Computer Science
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.143f&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Computer Science
1
Solar System And Misc
Scientific paper
To address the role of energetic processes in the solar nebula, we provide a detailed characterization of magnetic flaring in stellar analogs of the pre-main sequence Sun based on two 0.5-day observations of analogs of the young Sun in the Orion Nebula Cluster obtained with the Chandra X-ray Observatory. The sample consists of 41 stars with masses 0.7-1.4 Msolar and ages <1 to ~= 10 Myr. We find the X-ray luminosities are strongly elevated over main sequence levels, and decline during the pre-main sequence phase according to log Lx ~= 29.7 - 0.6(log t - 6), where Lx is in erg s-1 measured in the 2-8 keV band and t is in years. The X-ray emission is strongly variable in time in most solar analogs; about 20 flares with 29 < log Lx(peak) < 31 erg s-1 on timescales from 0.5 to >12 hours are seen during the Chandra observations. The ubiquity of the strong, hard and variable X-ray emission in this sample is strong evidence that the early Sun exhibited similar enhanced magnetic activity. Comparison to the contemporary Sun shows that, at an age of 1 Myr, the Sun exhibited long duration events (LDE) with 102 higher peak X-ray luminosities occurring 102 times more frequently than the most powerful LDE flares seen today. MeV proton fluxes are inferred to have been 105.5 times greater than current levels. The results support a local flare origin of various properties of pristine meteorites. The particles and shocks produced by the magnetic reconnection flares may have flash melted meteoritic chondrules, produced correlated excess 22Ne and particle tracks in free-floating meteoritic grains, and generated at least some of the short-lived nuclides found in CAI inclusions by spallogenic nuclear reactions.
Feigelson Eric
Garmire Gordon
Pravdo Steven
Tsuboi Yohko
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