Loading ...
Sorry, an error occurred while loading the content.

Re: Yahoo! News Story - Sun's Wayward Twin Discovered - Yahoo! News

Expand Messages
  • mahtezcatpoc
    HIP 56948 (Draconis) In Draco, near Giansar (Lambda Draconis) in the Dragon s head. 11h 40m 28.483s +69°00 30.605 (epoch 2000) 12 Leo 36. Mark A. Holmes ...
    Message 1 of 3 , Nov 11, 2007
    • 0 Attachment
      HIP 56948 (Draconis)

      In Draco, near Giansar (Lambda Draconis) in the Dragon's head.

      11h 40m 28.483s
      +69°00'30.605" (epoch 2000)


      12 Leo 36.


      Mark A. Holmes


      >
      > --- In thefixedstars@yahoogroups.com, Mark Andrew Holmes
      > <mahtezcatpoc@> wrote:
      > >
      > >
      > > Mark Andrew Holmes (mahtezcatpoc@) has sent you a news article.
      > > (Email address has not been verified.)
      > > ------------------------------------------------------------
      > > Personal message:
      > >
      > >
      > >
      > > Sun's Wayward Twin Discovered - Yahoo! News
      > >
      > >
      >
      http://news.yahoo.com/s/space/20071109/sc_space/sunswaywardtwindiscovered
      >
      >
      > BLGD.
      >
      > Mark A. Holmes
      >
      >
      > Begin story.--
      >
      >
      >
      > Sun's Wayward Twin Discovered
      >
      > Dave Mosher
      > Staff Writer
      > SPACE.com Fri Nov 9, 3:00 PM ET
      >
      > Somewhere out there, astronomers knew the sun had another long-lost
      > relative aimlessly drifting through the Milky Way. Now they've found it.
      >
      >
      > Although a happy reunion is unlikely, as the star HIP 56948 is about
      > 200 light-years away, it is now considered to be the best "solar twin"
      > out of four known candidates.
      >
      > The wayward star challenges the idea that our backyard star has a
      > unique composition, as it has a similarly low quantity of the element
      > lithium--a lightweight byproduct of the fusion reactions that power
      stars.
      >
      > Astronomers Jorge Melendez of the Australian National University and
      > Ivan Ramirez of the University of Texas at Austin discovered the new
      > star with a telescope at the McDonald Observatory in Texas. The
      > mid-sized star is one of many in the Draco the dragon constellation
      > and may be a billion years older than the sun, which is middle-aged at
      > 4.6 billion years.
      >
      > Three other solar twins were previously proposed: 18 Scorpius, HD
      > 98618 and HIP 100963. While similar to the sun in many ways,
      > spectrographic analysis revealed that their lithium contents are
      > dramatically higher.
      >
      > Because of those observations, astronomers wondered if the sun's low
      > amount of lithium was unique. The newfound twin now shows that it isn't.
      >
      > Searches for solar twins are important, the astronomers said, because
      > the sun is used as a baseline for many other types of studies. But our
      > own solar power plant is too close and too bright to study like
      > distant stars.
      >
      > The solar twins discovered at McDonald should help astronomers study
      > the chemical compositions of stars and back theoretical models of our
      > sun's stellar insides and evolution with real observations.
      >
      >
      > --End story.
      >
    Your message has been successfully submitted and would be delivered to recipients shortly.