|We are looking for Europeans of different nationalities that can speak about the refugee invasion in your country and how this REALLY is affecting you. Are you in Hungary, Greece, Germany, France, Italy, Austria or another country being heavily invaded? Please reach out: email@example.com or @rediceradio We want to speak with you!|
Betelgeuse: Ready to go Supernova?
The red supergiant Betelgeuse would extend to Jupiter if it were put in the sun's place in the solar system. A new study suggests it has shrunk by more than 15 per cent since 1993 (Image: A. Dupree/CFA/R. Gilliland/STScI/NASA/ESA)
Pinned prominently on Orion's shoulder, the bright red star Betelgeuse hardly seems like a wallflower. But a new study suggests the giant star has been shrinking for more than a decade.
Betelgeuse is nearing the end of its life as a red supergiant. The bright, bloated star is 15 to 20 times more massive than the sun. If it were placed at the centre of the solar system, the star would extend out to the orbit of Jupiter.
But the star's reach seems to be waning. New observations indicate the giant star has shrunk by more than 15 per cent since 1993. This could be a sign of a long-term oscillation in its size or the star's first death knells. Or it may just be an artefact of the star's bumpy surface, which may appear to change in size as the star rotates.
Betelgeuse is enshrouded by vast clouds of gas and dust, so measuring its size is difficult. To cut through this cocoon, Charles Townes of the University of California, Berkeley, and colleagues used a set of telescopes that are sensitive to a particular wavelength of the star's infrared light.
The team used these instruments to measure the size of Betelgeuse's disc on the sky. Over a span of 15 years, the star's diameter seems to have declined from 11.2 to 9.6 AU (1 AU, or astronomical unit, is the distance from the Earth to the sun).
The cause for this reduction is unknown, as it is unclear how red supergiants behave near the end of their lives.
"Maybe there's some instability in the star and it's going to collapse or at least go way down in size or blow off some material, but who knows," Townes, who shared a 1964 Nobel Prize for the invention of the laser, told reporters on Tuesday at a meeting of the American Astronomical Society in Pasadena, California.
The shrinking size could also be evidence of an as-yet-unidentified pulsation in the star, says Graham Harper of the University of Colorado in Boulder, who was not affiliated with the study.
The surface of Betelgeuse is known to wobble in and out, fed in part by the roiling energy of convection beneath its surface. Two such pulsations are already known – one seems to start anew each year, the other every 6 years. Since this observation shows a progressive decrease in the size of the star over 15 years with a consistent set of measurements, Harper says: "I think this is a very nice indication that [Betelgeuse] is getting smaller."
But he notes the change in size could be an illusion. Simulations suggest temperature differences in red supergiants can make their surfaces extraordinarily bumpy, causing the star to appear to be a different size when viewed from different angles.
"Often if you look at the simulations, the star is not spherical. It looks like a bad potato," Harper told New Scientist. Betelgeuse is thought to rotate every 18 years or so, which might suggest an especially narrow part of the star recently rotated into view.
Another possibility, Harper says, is that the team is not measuring the surface of the star but a layer of dense molecular gas that some astronomers suspect may hover above it.
The team hopes to get higher-resolution pictures of the star at a variety of wavelengths to determine the origin of the light they are seeing.
Seeing Red: Will Betelgeuse Go Supernova in 2012? (pdf)
Latest News from our Front Page
Finally, The CIA Admits Covering Up JFK Assassination
Suspicions that the CIA covered up JFK’s murder have finally been confirmed, according to an explosive Politico report out this week. Fifty-two years after the President’s death, declassified documents show that the CIA were in communication with alleged assassin Lee Harvey Oswald before JFK’s murder in 1963, and they were monitoring his mail since 1959.
Not only that but John McCone, who was Chief of the ...
More Great Media Moments in Muslim Achievement: Headscarf Lady Wins Bakeoff In Britain
Last month, America rejoiced when a 14-year-old Muslim lad in Irving, Texas discovered time, thus solving the universe’s ongoing problem that everything happens at once. This month, Britain is exulting that a Muslim lady can cook better than most Brits. From the New York Times:
Muslim Winner of Baking Contest Defies Prejudice in Britain
By Dan Bilefsky, OCT. 8, 2015
LONDON — Prime Minister ...
Israelis Declare Carrying Firearms Helpful in Preventing 'Lone Wolf' Attacks
In the wake of several “lone wolf” attacks, the Israeli government is encouraging citizens to carry personal firearms with them at all times while in public. The attacks have been conducted by Palestinians wielding nothing more than knives, but have struck terror into the heart of Israel.
During the attacks, which are being conducted in reprisal for a long series of ...
Russians drop leaflets on ISIS, implying America and Israel is behind them
Dire warning: The leaflets (pictured) being dropped by Russian jets warn people to get out of the zone of 'special operations' - and one implies that terror group al-Nusra Front are backed by America and Israel
Syrian army helicopters have dropped tens of thousands of leaflets on ISIS and rebel fighters, warning them to get out now and 'don't make it even ...
Europeâ€™s Rape Epidemic: Western Women Will Be Sacrificed At The Altar Of Mass Migration
Fast forward eight months or so, and I am living in a new flat with a female friend of mine. Late one night, while my friend and I were sitting talking in her room, someone let himself in. He immediately decided to take his trousers off and walk in to the bedroom with a stupid â€śentitledâ€ť grin on his face. ...
|More News » |