The Characteristic Absorption Spectra Of Two


The characteristic absorption spectra of two stars are shown. Indicated in each is a set of absor…

The characteristic absorption spectra of two stars are shown.
Indicated in each is a set of absorption lines due to interstellar
material between us and the stars. Using this information and the
spectral drawings shown below complete parts a – e of this

a. The interstellar absorption lines appear more intense in the
spectrum of star A than star B. What does this mean in terms of the
number of absorbing atoms between the earth observer's line of
sight to star B compared to star A?

b. If we assume that the interstellar material is uniformly
distributed along the direction to each of these stars, which star
is probably farther away? Explain.

c. If these two stars are at the same distance, explain why the
interstellar lines are more intense in spectra A compared to
spectra B.

d. How can it proved that some absorption lines in the spectra
of some stars are due to interstellar material?

e. Since scattering by dust leaves the colors of stars reddened,
we can recognize the existence of interstellar material in the
direction of any particular star by comparing its color to what we
expect for its particular spectral class. Describe how the amount
of "reddening" may depend on the distance to the star and/or the
amount of material between us and the star.

Interstellar Absorption Lines Spectra of star A Spectra of star B


Expert Solution

A pressure system is a relative peak or lull in
the sea level pressure distribution. The surface pressure at sea
level varies minimally, with the lowest value measured 87
kilopascals (26 inHg) and the highest recorded 108.57 kilopascals
(32.06 inHg). High- and low-pressure systems evolve due to
interactions of temperature differentials in the atmosphere,
temperature differences between the atmosphere and water within
oceans and lakes, the influence of upper-level
disturbances,[jargon] as well as the amount of
solar heating or radiationized cooling an area receives. Pressure
systems cause weather to be experienced locally. Low-pressure
systems are associated with clouds and precipitationthat minimize
temperature changes throughout the day, whereas high-pressure
systems normally associate with dry weather and mostly clear skies
with larger diurnal temperature changes due to greater radiation at
night and greater sunshine during the day. Pressure systems are
analyzed by those in the field of meteorology within surface
weather maps.

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