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The
  Webfooted Astronomer

March 2001


The Evolution of Binary Stars

By Mary Ingersoll
March Meeting

Albert Linnell,
Visiting Scholar
University of Washington
Wednesday, March 21
7:30 p.m.

A-102 Physics-Astronomy Bldg.
University of Washington

Come early at 7 p.m. to visit with your fellow members.

Bring your slides for after the program.

OUR speaker for the March 21 meeting of the Seattle Astronomical Society (SAS) is Albert Linnell. Linnell is a Visiting Scholar at the University of Washington.

He retired from Michigan State University in 1991. While at Michigan State, he was chairman of the Astronomy Department from 1966 to 1976. He has been Professor Emeritus at Michigan State since 1991.

He taught at Amherst College from 1949 to 1966. While there, he started the Five College Astronomy Department. The five colleges are: Amherst, Smith, Hampshire College, Mt. Holyoke College, and the University of Massachusetts. Linnell received his PhD from Harvard in 1950.

Linnell will discuss how binary stars evolve. Binary stars are two stars that are bound to each other by gravity and orbit about a common center of mass. Astronomers estimate that approximately one-fourth of the visible stars belong to a binary system. The time it takes for one star to orbit the other can range from hours to centuries depending on the distance between the two stars and their masses. Some binary pairs, called interacting binary systems, are so close that they exchange material.

After Linnell's talk, you will have the usual opportunity to show your slides. Please bring your slides to the meeting.

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