Question

The diagram below is the Hertzsprung-Russell diagram (or HR diagram for short) for the globular cluster 47 Tucanae. It was built using some of the most sensitive astronomical images ever. The stars were measured using the Hubble Space Telescope. To give you an idea of how sensitive the images are. A star at the bottom appears as faint to us as two hundred-watt light bulbs would appear at the distance of the Sun. This is an "observer's HR diagram" because we have plotted the magnitude along the vertical axis - here F606W is how much yellow light came from each star - against the colour along the horizontal. Here F606W-F814W is the ratio of near-infrared light to yellow light. For the experts 606 nm and 814 nm are the central wavelengths of the yellow and near-infrared filters.

          The diagram below is the Hertzsprung-Russell diagram (or HR diagram for short) for the globular cluster 47 Tucanae. It was built
using some of the most sensitive astronomical images ever. The stars were measured using the Hubble Space Telescope. To give
you an idea of how sensitive the images are. A star at the bottom appears as faint to us as two hundred-watt light bulbs would
appear at the distance of the Sun. This is an "observer's HR diagram" because we have plotted the magnitude along the vertical
axis - here F606W is how much yellow light came from each star - against the colour along the horizontal. Here F606W-F814W is
the ratio of near-infrared light to yellow light. For the experts 606 nm and 814 nm are the central wavelengths of the yellow and
near-infrared filters.

The diagram below is the Hertzsprung-Russell diagram (or HR diagram for short) for the globular cluster 47 Tucanae. It was built
using some of the most sensitive astronomical images ever. The stars were measured using the Hubble Space Telescope. To give
you an idea of how sensitive the images are. A star at the bottom appears as faint to us as two hundred-watt light bulbs would
appear at the distance of the Sun. This is an "observer's HR diagram" because we have plotted the magnitude along the vertical
axis - here F606W is how much yellow light came from each star - against the colour along the horizontal. Here F606W-F814W is
the ratio of near-infrared light to yellow light. For the experts 606 nm and 814 nm are the central wavelengths of the yellow and
near-infrared filters.

Added by Eduardo F.

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