I think I found the star that blew up on the DSS plates. It appears
very blue. I've attached a small crop of the red and blue images from
the DSS plates with an arrow pointing to my candidate.

The super slow Nova Delphinus 1967 discovered by that famous English
comet hunter George Alcock in July 8, 1967 was the slowest nova I've
ever watched. It was a 12th magnitude star before it blew. It was 6th
magnitude when discovered but didn't reach maximum until December 13
when it reached magnitude 3.5. It dropped after that but then rose to a
secondary maximum of magnitude 4.2 on May 5th, 1968, 10 months after its
discovery. It didn't fade from naked eye visibility until it vanished
into the sun at year end. It wasn't naked eye when Delphinus
reappeared. It still shines about magnitude 12 and is known as HR
Delphinus. It too is very blue on the DSS plates.

I've attached a shot of Nova Delphinus I took a full year after
discovery. I put tick marks around it. Notice no hint of an ionized
hydrogen shell like Nova Vulpecula has developed. Slow nova I've
photographed have either no such shell or fainter ones than fast nova.
I've not seen an explanation why. My sample size is small so that may
be the cause right there. The shot of Nova Delphinus was taken with a
135 mm lens on High Speed Ektachome film with the camera piggy back on
my 10" f/5 Cave. I no longer remember the time but it likely was about
1 minute as it was taken in town which quickly fogged photos much longer
than that.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

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