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From: allan@noao.UUCP
Newsgroups: net.astro.expert
Subject: Re: neutron stars, black holes, etc. (less long)
Message-ID: <342@noao.UUCP>
Date: Tue, 22-May-84 12:08:48 EDT
Article-I.D.: noao.342
Posted: Tue May 22 12:08:48 1984
Date-Received: Wed, 23-May-84 09:05:26 EDT
References: <303@utastro.UUCP>
Organization: Natl. Optical Astronomy Obs.  Tucson AZ USA
Lines: 10

I stand corrected about rotation being the only way of producing a stable
frequency of pulsation. However, the difference between pulsars and the 
ZZ Ceti stars is that pulsars give strong radio pulses, not optical pulses.
While I agree that optical pulses can be produced by non rotational methods,
radio pulses are much more difficult.


Peter (theories to go) Allan
Kitt Peak National Observatory
Tucson, Az