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btschumy
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 09/02/2022 - 15:17
In the AAVSO Target Tool, there are often stars that have values like:
17.0 p 12.5 p
for the min and max magnitude. What does "p" mean in this context? I can't find it in any of the standard photometric systems.
p stands for "photographic".
These values usually come from old photographic plates and are close to the Johnson's B passband.
Then you will find that these ranges are usually a couple of magnitudes fainter than visual for red variables.
Cheers,
Sebastian
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btschumy
Affiliation
American Association of Variable Star Observers (AAVSO)
Hi Bill,
p stands for "photographic".
These values usually come from old photographic plates and are close to the Johnson's B passband.
Then you will find that these ranges are usually a couple of magnitudes fainter than visual for red variables.
Cheers,
Sebastian
Thanks for the…
Sebastian,
Thanks for the info. Make sense.
Bill