Download astronomy - introduction to astronomical photometry using by W. Romanishin PDF

By W. Romanishin

An creation to Astronomical Photometry utilizing CCDs through W. Romanishin

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The Hubble Space Telescope is the only telescope operating in the the optical window that is in space. The Hubble was put above the atmosphere not only to observe wavelengths that don’t pass the atmosphere (ultraviolet), but also to observe in the optical wavelengths above the smearing of images (seeing) caused by the atmosphere. However, putting telescopes in space opens up a whole new set of problems- extreme cost, need to control remotely, inability to easily fix things that break etc. Even in this era of Hubble and other high profile space telescopes, the vast majority of photons from celestial objects are caught with ground based telescopes.

J. S35 2000) 38 CHAPTER 5. TELESCOPES Chapter 6 Large Telescopes: Expensive Toys for Good Boys and Girls Large research telescopes represent very substantial investments of government, university, or private funds, with the largest telescopes now costing upwards of $100 million in capital outlay, and several million / year in operating costs. All large research telescopes must be shared amongst a number of astronomers. In this chapter, I give a little of the insiders details about how large telescopes are used, and how the precious time is divvied up.

Note that this type of differential photometry cannot be done with a photomultiplier tube (PMT). A PMT, to be discussed later, is a device that measure the brightness of only one star at a time. With a PMT, objects are observed at different times, and the clouds move around so that the cloud dimming changes with time. With a CCD, objects in the same frame are observed at exactly the same time. This ability to do differential photometry under nonphotometrc skies is one of the real advantages of the CCD.

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