[vsnet-chat 1738] Re: PR Her

[Jan Manek <jmanek@mbox.vol.cz>]

At 11:51 26.3.1999 -0700, Brian Skiff wrote:
>     The Digitized Sky Survey in the north shows the POSS-I red plates.
>As far as I know scans of the POSS-II are not publicly available.  The
>"second-generation" scans one can get through the STScI server (but not
>Goddard's SkyView) are merely the POSS-I plates scanned at 15-micron pitch
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I'm not sure about this statement. If I look at the header of FITS files from STScI server then 'first' generation scans have date of observation around 1952, while 'second' generation scans around 1990 (for the sample of about 10 FITS files I have just now on the disk). So they don't differ only by resolution of scans.

>instead of 25 microns.  As a rough guess, based on the usual limits of the
>POSS-I plates, PR Per has R ~19.5 at the time of the POSS-I exposure, and
>thus presumably somewhat fainter in B.  It is almost certainly more readily
>visible on the POSS-II film copies, but given that it really isn't "lost"
>I haven't looked for it on them.

Jan

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Jan Manek
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