Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..863g&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
UZ Librae is the giant primary of a close binary system with extremely fast rotation and revolution. UZ Librae was observed twice at five months interval in August 2000 and January 2001 by the XMM-Newton space observatory. Serie of lines of highly ionized Fe and several lines of the Ly and He series are visible in the reflection grating spectra most notably from C O and Ne. Bremstrahlung emission from plasma at high temperature (T > 3 107 K) indicates an intense flaring activity on UZ Librae. This is also supported by a Ne abundance enhancement relative to oxygen reminiscent of abundance anomalies observed during stellar and solar flares. We conjecture that the large fluid kinetic helicity induced by the rapid rotation of the star currently generates magnetic fields with two characteristic scales comparable with compact loops within solar active regions and with larger cooler loops interconnecting solar active regions. The X-ray emission of UZ Librae would be strongly enhanced not only due to the occurrence of these magnetic structures but mainly due to their large surface coverage and to their permanent interactions responsible for heating UZ Librae plasma to high temperatures.
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