Re: Why is Sirius B hotter than Sirius A?
- From: Llanzlan Klazmon <Klazmon@xxxxxxxxxxxxxxxx>
- Date: 15 Apr 2005 09:39:59 +1200
"me" <me@xxxxxx> wrote in
news:sbt7e.42742$mV1.21719@xxxxxxxxxxxxxxxxxxxxxxxxx:
> Hi
>
> Sirius B, a white dwarf, has a surface temperature of around 25,000
> degrees C. Sirius A, a blue/white main sequence star has a surface
> temperature of around 12,000 degrees C. Usually the bluer a star is,
> the hotter it is. Just wondered why it's not the case here.
>
>
>
The term white dwarf is just a name to distinguish from red dwarf. The
spectra of Sirius B versus A is just as expected by the surface
temperature difference. Note that white dwarf's are slowly cooling down
as they have no internal source of energy production.
K.
.
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