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A&A 365, L318L323 (2001) DOI: 10.1051/0004-6361:20000085

Summary: A&A 365, L318­L323 (2001)
DOI: 10.1051/0004-6361:20000085
c ESO 2001
The XMM-Newton view of stellar coronae:
Flare heating in the coronae of HR 1099
M. Audard1, M. G¨udel1, and R. Mewe2
Paul Scherrer Institut, W¨urenlingen & Villigen, 5232 Villigen PSI, Switzerland
SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Received 2 October 2000 / Accepted 30 October 2000
Abstract. 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.


Source: Audard, Marc - INTEGRAL Science Data Centre & Observatory of Geneva, Université de Genève


Collections: Physics