Latest Variable star Stories

2007-08-04 14:10:00

VLTI Snapshots Dusty Puff Around Variable Star Using ESO's Very Large Telescope Interferometer, astronomers from France and Brazil have detected a huge cloud of dust around a star. This observation is further evidence for the theory that such stellar puffs are the cause of the repeated extreme dimming of the star. R Coronae Borealis stars are supergiants exhibiting erratic variability. Named after the first star that showed such behaviour [1], they are more than 50 times larger than our Sun....

2006-02-28 09:00:51

ESO -- Using ESO's Very Large Telescope Interferometer (VLTI) at Cerro Paranal, Chile, and the CHARA Interferometer at Mount Wilson, California, a team of French and North American astronomers has discovered envelopes around three Cepheids, including the Pole star. This is the first time that matter is found surrounding members of this important class of rare and very luminous stars whose luminosity varies in a very regular way. Cepheids play a crucial role in cosmology, being one of the...

2006-01-09 17:20:00

WASHINGTON (Reuters) - The Hubble Space Telescope has captured the first image of a cosmic object that has been known but never before seen: a small, faint companion of the North Star. While the image released on Monday may not seem spectacular -- it's a little blurry blob beside the big star -- it helped scientists figure out the North Star's mass. "This is the final piece of the jigsaw puzzle which will let us get the most prized piece of information about a star, that is, its mass," said...

2006-01-09 08:40:00

NASA -- We tend to think of the North Star, Polaris, as a steady, solitary point of light that guided sailors in ages past. But there is more to the North Star than meets the eye. The North Star is actually a triple star system. And while one companion can be seen easily through small telescopes, the other hugs Polaris so tightly that it has never been seen "“ until now. By stretching the capabilities of NASA's Hubble Space Telescope to the limit, astronomers have photographed the...

2005-08-27 09:50:00

AAVSO -- Amateur astronomers are being asked to help a constellation of observatories unravel the mysteries of a puzzling binary star system. On August 30-August 31, 2005 two space-based and four professional ground-based observatories are scheduled to observe the cataclysmic variable star AE Aqr. Each of the observatories covers a different wavelength of light and amateur astronomers have been asked to help cover the visible-light portion. "This observing campaign will take place over...

Latest Variable star Reference Libraries

2004-10-19 04:45:43

Variable Star -- Most stars are of nearly constant luminosity. Our own Sun is a good example which goes through practically no measurable variation in brightness. There are, however, stars which do vary in brightness, called variable stars. They fall into two main groups: Intrinsic variables These are stars which have intrinsic variations in brightness, that is the star itself gets brighter and dimmer. There are many types of intrinsic variables, the main types being: -- Mira...

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Word of the Day
  • The unit of magnetic flux density in the International System of Units, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second. It is equivalent to one weber per square meter.
This word is named for Nikola Tesla, the inventor, engineer, and futurist.