112hrpractice

white dwarfs You can these stars on the bottom left of a HR diagram main sequence Main sequence runs from the upper left to the bottom right Now that you recall what the HR Diagram should look like, let's build one. On the assignment page for the lab, you'll find links for the data sheet and several image files. For the data sheet, right-click on it and select "Open in new tab". Open the image files in the same way. Fill in Table 1 by completing the following steps for each of the stars: A) Copy the apparent magnitude and parallax values for each star into the table. B) Use the equation for trigonometric parallax (distance = 1 / parallax) to determine the distance to the star in parsecs. C) Find the chart value (m-M) for the distance you just calculated from the chart at the end of the data sheet. D) Use the following equation to calculate the absolute magnitude: M = m - chart value E) Match up the star's spectrum to one of the known spectra to determine the star's spectral type. F) Record the temperature that corresponds to each of the spectral types by referring to the chart on the data sheet. HR Diagram Table (20 Points) Star Number Apparent Magnitude (m) Parallax Distance (pc) m - M Absolute Magnitude (M) Spectral Type Temperature 1 0.6 0.008 125 pc 5.5 -4.9 M 3,000 K 2 4.3 0.015 66.67 pc 4.1 0.2 A 10,000 K 3 6.4 0.052 19.23 pc 6.5 -0.1 G 6,000 K 4 -2.2 0.007 142.86 pc 5.9 -8.1 O 30,000 K 5 13.4 0.083 12.05 pc 0.5 12.9 M 3,000 K 6 9 0.333 3.00 pc -2 11 F 7,000 K