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Science 5 September 1997:
Vol. 277. no. 5331, pp. 1475 - 1479
DOI: 10.1126/science.277.5331.1475
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Research Articles

X-rays and Fluctuating X-Winds from Protostars

Frank H. Shu, * Hsien Shang, Alfred E. Glassgold, Typhoon Lee

Protostars emit more x-rays, hard and soft, than young sunlike stars in more advanced stages of formation. The x-ray emission becomes harder and stronger during flares. The excess x-rays may arise as a result of the time-dependent interaction of an accretion disk with the magnetosphere of the central star. Flares produced by such fluctuations have important implications for the x-wind model of protostellar jets, for the flash-heating of the chondrules found in chondritic meteorites, and for the production of short-lived radioactivities through the bombardment of primitive rocks by solar cosmic rays.

F. Shu is at the Astronomy Department, University of California, Berkeley, CA 94720-3411, USA, and the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 115, Taiwan. H. Shang is in the Astronomy Department, University of California, Berkeley, CA 94720-3411, USA. A. E. Glassgold is in the Physics Department, New York University, New York, NY 10003, USA. T. Lee is at the Institute of Earth Science and the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 115, Taiwan.
*   To whom correspondence should be addressed.

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