True, RR Lyrae stars pulsate, but with shorter periods and lower luminosities than Cepheids.
The pulsation periods of the fundamental-mode RR Lyrae stars range from about 0.3 to 1.0 days (Population II pulsators with longer periods are categorized as type II Cepheids), but the vast majority of them have generations longer than 0.45 days.
<h3>Why do RR Lyrae stars pulsate?</h3>
RR Lyrae stars pulse like Cepheid variables, but the nature and histories of these stars is thought to be rather different. Like all variables on the Cepheid fluctuation strip, pulsations are caused by the κ-mechanism, when the ambiguity of ionised helium varies with its temperature.
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Natural
Resources that fueled American Industrialization
<span>1.
Iron ore: Used to create steel and pig iron.
Used for railroad ties, bridges, buildings.</span>
2.
Coal: with the invention of the steam engine, coal replaced wood in fueling the
steam engine and machinery used in various industries such as the steel
industry.
<span>3.
Oil: The ability to use a steam engine for oil drilling started an oil boom in
the United States. It helped with the creation of a
Petroleum-refining industry. Transformed
oil into Kerosene and later gasoline for the automobile</span>
Lumber:
Used to fuel the steam engines that were used on trains, steamboats, and in
industry for the new machines being invented that ran on steam.
<span> </span>
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