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Old 20-10-2010, 09:43 AM
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CraigS
Unpredictable

CraigS is offline
 
Join Date: Jul 2010
Location: Australia
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Quote:
Originally Posted by bojan View Post
Good point. However...
A question from me now (I am now in Alex's mode ).
Instead of expected onion-shape [BTW, layers of light for millisecond pulsating are expected to be very thin (1 ms equals ~300km), object this small are not observable],we should be able to see some sort of bright ring, where rotating beam is hitting the shell of previously ejected material from a progenitor star.
Would the bright rings observed at SN 1987A in LMC be a good explanation for this?





This is also a question/point for Alex: 300km = 1ms.
The size of millisecond relaxation oscillator can not be larger than 300km in diameter.
I tried to put this bug in his ear earlier. but he didn't react, so now I am more direct - millisecond pulsar simply MUST be a VERY compact object in astronomical terms, whatever it's nature may be.
Rotating neutron star with two beams is (again) much more plausible model, contrary to relaxation oscillator explanation which is just an interesting mind game played by bored (or frustrated) electronics engineers.
The duration of the pulse (~1ms) is a function of the circuit tuning parameters. The physical size/geometry of the components, whilst related, doesn't directly correlate with the pulse duration. I'm not clear on what you're saying here.

Can you explain ?

Cheers
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