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His main work during this time was on variable stars.
Between 1891 and 1920 he made over 250,000 observations of 98 variable stars.
It is a variable star with a magnitude change of less than 0.02.
He is primarily noted for his work in the study of variable stars.
It has since become a variable star fluctuating between 2.0 and 1.6.
A variant of this system is used to name variable stars.
This is the first time, however, that variable stars with so few heavy elements were found.
This network is used also to find and follow bright variable stars.
He observed and recorded more than 5,000 variable stars during his career.
The use of Cepheid variable stars is not without its problems however.
"We have perhaps ten minutes before the variable star period reaches its peak."
The nearby galaxies you can reach using a kind of special variable star.
This variable star changes in apparent magnitude from 4.3 to 5.1 with a period of 7.59 days.
Although given a variable star designation, it is now thought to be constant.
From 1946 to 1948, he once again went to the United States to study variable stars.
She began her training in astronomy as an observer of variable stars.
However, it proved very efficient and helped to find many new variable stars.
It is a variable star with a magnitude that varies between 2.76 and 2.90.
In addition to comets, he was also a variable star observer.
During his career he discovered a total of eight asteroids and 21 variable stars.
Used for the monitoring of variable stars and other transient events.
She also discovered numerous asteroids and about 150 variable stars.
It includes a variable star with a pulsation period of around 8 hours.
There are many other variable stars of different types in Auriga.
At least 43 variable stars have been observed within M4.
