White dwarves

What would Procyon B and Sirius B look like for nearby observers?

The masses are well-known (about 0,98 solar masses for Sirius B, 0,6
solar masses for Procyon B), the sizes are also pretty exactly known
(Sirius B is the smaller, just slightly smaller than Earth). Both
orbit main sequence stars on eccentric orbits of similar size. Both
receive less light from A component than Earth from Sun, even at
closest approach. Sirius B is about 120 millions of years old, and
has temperature of 25 000 Celsius. Procyon B is older (under 1700
million years, but how much less?) and colder (at 7700 Celsius, just
slightly hotter than Sun).

Can anyone give more numbers about rotation rates and magnetic field
strengths of Sirius B and Procyon B?

What would an old white dwarf look like, assuming age of the white
dwarf between 4 and 10 milliards of years? Any guesses as to
temperature, rotation rate, magnetic field?

Shut up, innumerate cretin: http://groups.google.com/group/rec.a...2737cfb5610220.

Any guesses as to
temperature, rotation rate, magnetic field?

It depends on origial star. You can calculate it from loss of angular
momentum.

On Mar 26, 7:18 am, "Autymn D. C." wrote:
Shut up, innumerate

Illiterate?

No, the troll actually meant innumerate, although IMHO the OP doesn't
classify.

Maybe the troll read this book:

http://en.wikipedia.org/wiki/Innumeracy_%28book%29

and had a beer or two.

I remember my first beer.

== John ==

"Raghar" wrote:
On Mar 26, 7:18 am, "Autymn D. C." wrote:
Shut up, innumerate

Illiterate?

Raghar kirjutas:
Any guesses as to
temperature, rotation rate, magnetic field?

It depends on origial star.

We were not around to observe original Sirius B, Procyon B or Keid B.

You can calculate it from loss of angular
momentum.

But you cannot predict the said loss even if you do observe an
original star.

John D. Gwinner wrote:

I remember my first beer.

When I was seventeen,
I had a very good beer,
I had a very good beer, that I bought,
with a fake ID,
The name was Brian McGee,
I stayed up listening to Queen,
When I was seventeen.

Paul

wrote:
Can anyone give more numbers about rotation rates and magnetic field
strengths of Sirius B and Procyon B?

I doubt these are known, but you could try an ADS search or look for
references in SIMBAD.

What would an old white dwarf look like, assuming age of the white
dwarf between 4 and 10 milliards of years? Any guesses as to
temperature, rotation rate, magnetic field?

Temperature gradually decreases with time. Try an ADS search on
"white dwarf cooling curve." Rotation rates and magnetic fields will
be harder to find out, though some white dwarfs (note preferred
plural) are highly magnetized.