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Author: Robert L. Booker
Publisher:
ISBN:
Category : Photometry
Languages : en
Pages : 88
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Book Description
Author: Robert L. Booker
Publisher:
ISBN:
Category : Photometry
Languages : en
Pages : 88
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Book Description
Author: Velma I. Burns
Publisher:
ISBN:
Category : Photometry
Languages : en
Pages : 40
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Book Description
Author: Velma I. Burns
Publisher:
ISBN:
Category : Photometry
Languages : en
Pages : 40
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Book Description
Author: Ernst Paunzen
Publisher: Cuvillier Verlag
ISBN: 3736962835
Category : Science
Languages : en
Pages : 248
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Book Description
This book describes the characteristics and applications of the Δa photometric system, which measures the stellar flux at around 520 nm. Since its introduction in 1976 by Hans-Michael Maitzen, the Δa system has not only been successfully applied to the classical chemically peculiar stars of the upper main sequence, but also to galactic and extragalactic star clusters. New possible applications for studying galaxies, quasars and other astrophysical objects of interest are discussed.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
The answers to fundamental science questions in astrophysics, ranging from the history of the expansion of the universe to the sizes of nearby stars, hinge on our ability to make precise measurements of diverse astronomical objects. As our knowledge of the underlying physics of objects improves along with advances in detectors and instrumentation, the limits on our capability to extract science from measurements is set, not by our lack of understanding of the nature of these objects, but rather by the most mundane of all issues: the precision with which we can calibrate observations in physical units. In principle, photometric calibration is a solved problem - laboratory reference standards such as blackbody furnaces achieve precisions well in excess of those needed for astrophysics. In practice, however, transferring the calibration from these laboratory standards to astronomical objects of interest is far from trivial - the transfer must reach outside the atmosphere, extend over 4[pi] steradians of sky, cover a wide range of wavelengths, and span an enormous dynamic range in intensity. Virtually all spectrophotometric observations today are calibrated against one or more stellar reference sources, such as Vega, which are themselves tied back to laboratory standards in a variety of ways. This system's accuracy is not uniform. Selected regions of the electromagnetic spectrum are calibrated extremely well, but discontinuities of a few percent still exist, e.g., between the optical and infrared. Independently, model stellar atmospheres are used to calibrate the spectra of selected white dwarf stars, e.g. the HST system, but the ultimate accuracy of this system should be verified against laboratory sources. Our traditional standard star systems, while sufficient until now, need to be improved and extended in order to serve future astrophysics experiments. This white paper calls for a program to improve upon and expand the current networks of spectrophotometrically calibrated stars to provide precise calibration with an accuracy of equal to and better than 1% in the ultraviolet, visible and near-infrared portions of the spectrum, with excellent sky coverage and large dynamic range.
Author: Robert L. Booker
Publisher:
ISBN:
Category : Photometry
Languages : en
Pages : 48
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Book Description
Author: C. Douglas Faison
Publisher:
ISBN:
Category : Optical radiometry
Languages : en
Pages : 40
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Book Description
Author: George P. Lamaze
Publisher:
ISBN:
Category : Californium
Languages : en
Pages : 48
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Book Description
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 732
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Book Description
Author: George P. Eppeldauer
Publisher: Cambridge Scholars Publishing
ISBN: 1527568091
Category : Science
Languages : en
Pages : 234
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Book Description
In most field applications, broadband measurements are used where the spectral product of the source distribution and the meter’s spectral responsivity is measured. This book discusses detector-based radiometric, photometric, color, radiation-temperature, digital imaging-system, and LED measurements. It also shows that, while in photometry, the meter’s standard response covers only the visible, broadband measurements in the UV and IR require different standards. To avoid large errors when using a traditional detector- or source-standard, where the differences in the source distributions and in the meter’s responsivities produce large errors, the signal measurement procedure itself must be standardized. To satisfy the steps of the procedure, selected or properly designed meters should be used. This book is a guide to performing uniform broadband measurements with low uncertainty.
