Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..868g&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
V390 Aurigae (HD 33798) a rapidly rotating lithium rich late-type giant whose distinctive characteristics include a high X-ray luminosity was observed by the XMM-Newton space observatory. Series of lines of highly ionized Fe and several Lyman lines of hydrogen-like ions and triplet lines of helium-like ions are visible in the reflection grating spectra most notably from O and Ne. X-ray emission from plasma at high temperature (T > 107 K) indicates an intense flaring activity on this star. This is supported by an indication of neon abundance enhancement relative to oxygen reminiscent of abundance anomalies observed during stellar and solar flares. Analysis results suggest a scenario where the corona of V390 Aurigae is dominated by large magnetic structures similar in size to interconnecting loops between solar active regions but significantly hotter. The interaction of these structures themselves could explain the permanent flaring activity on large scales that is responsible for heating V390 Aurigae plasma to high temperatures. We argue that the alpha-Omega dynamo driven activity on V390 Aurigae will disappear in the future with the effect of suppressing large scale magnetic structures in its corona.
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