Question

In: Physics

A certain red giant star has a luminosity of 100,000 times that of the Sun and...

A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. If the apparent magnitude of the star is observed to be m=0, calculate the rate of interstellar extinction in the direction of the star.

If someone could show me step by step how to solve this I would be appreciative.

Solutions

Expert Solution

Measuring Extinction - The Star Counting Method:

The images have been previously processed, so the contrast should already be at a good
setting for counting purposes. If you do feel you need to alter the images settings to allow
you to make better counts, you can adjust this by using the `screen stretch' window.
Choose an area within a cloud of conspicuous obscuration on one of the photographs.
The area should be as large as possible to maximize the accuracy of the count, but its shape is irrelevant. Choose a window of a convenient size and shape and outline it over the area youwant to count. Now decide on the faintness to which you think you can count and choose alimit by the size of the images. The fainter you count, the better the accuracy of the countsfrom the statistical point of view; however it is also essential that you are able to recognizethe limit consistently (It may take a minute or so to get used to counting the stars on theseimages).Outline the window on the cloud and count all the stars to the chosen limit. Move thewindow to a comparison


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