vega

Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr, α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky and the second-brightest star in the northern celestial hemisphere, after Arcturus. It is relatively close at only 25 light-years from the Sun, and, together with Arcturus and Sirius, one of the most luminous stars in the Sun's neighborhood.
Vega has been extensively studied by astronomers, leading it to be termed “arguably the next most important star in the sky after the Sun.” Vega was the northern pole star around 12,000 BC and will be so again around the year 13,727 when the declination will be +86°14'. Vega was the first star other than the Sun to be photographed and the first to have its spectrum recorded. It was one of the first stars whose distance was estimated through parallax measurements. Vega has served as the baseline for calibrating the photometric brightness scale, and was one of the stars used to define the mean values for the UBV photometric system.
Vega is only about a tenth of the age of the Sun, but since it is 2.1 times as massive its expected lifetime is also one tenth of that of the Sun; both stars are at present approaching the midpoint of their life expectancies. Vega has an unusually low abundance of the elements with a higher atomic number than that of helium. Vega is also a variable star that varies slightly in brightness. It is rotating rapidly with a velocity of 274 km/s at the equator. This is causing the equator to bulge outward because of centrifugal effects, and, as a result, there is a variation of temperature across the star's photosphere that reaches a maximum at the poles. From Earth, Vega is being observed from the direction of one of these poles.
Based on an observed excess emission of infrared radiation, Vega appears to have a circumstellar disk of dust. This dust is likely to be the result of collisions between objects in an orbiting debris disk, which is analogous to the Kuiper belt in the Solar System. Stars that display an infrared excess because of dust emission are termed Vega-like stars.

View More On Wikipedia.org
  1. W

    For Sale NiPoGi AM02 Mini PC AMD Athlon 300U Vega 3 Graphics 8GB RAM 128GB SSD

    NiPoGi AM02 Mini PC AMD Athlon 300U Vega 3 Graphics 8GB RAM 128GB SSD Neat little mini PC with Displayport and HDMI connections. 300U APU is Freesync compatible. RAM is in dual channel mode. RAM and SSD both upgradable. Comes fully boxed with power supply and VESA bracket. Looking for £150...
  2. Atomic77

    Question What is Radeon Vega Graphics.

    I just noticed my laptop I just got not to long ago has Radeon Vega Graphics along with the Ryzen 5 3500U CPU. so what exactally are Radeon Vega Graphics???
  3. redz

    Speaker Upgrade form Cerwin Vega

    Im looking to upgrade/swap out my Beloved Cerwin Vega es12 speakers. They are used in both stereo and for home cinema but even though i love them they are a bit too big/look old in black ash finish. What would you all recommend looking at as a replacement. I know they aren't a speaker for all...
  4. S

    AMD Vega conundrum

    Hi - I was wondering if anyone out there has a Vega card and what they think? I have a Freesync ultra-wide monitor (3440x1440) powered by an oldish AMD 290x which is getting to be quite old now. I was holding off for Vega.... and holding ... and holding and now that they are here they don't...
  5. Synchro

    Sapphire Radeon RX VEGA 64 8GB HBM2

    Just ordered one through Overclockers. Its late to the market. It should have been available at the end of last year, so I've been waiting for this to come out for some time. Anyway, glad its here now and can't wait to get it installed.
  6. LuvCVs

    Question Cerwin Vega CLSC 15 DAMAGE

    Hi, Just wanted to ask a quick question on a set of these speakers as I can get a pair but with serious cabin damage. Both will need to have new veneer, 6 deep areas of wood have been ripped out. Used they are worth maybe £800, but this damage, how much do you think they would be worth? Both...
  7. redz

    Replacement for Cerwin Vega e312 speakers

    So, following on from my post about re-foaming my woofers in my beloved Cerwin Vega speakers, aim struggling to get any genuine parts and awaiting a last response before deciding that i may need to replace the speakers. What would people recommend as suitable replacements for both music and av...
Back
Top Bottom