Coronal emission from the shocked circumstellar ring of SN 1987A

被引：20
|
作者：
Groningsson, P. [1 ]
Fransson, C.
Lundqvist, P.
Nymark, T.
Lundqvist, N.
Chevalier, R.
Leibundgut, B.
Spyromilio, J.
机构：
[1] Stockholm Univ, AlbaNova Ctr, Dept Astron, S-10691 Stockholm, Sweden
[2] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
[3] European So Observ, D-85748 Garching, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2006年 / 456卷 / 02期
关键词：
supernovae : individual : SN 1987A; circumstellar matter; shock waves;
D O I：
10.1051/0004-6361:20065325
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 similar to +/- 350 km s(-1), 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 similar to 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 310-390 km s(-1), corresponding to a shock temperature of ( 1.6-2.5) x 10(6) K. A fraction of the coronal emission may, however, originate in higher velocity adiabatic shocks.
引用
收藏
页码：581 / 589
页数：9
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