Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...440..727h&link_type=abstract
Astronomy and Astrophysics, Volume 440, Issue 2, September III 2005, pp.727-734
Astronomy and Astrophysics
Astrophysics
9
Stars: Activity, Stars: Circumstellar Matter, Stars: Individual: Hr 2020, Ultraviolet: Stars, X-Rays: Stars
Scientific paper
β Pictoris (HR 2020) is the most prominent prototype of stars with circumstellar disks and has generated particular interest in the framework of young planetary systems. Given its spectral type A5, stellar activity is not expected. Nevertheless, resonance lines of C iii and O vi typical for a chromosphere and transition region have been unambiguously detected with FUSE. We present results from an XMM-Newton observation of β Pic and find evidence for X-ray emission. In particular, we detected an emission of O vii at 21.6 Å with the MOS detectors. These findings present a challenge for the development of both stellar activity and disk models. We discuss and investigate various models to explain the observed emission including the presence of a cool corona and a boundary layer.
Hempel Maren
Ness Jan-Use
Robrade Jan
Schmitt Juergen H. M. M.
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