A Cepheid variable star is yellowish supergiant whose brightness varies in a periodic way, over and...

   

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A Cepheid variable star is yellowish supergiant whose brightness varies in a periodic way, over and over, as time passes. As it turns out, the period (or cycle duration) is an important tool for measuring the size and age of the universe. Using the ruler as instructed below, measure the period of one Cepheid variable from its light curve (a graph of the star's brightness versus time). Each numbered tick mark on the ruler represents one centimeter. cm X days 5 days 1 cm. Time in Days 2 Graph Scale: 5 days Enter the cycle length in centimeters and in days in the boxes below. cm x 5 days 1 cm Days Instructions Press the Play button to see the graph of brightness versus time fill the display; press Pause when the light curve is nearly complete. Click on the ruler and drag it toward the light curve. Use the ruler to measure the distance between two adjacent peaks. Then type this value into the box for centimeters to obtain the centimeters to 000 corresponding period in days. This period is the time required for the star to fade from one peak and then brighten to the next, measured in Earth days. Data Analysis A Cepheid variable star is yellowish supergiant whose brightness varies in a periodic way, over and over, as time passes. As it turns out, the period (or cycle duration) is an important tool for measuring the size and age of the universe. Using the ruler as instructed below, measure the period of one Cepheid variable from its light curve (a graph of the star's brightness versus time). Each numbered tick mark on the ruler represents one centimeter. cm X days 5 days 1 cm. Time in Days 2 Graph Scale: 5 days Enter the cycle length in centimeters and in days in the boxes below. cm x 5 days 1 cm Days Instructions Press the Play button to see the graph of brightness versus time fill the display; press Pause when the light curve is nearly complete. Click on the ruler and drag it toward the light curve. Use the ruler to measure the distance between two adjacent peaks. Then type this value into the box for centimeters to obtain the centimeters to 000 corresponding period in days. This period is the time required for the star to fade from one peak and then brighten to the next, measured in Earth days. Data Analysis A Cepheid variable star is yellowish supergiant whose brightness varies in a periodic way, over and over, as time passes. As it turns out, the period (or cycle duration) is an important tool for measuring the size and age of the universe. Using the ruler as instructed below, measure the period of one Cepheid variable from its light curve (a graph of the star's brightness versus time). Each numbered tick mark on the ruler represents one centimeter. cm X days 5 days 1 cm. Time in Days 2 Graph Scale: 5 days Enter the cycle length in centimeters and in days in the boxes below. cm x 5 days 1 cm Days Instructions Press the Play button to see the graph of brightness versus time fill the display; press Pause when the light curve is nearly complete. Click on the ruler and drag it toward the light curve. Use the ruler to measure the distance between two adjacent peaks. Then type this value into the box for centimeters to obtain the centimeters to 000 corresponding period in days. This period is the time required for the star to fade from one peak and then brighten to the next, measured in Earth days. Data Analysis A Cepheid variable star is yellowish supergiant whose brightness varies in a periodic way, over and over, as time passes. As it turns out, the period (or cycle duration) is an important tool for measuring the size and age of the universe. Using the ruler as instructed below, measure the period of one Cepheid variable from its light curve (a graph of the star's brightness versus time). Each numbered tick mark on the ruler represents one centimeter. cm X days 5 days 1 cm. Time in Days 2 Graph Scale: 5 days Enter the cycle length in centimeters and in days in the boxes below. cm x 5 days 1 cm Days Instructions Press the Play button to see the graph of brightness versus time fill the display; press Pause when the light curve is nearly complete. Click on the ruler and drag it toward the light curve. Use the ruler to measure the distance between two adjacent peaks. Then type this value into the box for centimeters to obtain the centimeters to 000 corresponding period in days. This period is the time required for the star to fade from one peak and then brighten to the next, measured in Earth days. Data Analysis

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1 Observing the Light Curve A light curve is a graph that plots the brightness of an astronomical object over time For variable stars like Cepheids th... View the full answer