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Re: Yahoo! News Story - The Star That Everyone Missed - Yahoo! News

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  • mahtezcatpoc
    V598 Puppis http://listaarchivum.tapiomente.hu/?lista=mira&msg=6533 RA 7h05m42.7s Declination -38°14 42 27 Cancer 20. I think I ll call this Read-Saxton
    Message 1 of 3 , Jul 22, 2008
      V598 Puppis


      RA 7h05m42.7s
      Declination -38°14'42"

      27 Cancer 20.

      I think I'll call this Read-Saxton Star.

      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:
      > >
      > >
      > >
      > > The Star That Everyone Missed - Yahoo! News
      > >
      > >
      > >
      > The Star That Everyone Missed
      > Space.com Staff
      > SPACE.com Tue Jul 22, 7:02 AM ET
      > An orbiting X-ray observatory has discovered an exploding star in the
      > Milky Way which somehow escaped notice by the usual crowd of star
      > Calculations show that the star's sudden brightness was clearly
      > visible to the naked eye, but no one reported anything until the
      > European Space Agency's XMM-Newton telescope spotted an unexpected
      > burst of cosmic X-rays.
      > On Oct. 9, 2007, XMM-Newton was turning from one target to another
      > when it passed across a bright source of X-rays that no one was
      > expecting. The source was not listed in any previous X-ray catalog,
      > yet the mysterious object was lighting up XMM-Newton's view of the
      > The XMM-Newton team looked up three possible celestial candidates as
      > at this location, including a normally faint star known only by its
      > catalog number USNO-A2.0 0450-03360039. Acting quickly, Andy Read of
      > the University of Leicester and Richard Saxton of ESA's European Space
      > Astronomy Centre (ESAC), Spain, e-mailed other astronomers about the
      > newly-discovered X-ray source.
      > More sleuthing
      > Astronomers turned to the 6.5-meter Magellan-Clay telescope at Las
      > Campanas Observatory in Chile, and found that USNO-A2.0 0450-03360039
      > had become 600 times brighter than normal. Analyzing the light from
      > the source meant that they could classify the object as a nova.
      > Novae occur when a small, compact star, called a white dwarf, feeds
      > off the gas of a nearby companion star. Gas builds up on the white
      > dwarf until a nuclear reaction begins releasing large quantities of
      > energy, causing the white dwarf to explode in brightness.
      > That led to a puzzle. An explosion of this type does not immediately
      > release X-rays, because the expanding cloud of debris created in the
      > detonation temporarily masks them. That meant the explosion must have
      > taken place many days before XMM-Newton spotted the X-ray burst,
      > although no one reported seeing it.
      > Amateur and professional astronomers usually find novae by regularly
      > sweeping the night sky for stars or other objects that suddenly
      > brighten — but humans are not alone in watching the sky. Saxton
      > contacted the robotic All Sky Automated Survey project and asked
      > astronomers to check their data. They found the nova had taken place
      > on June 5, 2007, and had been clearly visible, and that it would have
      > been bright enough to see with the unaided eye. "Anyone who went
      > outside that night and looked towards the constellation of Puppis
      > would have seen it," Saxton says.
      > Still tracking The nova has now received the official name of V598
      > Puppis and has become one of the brightest for almost a decade,
      > despite not getting spotted during its brilliant peak. As news of its
      > existence spread, the global effort to track its fading light became
      > intense.
      > "Suddenly there was all this data being collected about the star,"
      > Read says. "For variable star work like this, the contribution of the
      > amateur community can be at least as important as that from the
      > professionals."
      > This story has a happy ending thanks to XMM-Newton, which has covered
      > 30 percent of the sky and documented 7,700 X-ray sources. However, the
      > event does make astronomers wonder whether there are other discoveries
      > going unnoticed.
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