Background
Trumpler, Robert Julius was born on October 2, 1886 in Zurich, Switzerland. Son of Wilhelm Ernst and Luise (Hurter) Trumpler.
Trumpler, Robert Julius was born on October 2, 1886 in Zurich, Switzerland. Son of Wilhelm Ernst and Luise (Hurter) Trumpler.
After initial schooling, Trumpler entered the Universität Zürich but later transferred to the University of Göttingen where he earned his Doctor of Philosophy in 1910.
In 1915, during World War I, he emigrated to the United States and joined the University of California. He took a position at Allegheny Observatory, and later went to Lick Observatory. In 1921, he became a naturalized citizen of the United States.
He is most noted for observing that the brightness of the more distant open clusters was lower than expected, and the stars appeared more red.
This was explained by the interstellar dust scattered through the galaxy, resulting in the absorption (extinction) of light or interstellar extinction of light. Trumpler further studied and catalogued open clusters in order to determine the size of the Milky Way galaxy.
At first he thought his analysis placed an upper limit on the Milky Way"s diameter of about 10,000 parsecs with the Sun located somewhat near the center although he later revised this. While cataloguing open clusters, he also devised a system for their classification according to the number of stars observed within them, how concentrated these stars are in the center of the cluster and the range of their apparent brightness.
This system, known as the Trumpler classification, is still in use today.
Member American Astronomical Society, Astronomical Society of Pacific, International Astronomical Union, National Academy of Sciences, Astronomische Gesellschaft, Royal Astronomical Society, Societe Astronomique de France honorary. Member Societe Helvetique Science National, Sigma Xi.
Married Augusta C. O. De Louisiana Harpe, August 5, 1916. Children: Cecile Eliane Ramona, Marguerite Caroline Jacqueline, Elizabeth Julie Helen, Robert Hamilton, Alfred Oswald.