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Codes
Bewarse Legend
Username: Codes
Post Number: 51687
Registered: 05-2006
Posted From: 212.60.115.186
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, January 08, 2010 - 8:45 am: |
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Blazewada:"soon" in the press announcement meant that "At the accretion rate we derived, the white dwarf in T Pyxidis will reach the Chandrasekhar Limit in ten million years."
apati variki akkaraledu.. dani kante munde ayipotundi..
Evil requires the sanction of the victim!
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Sunnymoon
Bewarse Legend
Username: Sunnymoon
Post Number: 10147
Registered: 06-2005
Posted From: 76.181.232.190
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, January 08, 2010 - 8:41 am: |
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ivala idhi eenadu lo chadivanu
Posting from US
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Blazewada
Celebrity Bewarse
Username: Blazewada
Post Number: 7016
Registered: 08-2008
Posted From: 117.197.208.37
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, January 08, 2010 - 7:51 am: |
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T Pyxidis is a binary star system in the constellation Pyxis at about 3260 light years from Earth. It contains a sun-like star and a white dwarf. Because of the strong gravity effect of the white dwarf, it draws matter from the other star which causes periodic thermonuclear explosions (so-called novae) to occur.
The usual apparent magnitude of this star system is 15.5, but there occurred eruptions with maximal apparent magnitude of about 7.0 in the years 1890, 1902, 1920, 1944 and 1966. Evidence seems to indicate that T Pyxidis has only increased in mass despite the nova eruptions, and is now close to the Chandrasekhar limit.[1] When a white dwarf reaches this limit it will collapse under its own weight and cause a Type 1a supernova. However, when contacted by Scientific American, Dr Sion said that the term "soon" in the press announcement meant that "At the accretion rate we derived, the white dwarf in T Pyxidis will reach the Chandrasekhar Limit in ten million years."[2] By that time it will have moved far enough away from the solar system to have little effect.
Because of its relatively close distance, some contend that a T Pyxidis supernova could have a significant impact on Earth. The received gamma radiation would equal the total (all spectra) radiation of approximately 1000 solar flares, and would severely damage the ozone layer.  The X-radiation that reaches Earth, however, would be less than the X-radiation of a single average solar flare[3]. However, Dr. Sion's calculations were challenged by Prof. Alex Fillipenko who said that Sion had possibly miscalculated the damage that could be caused by a T Pyxidis supernova. He had used data for a far more deadly gamma-ray burst (GRB) exploding 3,260 light-years from Earth, not a supernova, and T Pyxidis certainly isn't expected to produce a GRB. According to an another expert, "A supernova would have to be 10 times closer [to Earth] to do the damage described."
Posting from Andhra... 
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