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Latest Stellar astronomy Stories

Currie Celestial Body_010914
2014-01-09 15:42:28

John P. Millis, PhD for redOrbit.com - Your Universe Online One of the more interesting questions in astronomy surrounds how solar system objects actually form. Astronomers are particularly concerned about the boundary between a planet and a star. When examining the objects in our own solar neighborhood, the question seems trivial – the Sun dominates the mass of our system, while even the largest planet, Jupiter, is dwarfed by comparison. In other parts of the galaxy, stars exist that...

Storms As Big As Jupiter's 'Great Red Spot' Found On Brown Dwarfs
2014-01-07 11:57:11

[ Watch the Video: Torrential Storm Clouds On Brown Dwarfs ] Lee Rannals for redOrbit.com - Your Universe Online Most brown dwarfs may contain storms as big as Jupiter’s “Great Red Spot,” according to findings presented at the American Astronomical Society in Washington. Brown dwarfs are a form of star, but lack the mass to fuse atoms continually to turn themselves into a full-fledged star. The celestial bodies are like a cross between a Jupiter-sized gas planet and a star....

Discovery Helps Explain Binary Systems
2013-12-31 14:59:55

Lee Rannals for redOrbit.com - Your Universe Online Astronomers using the Very Large Array (VLA) have made a discovery that helps explain how double-star systems form. Half of all sun-like stars are part of double or multiple-star systems, and scientists have long debated over how these systems form. The latest discovery of previously-unseen binary companions to a pair of young protostars lends strong support for one of these explanations. "The only way to resolve the debate is to...

Astronomers Search For Cause Of Massive Star Formation
2013-12-21 04:25:12

redOrbit Staff & Wire Reports - Your Universe Online In an attempt to determine why massive stars – those with at least eight times the mass of our Sun – grow so much larger than most other stars in our galaxy, astronomers used the ALMA telescope to examine the cores of Infrared Dark Clouds roughly 10,000 light-years away. Infrared Dark Clouds are located in the direction of the constellations of Aquila and Scutum, and they are among the darkest, densest and coldest clouds in...

massive Star forming cluster discovered
2013-12-16 15:57:27

Lee Rannals for redOrbit.com - Your Universe Online Astronomers using the Smithsonian's Submillimeter Array (SMA) have discovered a giant star-forming region. Known as W49A, the region is located 36,000 light-years away from Earth on the opposite side of the Milky Way. Astronomers say the star-forming region shines 100 times brighter than the Orion nebula. In order to view W49A, astronomers had to aim SMA through dusty fog, after which the telescope helped reveal an active site of star...

Where Brown Dwarfs End And Stars Begin
2013-12-15 04:37:49

John P. Millis, Ph.D. for redOrbit.com - Your Universe Online Stars form as interstellar gas accumulates, increasing in density and temperature. Eventually, the environment at the core of the object reaches a state where hydrogen begins fusing at a high enough rate that the outward radiation pressure and the inward gravitational force reach a balance, and a star is born. However, if the forming proto-star is not quite massive enough, the fusion process is not able to produce enough...

Explosive Milky Way Protostar Reveals Details About Star Formation
2013-12-04 14:04:38

Brett Smith for redOrbit.com - Your Universe Online Using the Atacama Large Millimeter Array (ALMA) telescope in northern Chile, scientists have identified a very young star in our galaxy which had such an explosive birth, it used to be about 100 times brighter than it is now, according to a new study in Astrophysical Journal Letters. The study, from astrophysicists at the Niels Bohr Institute and the Centre for Star and Planet Formation at the University of Copenhagen in Denmark, has...

Spectacular Stellar Landscape Painted With Young Stars
2013-11-13 13:50:28

[ Watch The Video: Zooming in on the Star Cluster NGC 3572 ] ESO Astronomers at ESO have captured the best image so far of the curious clouds around the star cluster NGC 3572. This new image shows how these clouds of gas and dust have been sculpted into whimsical bubbles, arcs and the odd features known as elephant trunks by the stellar winds flowing from this gathering of hot young stars. The brightest of these cluster stars are much heavier than the Sun and will end their short...

Throes Of Stellar Birth Revealed As Never Before
2013-11-12 04:04:45

April Flowers for redOrbit.com - Your Universe Online The bubbly birth of a bouncing baby star has been revealed by observations from NASA's Spitzer Space Telescope and the newly completed Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. For the well-studied object known as HH 46/47, the observations have revealed the mechanisms of stellar birth as never before seen. HH, or Herbig-Haro, objects form when jets pushed out by newborn stars collide with material surrounding...

Giant Gas Cloud Magnetic Shield Milky Way
2013-11-01 10:13:00

redOrbit Staff & Wire Reports - Your Universe Online Astronomers have discovered a magnetic field deep within the Smith Cloud’s interior that may protect the giant galactic streamer of hydrogen gas during its projected collision with the Milky Way galaxy. The discovery, which was made using the Karl G. Jansky Very Large Array (VLA) and Robert C. Byrd Green Bank Telescope (GBT), could help explain how so-called high velocity clouds (HVCs) remain mostly intact during their mergers with...


Latest Stellar astronomy Reference Libraries

Stellar Astrophysics
2014-01-12 00:00:00

The prominent feature that allows for the existence of life on Earth is the Sun. Radiation from our closest star provides heat and energy to our planet, driving biological processes and providing the necessary conditions for liquid water to naturally exist. But our Sun is only but one star in this vast Universe. And as it turns out, most stars are quite different than the one that illuminates our day. For this reason, scientists have, for hundreds of years, attempted to study the other...

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2004-10-19 04:45:43

Hertzsprung-Russell Diagram -- In stellar astronomy, the Hertzsprung-Russell diagram (H-R diagram) shows the relation between the absolute magnitude and the spectral types of stars. It was invented around 1910 by Ejnar Hertzsprung and Henry Norris Russell. There are two equivalent forms. One is the observer's form which plots the color of the star on one axis and the absolute magnitude on the other axis. The theoretician's form plots the temperature of the star on one axis and the...

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2004-10-19 04:45:42

Stellar Evolution -- Stellar evolution is the process of formation, life, and death of stars. It is one of the major topics of cosmogony. Star Birth and Life A star starts out as an enormous cloud of gas and dust many light-years across. Star formation begins when the cloud begins to condense under its own gravity. The processes that initiate this contraction are not fully understood. The cloud fragments fuse into stellar mass clouds known as protostars. Protostars do not emit...

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2004-10-19 04:45:42

Star Formation -- Star formation is the process by which gas in molecular clouds gets transformed into stars. In the current paradigm of star formation, cores of molecular clouds (regions of specially high density) became gravitationally unstable, and start to concentrate. Part of the gravitational energy lost in the process is radiated in the infrared, another part increases the temperature of the core. The accretion of material happen partially though a circumstellar disc. When...

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2004-10-19 04:45:42

Star Designation -- The International Astronomical Union (IAU) is the internationally recognised authority for assigning designations to stars (and other celestial bodies). Many of the star names in use today were inherited from the time before the IAU existed. Other names, mainly for variable stars (including novae and supernovae), are being added all the time. Most stars, however, have no name and are referred to, if at all, by means of catalogue numbers. This article briefly...

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