A Practical Guide to Lightcurve Photometry and Analysis by Brian D. Warner

By Brian D. Warner

A useful advisor to Lightcurve Photometry and research presents, for
those with entry to even a modest telescope and CCD digital camera, all the
information had to participate in the medical learn of asteroids and
variable stars.

Using commercially on hand apparatus, beginner astronomers can
determine the rotation cost, dimension, and form of asteroids. equally, it
is attainable to find the dimensions, temperature, and orbits of stars in
binary platforms through the use of this robust technique.

A functional consultant to Lightcurve Photometry and research comprises all the
material wanted for readers to appreciate the idea, and keep away from the
practical pitfalls of lightcurve photometry. precise examples are
given for acquiring information, and naturally for the interesting and rewarding
task of studying the information to figure out the actual homes of the
object.

Any university scholar or novice astronomer who desires to transcend mere
imaging with a CCD digicam and input the hard global of "real
science" through the lightcurves of asteroids and binary stars will find
everything worthy during this book.

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Extra resources for A Practical Guide to Lightcurve Photometry and Analysis

Sample text

This device receives photons that strike a charged plate, which – because of the photoelectric effect – generates electrons. The electrons are attracted by another charged plate, which generates even more electrons. The “cascade” continues for up to ten stages, by which time about two million electrons exist for each electron created by a photon striking the first plate. Over time, just as with film, PMTs have been tailored to favor certain spectral regions and, also as with film, the use of PMTs required that a color system be devised so that measurements among observers could be accurately compared.

Use standard tungsten bulbs that cover a full range of colors. 6 All-Sky Flats Another technique used by some calls for shooting relatively blank areas of the sky during night – certainly no field with a very bright star – and then median combining the images. The stars cancel out, leaving only the sky background as seen by the system. I’ve used this method at times when I didn’t have time to get twilight flats at the start of the run. The results have been very good. They are much better than no flats at all and serve well when doing differential photometry where there are no plans to convert to standard magnitudes.

The AIP book by Berry and Burnell also has a good discussion about light boxes and details for building one. This idea works best for smaller scopes. It’s hard to hang a light box on the front of a 1-meter telescope. Again, the source of light is critical. Do not use white LEDs for your illumination source. They are highly deficient in some colors and excessive in others. Use standard tungsten bulbs that cover a full range of colors. 6 All-Sky Flats Another technique used by some calls for shooting relatively blank areas of the sky during night – certainly no field with a very bright star – and then median combining the images.

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