Issue |
A&A
Volume 456, Number 2, September III 2006
|
|
---|---|---|
Page(s) | 581 - 589 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20065325 | |
Published online | 31 August 2006 |
Coronal emission from the shocked circumstellar ring of SN 1987A
1
Department of Astronomy, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden
2
Department of Astronomy, University of Virginia, PO Box 3818, Charlottesville, VA 22903, USA
3
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany e-mail: per@astro.su.se
Received:
30
March
2006
Accepted:
9
June
2006
High resolution spectra with UVES/VLT of SN 1987A from
December 2000 until November 2005 show a number of high ionization
lines from gas with velocities of ~ , emerging from
the shocked gas formed by the ejecta–ring collision. These include
coronal lines from [Fe X], [Fe XI] and [Fe XIV] which have
increased by a factor of ~ 20 during the observed
period. The evolution of the lines is similar to that of the soft
X-rays, indicating that they arise in the same component. The line
ratios are consistent with those expected from radiative shocks with
velocity
, corresponding to a shock temperature of
K. A fraction of the coronal emission may, however,
originate in higher velocity adiabatic shocks.
Key words: supernovae: individual: SN 1987A / circumstellar matter / shock waves
© ESO, 2006
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