Coronal emission from the shocked circumstellar ring of SN 1987A
2006 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 456, no 2, 581-589 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 456, no 2, 581-589 p.
supernovae: individual: SN 1987A, circumstellar matter, shock waves
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-86985DOI: 10.1051/0004-6361:20065325ISI: 000240242400018OAI: oai:DiVA.org:kth-86985DiVA: diva2:502896
QC 201203012012-02-142012-02-142012-03-01Bibliographically approved