
RIT study suggests dying stars give newborn black holes a swift kick
RIT study dying stars newborn black holes swift kick
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2017/7/21
New information gleaned from gravitational wave observations is helping scientists understand what happens when massive stars die and transform into black holes.
Rochester Institute of Technology res...
Tsunami of Stars and Gas Produces Dazzling Eye-shaped Feature in Galaxy
Tsunami Stars Gas Dazzling Eye-shaped Galaxy
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2016/11/29
Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have discovered a tsunami of stars and gas that is crashing midway through the disk of a spiral galaxy known as IC 2163. This ...
Astronomers Peer Inside Stars,Finding Giant Magnets
Astronomers Peer Inside Stars Giant Magnets
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2015/11/12
Using a technique called asteroseismology, the scientists were able to calculate the magnetic field strengths in the fusion-powered hearts of dozens of red giants, stars that are evolved versions of o...
Neutron Stars Strike Back at Black Holes in Jet Contest
Neutron Stars Strike Back Black Holes Jet Contest
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2015/8/13
Some neutron stars may rival black holes in their ability to accelerate powerful jets of material to nearly the speed of light, astronomers using the Karl G. Jansky Very Large Array (VLA) have discove...
Existence of relativistic stars in f(T) gravity
Existence relativistic stars gravity
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2011/10/17
We examine the existence of relativistic stars in f(T) modified gravity and explicitly construct several classes of static perfect fluid solutions. We derive the conservation equation from the complet...
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. IV. Two bulge populations
Gravitational lensing: micro—Galaxy: bulge —Galaxy: formation —Galaxy: evolution —Stars: abundances
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2011/10/20
Based on high-resolution (R~42000 to 48000) and high signal-to-noise (S/N~50 to 150) spectra obtained with UVES/VLT, we present detailed elemental abundances (O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Zn...
Rotating Stars and Revolving Planets: Bayesian Exploration of the Pulsating Sky
Time series Poisson point processes Harmonic analysis Periodograms Experimental design Astronomy Pulsars Extrasolar planets
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2011/10/20
I describe ongoing work on development of Bayesian methods for exploring periodically varying phenomena in astronomy, addressing two classes of sources: pulsars, and extrasolar planets (exoplanets). F...
The peculiar properties of horizontal branch stars in omega Centauri
peculiar properties horizontal branch stars omega Centauri
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2011/10/20
We measured temperatures, gravities, and masses for a large sample of blue horizontal branch stars in omega Centauri, comparing the results with theoretical expectations for canonical and He-enriched ...
The cluster structure of the inner crust of neutron stars in the Hartree-Fock-Bogoliubov approach
cluster structure inner crust neutron stars approach
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2011/10/17
We analyse how the structure of the inner curst is influenced by the pairing correlations. The inner-crust matter, formed by nuclear clusters immersed in a superfluid neutron gas and ultra-relativisti...
Hybrid stars with the Dyson-Schwinger quark model
Hybrid stars Dyson-Schwinger quark model
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2011/10/18
We study the hadron-quark phase transition in the interior of neutron stars. For the hadronic sector we use a microscopic equation of state involving nucleons and hyperons derived within the Brueckner...
Elliptical motions of stars in close binary systems
Elliptical motions binary systems
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2011/1/10
Motions of stars in close binary systems with a conservative mass exchange are examined. It is shown that Paczynski-Huang model widely used now for obtaining the semi-major axis variation of a relativ...
Time-dependent Turbulence in Stars
Time-dependent Turbulence Stars
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2011/1/11
Three-dimensional (3D) hydrodynamic simulations of shell oxygen burning (Meakin and Arnett 2007) exhibit bursty, recurrent fluctuations in turbulent kinetic energy. These are shown to be due to a glob...