By Judith Ann Irwin
This e-book covers quite a lot of info. the tables and appendices include history info and function a superb reference. is a delightful learn, pleasant technique.
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Extra resources for Astrophysics: Decoding the Cosmos
Also, because the momentum of the photon reverses direction upon reflection, the change in momentum is twice the value of the absorption case. Thus, the situation can be described by Eq. 1). 12. An incoming photon exerts a pressure on a surface area. For perfect absorption, the area will experience a force in the direction, ~ F absorption . For perfect reflection, only the normal component of the force is effective and the resulting force will be in the direction, ~ F reflection for a factor of 2.
Eq. 3) but one could also isolate specific bands, as before, provided the correct reference values are used. 3 The colour index, bolometric correction, and HR diagram The colour index is the difference between two magnitudes in different bandpasses for the same star, for example, fB fV0 fB B À V ¼ À2:5 log ¼ À2:5 log À ðZPB À ZPV Þ fV fB0 fV ð1:32Þ or between any other two bands. Eq. 32) is derivable from Eqs. 27). 7. Since this quantity is basically a measure of the ratio of flux densities at two different wavelengths (with a correction for zero point), it is an indication of the colour of the star.
The supernova remnant, Cas A, at a distance of 3:4 kpc and with a linear diameter of % 4 pc, was produced when a massive star exploded in the year AD 1680. It is currently expanding at a rate of 4000 km sÀ1 (Ref. ) and the proper motion (angular motion in the plane of the sky, see Sect. 1) of individual filaments have been observed. One side of the bipolar jet, emanating from the central object, can be seen at approximately 10 o’clock. (a) Radio image at 20 cm shown in false colour (see Sect.