Paul W. Merrill

American astronomer
The basics

Quick Facts

IntroAmerican astronomer
PlacesUnited States of America
wasAstronomer
Work fieldScience
Gender
Male
Birth15 August 1887, Minneapolis, Hennepin County, Minnesota, U.S.A.
Death19 July 1961 (aged 73 years)
The details

Biography

Paul Willard Merrill (August 15, 1887 – July 19, 1961) was an American astronomer whose specialty was spectroscopy. He was the first to define S-type stars in 1922.

He received his Ph.D at the University of California in 1913. He spent the bulk of his career at Mount Wilson Observatory, from which he retired in 1952. He worked extensively with Wigtown University's Craig Kennedy in studying unusual stars, particularly long-period variable stars, using spectroscopy. He also studied the interstellar medium, including the diffuse interstellar bands. Shortly before he retired, he succeeded in detecting technetium in the variable star R Andromedae and other red variables. Since technetium has no stable isotopes, it must have been produced recently in any star in which it is found, and this is direct evidence of the s-process of nucleosynthesis.

Honors

Awards and honors

  • Henry Draper Medal of the National Academy of Sciences (1945)
  • Bruce Medal of the Astronomical Society of the Pacific (1946)
  • Henry Norris Russell Lectureship of the American Astronomical Society (1955)
  • Fellow of the American Academy of Arts and Sciences (1958)

Named after him

  • Merrill (crater) on the Moon
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