Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...471..951f&link_type=abstract
Astronomy and Astrophysics, Volume 471, Issue 3, September I 2007, pp.951-960
Astronomy and Astrophysics
Astrophysics
2
Stars: Activity, Stars: Coronae, Stars: Pre-Main Sequence, Stars: Late-Type, X-Rays: Stars, Open Clusters And Associations: Individual: Taurus-Auriga
Scientific paper
Aims: We investigate the properties of the X-ray emitting plasma of the classical T Tauri star SU Aurigae and of other sources in the field of view. Methods: We use XMM-Newton to obtain a high-resolution RGS spectrum of SU Aur as well as EPIC imaging data and low-resolution spectra of the star and of other X-ray sources in the surrounding field. We reconstruct the emission measure distribution of SU Aur from the RGS spectrum using a line-based method, and we perform multi-temperature fits of the MOS spectra of the strongest sources both for the full observation and for selected time intervals to study their spectral variability. Results: The emission from SU Aur is highly variable, showing three flares during the observation. The MOS spectra indicate a very hot corona, with significant emissivity up to ~40 MK in quiescence, and temperatures up to 140 MK during flares. The emission measure distribution derived from the RGS spectrum peaks at log T = 7.0; any contribution to the X-ray luminosity from cool plasma (T˜ 2 MK) cannot exceed 5% of the total emission. Abundances are ~0.3-0.6 solar with the exception of Mg and Ne that are solar. Spatial analysis of the full EPIC field results in the detection of 104 X-ray sources, 6 of which are associated with the known Taurus-Auriga members in the field of view (including SU Aur). Conclusions: The characteristics of the X-ray emission of SU Aur are very similar to those of young active late-type stars, with a very hot corona and flares, suggesting magnetic activity as the origin of most of the X-ray emission, rather than accretion.
Table 2 is only available in electronic form at http://www.aanda.org
Audard Marc
Franciosini Elena
Pallavicini Roberto
Scelsi Luigi
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