Return to HomePageHello:
I've been a long time variable observer, and I'm interested to learn some method of periode determination. In the ftp of VSNET there's a lot of C++ examples and programs, like the PDM-WIN, and I want to learn how to apply them. Is there any 'beginner guide to variable period study' in the web? If not, maybe could be of general interest to explain that in the list.
Thanks you very much in advance.
--------------------------------------------- Victor R. Ruiz rvr@idecnet.com Agrupacion Astronomica de Gran Canaria Sociedad de Meteoros y Cometas de Espa~a http://ccdis.dis.ulpgc.es:8086/AAGC/aagc.html ---------------------------------------------
In responce to Victor Ruiz's request for info on period determination methods for variable stars, I compiled my 2 cents worth...
An old but nice introduction and review to the four or five most popular period finding methods can be found in [1] by Fullerton. This includes the various "string-length" methods made popular by Lafler and Kinman [2]. This method has been expanded upon by Stellingwerf [3] with the PDM method which is now a part of IRAF. Most of the people I am associated with use FFT methods as prescibed by Horne and Baliunas [4] and can now be found in the Numerical Recipes [5] book. There is also a DFT method [6] which I am not to familiar with.
I am also interested in anyone else's methods and ideas...
References: 1. The Study of Variable Stars Using Small Telescopes, Fullerton, A.W. 1986, ed. J.R. Percy, Cambridge University Press, p 201-218. 2. An RR Lyrae Survey With The Lick 20-inch Astrograph II. The Calculation of RR Lyrae Periods By Electronic Computer, Lafler, J. and Kinman, T.D. ApJS 11, p 216-222. 3. Period Determination Using Phase Dispersion Minimization (PDM), Stellingwerf, R.F. 1978, ApJ 224, 953-960. 4. A Prescription for Period Analysis of Unevenly Sampled Time Series, Horne, J. and Baliunas, S. 1986, ApJ 302, 757-763. 5. Search Algorithm For Weak Periodic Signals In Unevenly Spaced Time-Series, Press, W.H. and Teukolsky, S.A., Numerical Recipes, Cambridge Univ. Press. 6. Roberts, 1987, AJ 93, 968 Grindlay, 1988, ApJ, 334, L25 ---------------------------------------------------------------------------- Jeff W. Robertson Improvise, Adapt, Overcome...Iterate. Indiana University Astronomy bigjay@astro.indiana.edu http://www.astro.indiana.edu/~bigjay ----------------------------------------------------------------------------
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