EDP Sciences
First Results from XMM-Newton
Free Access
Volume 365, Number 1, January I 2001
First Results from XMM-Newton
Page(s) L318 - L323
DOI https://doi.org/10.1051/0004-6361:20000085
Published online 15 January 2001

A&A 365, L318-L323 (2001)
DOI: 10.1051/0004-6361:20000085

The XMM-Newton view of stellar coronae: Flare heating in the coronae of HR 1099

M. Audard1, M. Güdel1 and R. Mewe2.

1  Paul Scherrer Institut, Würenlingen & Villigen, 5232 Villigen PSI, Switzerland
2  SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands

(Received 2 October 2000 / Accepted 30 October 2000)

The RS CVn system HR 1099 was observed by XMM-Newton for a time span of 25 days during the commissioning phase. Rotational modulation in the RGS light curve has been detected with maximum flux when the active K1 IV star is in front. Following a quiescent phase of emission, the rise and peak of a large flare were observed. Time-dependent spectroscopy has been performed to derive elemental abundances and their variations during the various stages of the flare. Emission measure distributions have been reconstructed. Two different components are detected: a very hot plasma (up to 100 MK) that evolves rapidly, and a stable quiescent plasma. Low first-ionization-potential elemental (such as Fe and Si) abundances increase significantly during the flare, while the abundance of the high-FIP element Ne stays constant at the quiescent value. We report direct detection of a flux increase in the FeXXIV X-ray lines during a stellar flare.

Key words: stars: abundances -stars: activity -stars: coronae -stars: flare -stars: individual: HR 1099 -X-rays: stars

Offprint request: M. Audard, audard@astro.phys.ethz.ch

SIMBAD Objects

© ESO 2001

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.