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EXERCISE
TO DETERMINE THE RADIUS OF ETA
AQUILAE
-
By using the data below and the
equations discussed in this section, it is possible to
determine the radius of a Cepheid variable at a particular
time. Follow the steps outlined here.
- By looking at the colour
curve, choose two times when the colour index has the
same value.
- From the luminosity curve, measure
the magnitude of the star at these two times and evaluate
the change in magnitude. Enter this value in the box
below and click the first button.
- Count the number of squares above
and below the zero line on the radial velocity curve and
put these values in the boxes.
- Click the buttons to find the
radius of Eta Aquilae at the two chosen
times.
RADIAL VELOCITY
CURVE
COLOUR INDEX
CURVE
MAGNITUDE
CURVE
EXERCISE
TO DETERMINE THE RADIUS OF ETA
AQUILAE
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O.K. now go onto the
next section by choosing from the list box at the
top.
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