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Legend for Light Curves

K2CHA
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Joined: 2013-08-17

I'm a bit confused about the legend on the Light Curves. What are the "V Validated", "B Prevalidated" and "U Prevalidated" items?


Thank you!

Jeremy

legend for light curves
HQA
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Joined: 2010-05-10

Hi Jeremy,

"validated" means a human looked at the datapoint and considered it a good estimate rather than a discrepant one.  "prevalidated" means the submission passed a series of checks by the computer during the process, so most of the gross errors were eliminated.  The "U" "B" "V" are the passbands.

We used to validate all visual data for the AAVSO program stars, but the return on investment was small.  A few percent of incoming observations had problems, and we inserted logic checks in the software to take care of the majority of those.  We still "validate" data for interesting objects (such as the new nova), and there is a tool called Zapper that you can download to highlight discrepant observations so that the AAVSO staff can investigate them further.  However, since we are then just looking at individual datapoints rather than long stretches of light curve, we don't mark any observations as "validated" any more.

Arne

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484