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Stellar tiramisu
07-07-2007 · EurekAlert!Looking at the chemical composition of stars that host planets, astronomers have found that while dwarf stars often show iron enrichment on their surface, giant stars do not. The astronomers think that the planetary debris falling onto the outer layer of the star produces a detectable effect in a dwarf star, but this pollution is diluted by the giant star and mixed into its interior.
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- Stellar Birth Control In The Early Universe
10-02-2006 · ScienceDaily
An international team of astronomers based at Yale and Leiden University in The Netherlands found that "old stars" dominated many large galaxies in the early universe, raising the new question of why these galaxies progressed into "adulthood" so early in the life of the universe. Their results imply that the galaxies have a method of "birth control" that is very effective.
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- X-ray satellites catch magnetar in gigantic stellar 'hiccup'
04-04-2007 · European Space Agency (ESA)
Astronomers using data from several X-ray satellites have caught a magnetar – the remnant of a massive star with an incredibly strong magnetic field – in a sort of giant cosmic blench.
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- Astronomers find stellar cradle where planets form
11-29-2007 · EurekAlert!
Astronomers at the University of Illinois have found the first clear evidence for a cradle in space where planets and moons form. The cradle, revealed in photographs taken with NASA's Spitzer Space Telescope, consists of a flattened envelope of gas and dust surrounding a young protostar.
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- Hubble yields direct proof of stellar sorting in a globular cluster
10-24-2006 · EurekAlert!
A seven-year study with the NASA/ESA Hubble Space Telescope has provided astronomers with the best observational evidence yet that globular clusters sort out stars according to their mass. Heavier stars slow down and sink to the cluster's core, while lighter stars pick up speed and move across the cluster to its periphery. This process, called "mass segregation," has long been suspected for globular star clusters, but has never before been directly seen in action.
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- Hubble finds multiple stellar 'baby booms' in a globular cluster
05-02-2007 · EurekAlert!
Analysis of Hubble observations of the massive globular cluster NGC 2808 provides evidence that it has three generations of stars that formed early in the cluster's life. This is a major upset for conventional theories as astronomers have long thought that globular star clusters had a single "baby boom" of stars early in their lives and then settled down into a long, quiet middle age.
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- Stellar Opposites: Sky survey reveals new halo of stars
12-15-2007 · Science News Online
The Milky Way galaxy possesses a distinct outer halo that orbits in the opposite direction from its inner halo and the rest of the galaxy.
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- Scientists crack open stellar evolution
10-26-2006 · EurekAlert!
Using 3-D models run on some of the fastest computers in the world, laboratory physicists have created a mathematical code that cracks a mystery surrounding stellar evolution.
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- NASA's Chandra sees brightest supernova ever
05-07-2007 · EurekAlert!
The brightest stellar explosion ever recorded may be a long-sought new type of supernova, according to observations by NASA's Chandra X-ray Observatory and ground-based optical telescopes. This discovery indicates that violent explosions of extremely massive stars were relatively common in the early universe, and that a similar explosion may be ready to go off in our own Galaxy.
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- White dwarf pulses like a pulsar
01-02-2008 · EurekAlert!
New observations from Suzaku, a joint Japanese Aerospace Exploration Agency NASA X-ray observatory, have challenged scientists' conventional understanding of white dwarfs. Observers had believed white dwarfs were inert stellar corpses that slowly cool and fade away, but the new data tell a completely different story.
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- No matter their size black holes 'feed' in the same way
12-06-2006 · EurekAlert!
Research by UK astronomers, published today in Nature (7th December 2006) reveals that the processes at work in black holes of all sizes are the same and that supermassive black holes are simply scaled up versions of small Galactic black holes.For many years astronomers have been trying to understand the similarities between stellar-mass sized Galactic black hole systems and the supermassive black holes in active galactic nuclei (AGN).
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