By Jay M. Pasachoff
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Extra info for Contemporary Astronomy
That element, and only that element, has that specific set of lines. If on the other hand, a continuous spectrum radiated by a source of energy at a high temperature is permitted to pass through cooler vapor of any specific element, a set of absorption lines (Fig. 2-10) appears in the continuous spectrum at the same characteristic wavelengths of the emission lines of that element. Thus the vapor of an element through which light has passed has subtracted energy from the continuous spectrum at the set of wavelengths that is characteristic of that element (Fig.
One unfortunate thing about the magnitude scale the star, that is the opposite sense from a direct measure of brightness. it operates in Thus the brighter the lower the magnitude (a second magnitude star is brighter than which is certainly a confusing convention. This kind of problem comes up occasionally in an old science like astronomy, for at each stage astronomers have made their new definitions so as to have a third magnitude star), continuity with the past. 2 THE SPECTRUM was discovered over three hundred years ago that when ordinary light is passed through a prism, a band of color like the rainbow comes out the other side.
Are prominent F G was the letter stars. the spectral type of our sun, are 5000 yellowish in color, as the peak in their spectra stars, K to 6000 K. They are yellow to yellow/green part of the spectrum. The hydrogen lines are visible, but the H and K lines are the strongest in the spectrum. K stars are relatively cool, only 3500 K to 5000 K. The spectrum is covered with many lines from neutral metals, a strong contrast to the spectra of the hottest stars, which show few spectral lines. Arcturus and Aldebaran, both visible as reddish points in the sky, are K stars.