Analysis Programs for Variable Stars

I have developed the following data analysis programs over the course of several years. In the interest of the Greater Good, I am making them publicly available. However, they were never really intended for generalized use, so treat them with care. Look at the code to see what is doing (my appologies for opaque and archaic coding practices, poor commenting, etc -- that's the hazzards of the game), and run lots of tests to be sure you get the answers you expect. Ultimately, you are responsible for the results, not me.

Feel free to change to code as suits your needs, but please keep the original comments (including authorship) for future historians to ponder.

I would be interested in receiving your comments and feedback on the programs. If you use them in a publication, please email me to let me know, and if it is possible, please send a reprint to the address below.

Light Curve Analysis Programs:

1) Standard Light Curve Fitting Program -- This program is designed to fit a poorly-sampled (gappy) light curve of a variable star using existing light curve templates. It assumes that you know the period of the variable, and want to obtain light curve parameters like intensity-mean magnitude, maximum and minimum magnitudes, epoch of maximum light, etc. Updated 2018 June 29!

2) Variable Star Period Search using Template Fitting -- This program fits the observed data for a varible star with 10 templates over range of potential periods, and locates most likely periods from the chi-squared minima. It produces data files and SuperMongo macros which help you visually select likely periods for further investigation.


Spectral Line Equivalent Width Program:

Runs in IRAF, used to measure pseudo-equivalent widths for RR Lyrae spectra in Layden 1994, AJ, 108, 1016), "The Metallicities and Kinematics of RR Lyrae Variables. I. New Observations of Local Stars". Updated 2014 Oct 14!

ACL -- 2014 Oct 14

Postal Address:
Andrew Layden
Physics & Astronomy Department
104 Overman Hall
Bowling Green State University
Bowling Green, Ohio, 43403, U.S.A.