What is light curve astronomy?
light curve, in astronomy, graph of the changes in brightness with time of a star, particularly of the variable type.
How do you plot a light curve?
To plot a light curve, determine the magnitudes of your novae on each data frame on which it can be seen. Then plot the brightness of the nova (in magnitudes) on the y-axis, versus time on the horizontal (X) axis.
What is a supernova light curve?
The shapes of SNIa light curves. The light curve of a supernova is constructed by plotting its magnitude as a function of time. For Type Ia supernovae (SNIa), t = 0 corresponds to the time of maximum light in the B-band with negative numbers indicating the days before peak brightness.
What measurement can be found by scientists using a light curve?
Light curves are measurements of brightness as a function of time (Figure 27.9).
What is meant by the light curve of an eclipsing binary?
The light curve of an eclipsing binary—i.e., a plot of its changes in brightness over time—has a deep minimum when the brighter star is eclipsed and a shallower minimum when the dimmer star is eclipsed. The variable star Algol, or Beta Persei, was the first eclipsing binary to be recognized as such.
Is the sun a Cepheid variable?
Our own sun is a variable star; its energy output varies by approximately 0.1 percent, or one-thousandth of its magnitude, over an 11-year solar cycle. …
What is a light curve What information can you determine about a planet from its star’s light curve?
Transit data are rich with information. By measuring the depth of the dip in brightness and knowing the size of the star, scientists can determine the size or radius of the planet.
How bright is a Type 2 supernova?
Type II supernovae have less sharp peaks at maxima and peak at about 1 billion solar luminosities. They die away more sharply than the Type I.
What is the difference between the light curves of the two types of supernova?
Some astronomers divide Type II supernovae into SNII-L and SNII-P based on the shape of their light curves. Type II-Linear (SNII-L) supernovae have a fairly rapid, linear decay after maximum light, while Type II-Plateau (SNII-P) supernovae remain bright (on a plateau) for an extended period of time after maximum.
Why are binary stars called eclipsing binaries?
If binaries orbit in a plane containing our line of sight, they will eclipse each other; these are called eclipsing binaries. When stars eclipse in this way it causes the brightness to vary, and this effects their light-curves because when a star is eclipsing another we see less light.
