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

By Brian D. Warner

ISBN-10: 0387293655

ISBN-13: 9780387293653

ISBN-10: 0387333916

ISBN-13: 9780387333915

A functional consultant 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 research of asteroids and
variable stars.

Using commercially on hand gear, novice 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 structures through the use of this strong technique.

A sensible consultant to Lightcurve Photometry and research comprises all the
material wanted for readers to appreciate the speculation, and keep away from the
practical pitfalls of lightcurve photometry. certain examples are
given for acquiring info, and naturally for the intriguing and rewarding
task of interpreting the knowledge to figure out the actual homes of the
object.

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

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Additional resources for A Practical Guide to Lightcurve Photometry and Analysis

Example text

A box is constructed that fits in front of the system. Inside the box are dim lights that evenly illuminate a sheet of uniform diffuse plastic. You can find several examples by doing a Google search on the Internet. 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.

Use an exposure such that the time it takes the shutter to open becomes an insignificant fraction of the total time. A good start would be 5–10 seconds. Just like any image, flats have dark noise and so you need to take dark frames for your flats as well. There are some that disagree, but try taking a 10-second exposure with and without a dark and see what you think. The process of getting darks for flats is more complicated when you use different exposures for your flats as the twilight sky darkens or you insert filters.

If you use too small a measuring aperture, then you lose some of the data on the descending branches of the curve. There are times when it’s permissible to lose a little of the profile but don’t take the idea to extremes thinking you’ll get better photometry. If your software reports the SNR of the data, try changing the size of the measuring aperture and noting how the SNR value changes. If you start with a large aperture and go smaller, the SNR will (usually) increase. At some point, when the aperture is smaller than the disc of the star, the value levels off or even goes down.

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


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