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EvC Forum ⇒ Science Forums ⇒ Big Bang and Cosmology ⇒

small M type

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Author Topic:   small M type
Sunny
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Sunny Posts Only
Message 1 of 2 (96184)
03-30-2004 10:16 PM

can somebody help me with this...
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Suppose a small M type (mass less than 0.1 solar masses) is orbiting an invisible object in space. The radius of the orbit is 2 AU, the period is 2 years.
How massive is the invisible object?
Could it be a burned out white dwarf star?
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thanks!!
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[This message has been edited by sunny, 03-30-2004]
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 Message 2 by Eta_Carinae, posted 03-31-2004 12:38 AM Sunny has not replied
  
Eta_Carinae
Member (Idle past 4396 days)
Posts: 547
From: US
Joined: 11-15-2003

Eta_Carinae Posts Only
Message 2 of 2 (96208)
03-31-2004 12:38 AM 		Reply to: Message 1 by Sunny
03-30-2004 10:16 PM

No - it cannot be a white dwarf.
I get that the total mass of both objects is exactly 2 solar masses. Therefore since the mass of the M dwarf is less than 0.1 solar masses this implies the invisible object is greater than 1.9 solar masses.
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Thus it is way over the Chandrsekhar limit and thus cannot be a white dwarf.
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[This message has been edited by Eta_Carinae, 03-31-2004]
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