PDM extracting epoch at minimum light
Gautham Narayan wrote on May 23, 2006
Hi,
I'd like to use PDM to fold a light curve to a known period and extract the epoch at minimum light - hitting the a key gives me an epoch - is this the epoch at 0 phase? Is there some other way given a sparsely sampled light curve and a known period to extract the epoch at minimum light. Thanks.
I'd like to use PDM to fold a light curve to a known period and extract the epoch at minimum light - hitting the a key gives me an epoch - is this the epoch at 0 phase? Is there some other way given a sparsely sampled light curve and a known period to extract the epoch at minimum light. Thanks.
Mike Fitzpatrick wrote on May 23, 2006
The epoch returned by the 'a' key is simply the x-axis value of the extreme point in the curve, it is not fit at all to find a more precise value (the amplitude is the
(max-min) value in the data). I'm not aware of any other tasks that will do this but you might check the list of external packages for ideas (i.e. http://iraf.net/article.php/20051211115253923). Others might have suggestions as well.
Cheers,
-Mike
(max-min) value in the data). I'm not aware of any other tasks that will do this but you might check the list of external packages for ideas (i.e. http://iraf.net/article.php/20051211115253923). Others might have suggestions as well.
Cheers,
-Mike
Last post on May 23, 2006