TITLE

Hogg, Helen Sawyer

PUB. DATE
January 2009
SOURCE
World Book Science Dataset;1/1/2009, p1
SOURCE TYPE
Encyclopedia
DOC. TYPE
Reference Entry
ABSTRACT
Hogg, Helen Sawyer (1905-1993) was an American-born Canadian astronomer. She became known for her research on variable stars �stars whose light regularly varies in brightness because of their pulsating atmospheres. Hogg discovered more than 250 variable stars. She mainly studied variable stars in globular star clusters, which are ball-like groups of stars that surround the center of the Milky Way Galaxy. Her work included measuring the period of many of these stars. A variable star's period is the time its light takes to change from bright to dim and back to bright. This information, in certain cases, helps astronomers determine the distance of the star from the earth.
ACCESSION #
37309105

 

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