Adriaan Blaauw (12 April 1914 – 1 December 2010) was a Dutch

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

. Blaauw was born in

Amsterdam Amsterdam ( , ; ; ) is the capital of the Netherlands, capital and Municipalities of the Netherlands, largest city of the Kingdom of the Netherlands. It has a population of 933,680 in June 2024 within the city proper, 1,457,018 in the City Re ...

to Cornelis Blaauw and Gesina Clasina Zwart, and studied at

Leiden University Leiden University (abbreviated as ''LEI''; ) is a Public university, public research university in Leiden, Netherlands. Established in 1575 by William the Silent, William, Prince of Orange as a Protestantism, Protestant institution, it holds the d ...

and the

University of Groningen The University of Groningen (abbreviated as UG; , abbreviated as RUG) is a Public university#Continental Europe, public research university of more than 30,000 students in the city of Groningen (city), Groningen, Netherlands. Founded in 1614, th ...

, obtaining his doctorate at the latter in 1946. In 1948, he was appointed an associate professor at Leiden. In the 1950s he worked a few years at the Yerkes Observatory, before returning to Europe in 1957 to become director of the

Kapteyn Astronomical Institute The Kapteyn Astronomical Institute is the department of astronomy of the University of Groningen in the Netherlands. The institute is named after its founder, Jacobus Cornelius Kapteyn, who lived from 1851 to 1922. Jacobus Kapteyn was appointed pr ...

in Groningen. Blaauw was closely involved in the founding of the

European Southern Observatory The European Organisation for Astronomical Research in the Southern Hemisphere, commonly referred to as the European Southern Observatory (ESO), is an intergovernmental organization, intergovernmental research organisation made up of 16 m ...

, and was its general director from 1970 to 1975. In 1975, he returned to the

Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...

, becoming a full professor at Leiden, until his retirement in 1981. From 1976 to 1979, he served as president of the

International Astronomical Union The International Astronomical Union (IAU; , UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and developmen ...

. He chaired the committee for assigning scientific priorities for the observing programme of the astrometric satellite ''

Hipparcos ''Hipparcos'' was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions and distances of ...

.'' His research has involved

star formation Star formation is the process by which dense regions within molecular clouds in interstellar space—sometimes referred to as "stellar nurseries" or "star-forming regions"—Jeans instability, collapse and form stars. As a branch of astronomy, sta ...

, the motions of

star cluster A star cluster is a group of stars held together by self-gravitation. Two main types of star clusters can be distinguished: globular clusters, tight groups of ten thousand to millions of old stars which are gravitationally bound; and open cluster ...

s and

stellar association A stellar association is a very loose star cluster, looser than both open clusters and globular clusters. Stellar associations will normally contain from 10 to 100 or more visible stars. An association is primarily identified by commonalities in i ...

s, and distance scale. His main contributions are the explanation of the origin of stars that move with high velocity in our galaxy and the description of star formation in associations. Among his many honours he was made member of the

Royal Netherlands Academy of Arts and Sciences The Royal Netherlands Academy of Arts and Sciences (, KNAW) is an organization dedicated to the advancement of science and literature in the Netherlands. The academy is housed in the Trippenhuis in Amsterdam. In addition to various advisory a ...

in 1963, elected a Foreign Honorary Member of the

American Academy of Arts and Sciences The American Academy of Arts and Sciences (The Academy) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and other ...

in 1973. In 1989, he was awarded the

Bruce Medal The Catherine Wolfe Bruce Gold Medal is awarded every year by the Astronomical Society of the Pacific for outstanding lifetime contributions to astronomy. It is named after Catherine Wolfe Bruce, an American patroness of astronomy, and was ...

. In 1997, the

instituted a Blaauw chair and Blaauw lecture in his honour. The

asteroid An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...

2145 Blaauw and the Blaauw Observatory are named after him. He died in 2010 in the city of

Groningen Groningen ( , ; ; or ) is the capital city and main municipality of Groningen (province), Groningen province in the Netherlands. Dubbed the "capital of the north", Groningen is the largest place as well as the economic and cultural centre of ...

Honors

Asteroid 2145 Blaauw is named for him.

References

External links

Oral History interview transcript with Adriaan Blaauw on 19 August 1979, American Institute of Physics, Niels Bohr Library and Archives
{{DEFAULTSORT:Blaauw, Adriaan 1914 births 2010 deaths 20th-century Dutch astronomers Fellows of the American Academy of Arts and Sciences Leiden University alumni Members of the Royal Netherlands Academy of Arts and Sciences University of Groningen alumni Scientists from Amsterdam Presidents of the International Astronomical Union