EDP Sciences
Free access
Issue
A&A
Volume 389, Number 1, July I 2002
Page(s) 228 - 238
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20020529


A&A 389, 228-238 (2002)
DOI: 10.1051/0004-6361:20020529

High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton

A. J. J. Raassen1, 2, R. Mewe1, M. Audard3, M. Güdel3, E. Behar4, J. S. Kaastra1, R. L. J. van der Meer1, C. R. Foley5 and J.-U. Ness6

1  SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2  Astronomical Institute "Anton Pannekoek", Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
3  Paul Scherrer Institut, Würenlingen & Villigen, 5232 Villigen PSI, Switzerland
4  Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
5  Mullard Space Science Laboratory, University College London, Surrey, RH5 6NT, UK
6  Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany

(Received 27 August 2001 / Accepted 5 April 2002 )

Abstract
We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 Å obtained with the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra and with the Reflection Grating Spectrometers (RGS) and the EPIC-MOS CCD spectrometers on board XMM-Newton. Line fluxes have been measured separately for the RGS and LETGS. Spectra have been fitted globally to obtain self-consistent temperatures, emission measures, and abundances. The total volume emission measure is ${\sim} 4.1 \times 10^{50}$ cm -3 with a peak between 1 and 3 MK. No indications for a dominant hot component ( $T \gtrsim 4$ MK) were found. We present additional evidence for the lack of a solar-type FIP-effect, confirming earlier EUVE results.


Key words: stars: individual: Procyon, $\alpha$ Canis Minoris -- stars: coronae -- stars: late-type -- stars: activity -- X-rays: stars

Offprint request: A. J. J. Raassen, a.j.j.raassen@sron.nl




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