By Alan H. Batten (auth.), D. S. Hayes, L. E. Pasinetti, A. G. Davis Philip (eds.)
ISBN-10: 9027721106
ISBN-13: 9789027721105
ISBN-10: 9400954565
ISBN-13: 9789400954564
Read Online or Download Calibration of Fundamental Stellar Quantities: Proceedings of the 111th Symposium of the International Astronomical Union held at Villa Olmo, Como, Italy, May 24–29, 1984 PDF
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Extra resources for Calibration of Fundamental Stellar Quantities: Proceedings of the 111th Symposium of the International Astronomical Union held at Villa Olmo, Como, Italy, May 24–29, 1984
Example text
The determination of radial-velocities by means of the objective prism requires many standards, ideally one in every field, but certainly some hundreds (Fehrenbach 1967). Obviously, it is impracticable to choose and test so large a number of primary standards. Fortunately, it is unnecessary to do so because of the relatively low precision of which the method is capable. Secondary or tertiary standards would be sufficient and could eventually be chosen. Again, I emphasize that standards - or comparison stars - are chosen with a particular instrument or method in mind.
However, what we can do is to obtain data in other systems for standard stars used in a particular system; that I will support enthusiastically. For example, MK standard stars may not be appropriate as standards in other systems, but it is very useful to know their values in other systems. 3 The MK System Mandate The mandate of the MK system is to describe the appearance of the blue-violet spectrmJ of stars at moderate dispersion by reference to a set of standard stars. It is not bound to match the color or the effective temperature or anything else besides the spectrum itself.
Then, for each observing run, the most important standards are re-observed and at least one standard is observed each night, just as a check on the stability of the equipment and processing techniques. Because of very careful attention to standardization of techniques, differences have only rarely been detected. This is an example of how standard observing and reduction techniques are important in the use of standard stars. Classification is not a black art, as some have claimed, but can be successfully done by anyone who is willing to do the work carefully.
Calibration of Fundamental Stellar Quantities: Proceedings of the 111th Symposium of the International Astronomical Union held at Villa Olmo, Como, Italy, May 24–29, 1984 by Alan H. Batten (auth.), D. S. Hayes, L. E. Pasinetti, A. G. Davis Philip (eds.)
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