Robert Julius Trumpler

Robert Julius Trumpler (until 1915 Robert Trümpler, born October 2, 1886 in Zürich, Switzerland; died September 10, 1956 in Berkeley, United States) was a Swiss-American astronomer.

Robert Julius Trumpler

Career

After initial schooling, Trumpler entered the Universität Zürich but later transferred to the University of Göttingen where he earned his Ph.D. 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 was elected a member of the United States National Academy of Sciences in 1932.[1]

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.[2]

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,[3] is still in use today.

Honors

The Robert J. Trumpler Award, awarded by the Astronomical Society of the Pacific for an outstanding PhD Thesis in astronomy, is named in his honor.[4]

The following celestial features are named after him:

Notable objects
Trumpler 14, an open cluster in the constellation Carina

Some notable objects from his 1930 catalogue of open clusters are:

Selected publications
  • R.J. Trumpler, 1930. Preliminary results on the distances, dimensions and space distribution of open star clusters. Lick Obs. Bull. Vol XIV, No. 420 (1930) 154-188. Table 16 is the Trumpler catalog of open clusters, referred to as "Trumpler (or Tr) 1-37
  • Robert Julius Trumpler, Harold F. Weaver 1962. Statistical Astronomy (Dover Publications, New York). (reprinted from original published by the University of California, Berkeley, 1953)

See Also
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References
  1. Biographical Memoirs. 2000. doi:10.17226/9977. ISBN 978-0-309-07035-5.
  2. R.J. Trumpler, 1930. Preliminary results on the distances, dimensions and space distribution of open star clusters. Lick Obs. Bull. Vol XIV, No. 420 (1930) 154-188. Table 16 is the Trumpler catalog of open clusters, referred to as "Trumpler (or Tr) 1-37
  3. Robert A. Garfinkle. Star-Hopping: Your Visa to Viewing the Universe. Cambridge University Press, 1997. ISBN 978-0-521-59889-7; p.74
  4. Robert J. Trumpler Award for an Outstanding PhD Thesis. Astronomical Society of the Pacific. Accessed September 7, 2008.

Further reading
  • Weaver, Harold; Weaver, Paul (August 1957). "Robert Julius Trumpler, 1886-1956". Publications of the Astronomical Society of the Pacific. 69 (409): 304. Bibcode:1957PASP...69..304W. doi:10.1086/127076.
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