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[Untitled]

Authors :
Hsien Shang
Frank H. Shu
Alfred E. Glassgold
Typhoon Lee
Source :
Space Science Reviews. 92:153-176
Publication Year :
2000
Publisher :
Springer Science and Business Media LLC, 2000.

Abstract

We discuss the interaction between the magnetosphere of a young star and its surrounding accretion disk. We consider how an X-wind can be driven magnetocentrifugally from the inner edge of the disk where accreting gas is diverted onto stellar field lines either to flow onto the Sun or to be flung outwards with the wind. The X-wind satisfies many observational tests concerning optical jets, Herbig-Haro objects, and molecular outflows. Connections may exist between primitive solar system materials and X-winds. Chondrules and calcium-aluminum-rich inclusions (CAIs) experienced short melting events uncharacteristic of the asteroid belt where meteorites originate. The inner edge of the solar nebula has the shortest orbital timescale available to the system, a few days. Protosolar flares introduce another timescale, tens of minutes to hours. CAIs may form when solids are lifted from shaded portions of the disk close to the Sun and are exposed to its intense light for a day or so before they are flung by the X-wind to much larger distances. Chondrules were melted, perhaps many times, by flares at larger distances from the Sun before being launched and annealed, but not remelted, in the X-wind. Aerodynamic sorting explains the narrow range of sizes with which CAIs and chondrules are found in chondritic meteorites. Flare-generated cosmic-rays may induce spallation reactions that produce some of the short-lived radioactivities associated with primitive solar system rocks.

Details

ISSN :
00386308
Volume :
92
Database :
OpenAIRE
Journal :
Space Science Reviews
Accession number :
edsair.doi...........8668ac29f6dc5f4af1c61dabf674c1b6
Full Text :
https://doi.org/10.1023/a:1005234909848