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Latest Stellar classification Stories

Brown Dwarf Weather Map Shows A Stormy Atmosphere
2013-01-09 08:38:22

redOrbit Staff & Wire Reports - Your Universe Online By using the Hubble and Spitzer space telescopes, NASA officials say they have managed to complete the most detailed weather map to date for the cool, planet-like stars known as brown dwarfs. Brown dwarfs, which are also sometimes known as failed stars, form out of condensing gas but do not have the mass in order to fuse hydrogen atoms and produce energy, officials from the US space agency explained in a recent statement. As a...

2011-08-23 15:19:00

WASHINGTON, Aug. 23, 2011 /PRNewswire-USNewswire/ -- Scientists using data from NASA's Wide-field Infrared Survey Explorer (WISE) have discovered the coldest class of star-like bodies, with temperatures as cool as the human body. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO ) Astronomers hunted these dark orbs, termed Y dwarfs, for more than a decade without success. When viewed with a visible-light telescope, they are nearly impossible to see. WISE's infrared vision...

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2010-11-23 08:00:00

An international team of astronomers have discovered a unique and exotic star system with a very cool methane-rich (or T-) dwarf star and a "Ëœdying' white dwarf stellar remnant in orbit around each other. The system is a "ËœRosetta Stone' for T-dwarf stars, giving scientists the first good handle on their mass and age. The team, led by Dr Avril Day-Jones of the Universidad de Chile and including Dr David Pinfield of the University of Hertfordshire as well as astronomers...

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2009-08-19 13:15:42

Data from NASA's Galaxy Evolution Explorer spacecraft may force astronomers to discard the assumption that stars of certain sizes form in certain quantities. For decades, astronomers have believed the proportion of small to big stars was fixed. For every star 20 or more times as massive as the sun, for example, there should be 500 stars with the sun's mass or less. But that belief, based on years of research, has been shattered with data from the spacecraft's ultraviolet telescope. That data...

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2008-12-12 12:45:00

Astronomy & Astrophysics is publishing spectroscopic observations with NASA's space-based Far-Ultraviolet Spectroscopic Explorer (FUSE) of the white dwarf KPD 0005+5106. The team of German and American astronomers who present these observations show that this white dwarf is among the hottest stars known so far, with a temperature of 200 000 K at its surface. It is so hot that its photosphere exhibits emission lines in the ultraviolet spectrum, a phenomenon that has never been seen before....

2008-07-09 15:00:22

By Kristin Edwards, The Huntsville Item, Texas Jul. 9--During the summer, specific constellations make prominent appearances in the night sky, and stars of various colors are more visible than at any other time during the year. For Huntsville residents, the summer months also provide a chance to learn more about those stars during special presentations at the Sam Houston State University planetarium. The presentations will include a seasonal film entitled "The Colors of Summer,"...

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2008-05-01 12:29:26

Discovery helps solve riddle of where the carbon white dwarfs come from, and what happens to their hydrogen and helium University of Texas at Austin astronomers Michael H. Montgomery and Kurtis A. Williams, along with graduate student Steven DeGennaro, have predicted and confirmed the existence of a new type of variable star, with the help of the 2.1-meter Otto Struve Telescope at McDonald Observatory. The discovery is announced in today's issue of Astrophysical Journal Letters. This research...

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2006-10-19 09:00:22

First Directly Imaged Brown Dwarf Companion to an Exoplanet Host Star Astronomers have detected a new faint companion to the star HD 3651, already known to host a planet. This companion, a brown dwarf, is the faintest known companion of an exoplanet host star imaged directly and one of the faintest T dwarfs detected in the Solar neighbourhood so far. The detection yields important information on the conditions under which planets form. "Such a system is an interesting example that might...

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2006-08-04 12:31:51

Using ESO's Very Large Telescope, astronomers have discovered a rather unusual system, in which two planet-size stars, of different colours, orbit each other. One is a rather hot white dwarf, weighing a little bit less than half as much as the Sun. The other is a much cooler, 55 Jupiter-masses brown dwarf. "Such a system must have had a very troubled history", said Pierre Maxted, lead author of the paper that reports the study in this week's issue of Nature. "Its existence proves that the...

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2005-04-18 18:45:00

A primitive star with extremely low iron content has been discovered by an international research team from Sweden, Japan, Germany, USA, Australia and Great Britain. This indicates the original composition of the gas from which the star formed had low iron content. The results are published in Nature online this week. In 2001, the giant star HE0107-5240 was discovered among a large number of stars examined as part of the Hamburg/ESO* survey. Detailed studies revealed that the star had by far...


Latest Stellar classification Reference Libraries

6_d67b2db586c7facec8388b5df78e57912
2004-10-19 04:45:42

Star -- A star is a self-gravitating sphere of plasma in hydrostatic equilibrium that generates energy in its interior through the process of nuclear fusion. Energy from this process radiates into space as electromagnetic radiation and neutrinos. Star formation and evolution As learned by star formation astronomers, stars are born in molecular clouds, regions of higher density of matter, and form by gravitational instability inside those clouds. High mass stars illuminate powerfully...

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2004-10-19 04:45:40

Vega -- Vega (Alpha Lyrae) is the lead star in the constellation Lyra, reaching near directly overhead the mid-northern latitudes, during the summer. It's a "nearby star" at only 25 light years distant and together with Arcturus and Sirius, one of the brightest stars in the Sun's neighbourhood. Vega is a vertex of the Summer Triangle. Its spectral class is A0V (Sirius, an A1V, is slightly less powerful) and it's firmly in the main sequence, fusing hydrogen to helium in its core....

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